Journal ArticleACS applied materials & interfaces · April 2023
Thin films of polyfluorene (PFO) were deposited using emulsion-based resonant infrared, matrix-assisted pulsed laser evaporation (RIR-MAPLE). Here, it is shown that properly selected surfactant chemistry in the emulsion can increase crystalline β phase (β- ...
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Journal ArticleSoft matter · March 2023
The morphology of conjugated polymer thin films deposited by the resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) process is related to the emulsion characteristics. However, a fundamental understanding of how and why the emulsion cha ...
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Journal ArticleChemistry of Materials · April 12, 2022
Mixed-halide two-dimensional (2D) hybrid organic-inorganic perovskites offer an important opportunity to control the band gap for applications in optoelectronic devices. This study focuses on phenethylammonium lead halide [(PEA)2Pb(I1-xBrx)4] films, the pu ...
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Journal ArticleJournal of Applied Physics · September 14, 2020
Resonant infrared, matrix-assisted pulsed laser evaporation (RIR-MAPLE) is a promising technique for the physical vapor deposition of hybrid organic-inorganic perovskites. The approach already has been used to deposit both three-dimensional and two-dimensi ...
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Journal ArticleCrystals · March 1, 2020
In this work, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE), a novel deposition technique, was used to produce a transparent composite electrode of polyflourene (PFO) and two-dimensional (2D) Ti3C2Tx nanosheets, which are part of t ...
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Journal ArticleMaterials Horizons · October 1, 2019
Hybrid perovskites incorporating conjugated organic cations enable unusual charge carrier interactions among organic and inorganic structural components, but are difficult to prepare as films due to disparate component chemical/physical characteristics (e. ...
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Journal ArticleJournal of Electronic Materials · May 1, 2019
Emulsion-based, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) was used to deposit thin films of polyfluorene (PFO) with semicrystalline phase domains (β-PFO), which has been performed, previously, only by solution phase processing. ...
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ConferenceProceedings of SPIE - The International Society for Optical Engineering · January 1, 2019
Hybrid organic-inorganic semiconductors, such as hybrid perovskites, are crystalline materials with unique properties derived from the organic or inorganic components. Resonant infrared matrix-assisted pulsed laser evaporation (RIRMAPLE) is a gentle physic ...
Full textCite
Journal ArticleACS Energy Letters · February 9, 2018
Resonant infrared, matrix-assisted pulsed laser evaporation (RIR-MAPLE) is a gentle thin-film deposition technique that combines the facile chemical control of solution processing with the growth control of vapor-phase deposition, yet one that has not been ...
Full textCite
Journal ArticleJournal of Electronic Materials · February 1, 2018
Resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) was used to deposit the metal-halide perovskite (MHP) CH3NH3PbI3 (methylammonium lead triiodide, or MAPbI), creating phase-pure films. Given the moisture sensitivity of these crystallin ...
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ConferenceOptics InfoBase Conference Papers · January 1, 2018
Resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) was used to deposit the metal-halide perovskite (MHP), CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3</inf>, and solar cell performance was demonstrated, thereby establis ...
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Chapter · January 1, 2018
Laser beams are powerful tools for diagnostic purposes and growth of thin films. However, the interaction of lasers with organic or biological materials may result in laser-induced photo-chemical and photo-thermal damage to the materials of interest. In or ...
Full textCite
Journal ArticleApplied Physics Reviews · December 1, 2017
Some of the most exciting materials research in the 21st century attempts to resolve the challenge of simulating, synthesizing, and characterizing new materials with unique properties designed from first principles. Achievements in such development for org ...
Full textCite
Journal ArticleApplied Physics A: Materials Science and Processing · September 1, 2016
Nanoparticles are being explored in many different applications due to the unique properties offered by quantum effects. To broaden the scope of these applications, the deposition of nanoparticles onto substrates in a simple and controlled way is highly de ...
Full textOpen AccessCite
Journal ArticleACS applied materials & interfaces · August 2016
Emulsion-based, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) has been demonstrated as an alternative technique to deposit conjugated polymer films for photovoltaic applications; yet, a fundamental understanding of how the emulsion ...
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Journal ArticleOrganic Electronics · July 1, 2015
Emulsion-based, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) was used to deposit CdSe nanoparticle films and hybrid nanocomposite films comprising colloidal CdSe nanoparticles embedded in a low band gap polymer, poly[2,6-(4,4-bis- ...
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Journal ArticleColloids and surfaces. B, Biointerfaces · February 2015
Antimicrobial oligo (p-phenylene-ethynylene) (OPE) films have previously been demonstrated to show effective ultraviolet A (UVA) light-induced biocidal activity; however, a serious problem arises from the accumulation of dead bacteria and debris on the fil ...
Full textCite
Journal ArticleProceedings of SPIE - The International Society for Optical Engineering · January 1, 2015
Resonant-infrared, matrix-assisted pulsed laser evaporation (RIR-MAPLE) has been used to deposit blended, organic thin-films with nanoscale domain sizes of constituent polymers, small molecules, or colloidal nanoparticles. In the emulsion-based RIR-MAPLE p ...
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Journal ArticleMaterials Research Society Symposium Proceedings · January 1, 2015
Poly (3-hexylthiophene) (P3HT) thin films were deposited using emulsion-based, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) from emulsions containing different solvents and different alcohols, to investigate the impact of emulsion ...
Full textCite
Journal ArticleACS applied materials & interfaces · April 2023
Thin films of polyfluorene (PFO) were deposited using emulsion-based resonant infrared, matrix-assisted pulsed laser evaporation (RIR-MAPLE). Here, it is shown that properly selected surfactant chemistry in the emulsion can increase crystalline β phase (β- ...
Full textCite
Journal ArticleSoft matter · March 2023
The morphology of conjugated polymer thin films deposited by the resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) process is related to the emulsion characteristics. However, a fundamental understanding of how and why the emulsion cha ...
Full textCite
Journal ArticleChemistry of Materials · April 12, 2022
Mixed-halide two-dimensional (2D) hybrid organic-inorganic perovskites offer an important opportunity to control the band gap for applications in optoelectronic devices. This study focuses on phenethylammonium lead halide [(PEA)2Pb(I1-xBrx)4] films, the pu ...
Full textCite
Journal ArticleJournal of Applied Physics · September 14, 2020
Resonant infrared, matrix-assisted pulsed laser evaporation (RIR-MAPLE) is a promising technique for the physical vapor deposition of hybrid organic-inorganic perovskites. The approach already has been used to deposit both three-dimensional and two-dimensi ...
Full textCite
Journal ArticleCrystals · March 1, 2020
In this work, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE), a novel deposition technique, was used to produce a transparent composite electrode of polyflourene (PFO) and two-dimensional (2D) Ti3C2Tx nanosheets, which are part of t ...
Full textCite
Journal ArticleMaterials Horizons · October 1, 2019
Hybrid perovskites incorporating conjugated organic cations enable unusual charge carrier interactions among organic and inorganic structural components, but are difficult to prepare as films due to disparate component chemical/physical characteristics (e. ...
Full textCite
Journal ArticleJournal of Electronic Materials · May 1, 2019
Emulsion-based, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) was used to deposit thin films of polyfluorene (PFO) with semicrystalline phase domains (β-PFO), which has been performed, previously, only by solution phase processing. ...
Full textCite
ConferenceProceedings of SPIE - The International Society for Optical Engineering · January 1, 2019
Hybrid organic-inorganic semiconductors, such as hybrid perovskites, are crystalline materials with unique properties derived from the organic or inorganic components. Resonant infrared matrix-assisted pulsed laser evaporation (RIRMAPLE) is a gentle physic ...
Full textCite
Journal ArticleACS Energy Letters · February 9, 2018
Resonant infrared, matrix-assisted pulsed laser evaporation (RIR-MAPLE) is a gentle thin-film deposition technique that combines the facile chemical control of solution processing with the growth control of vapor-phase deposition, yet one that has not been ...
Full textCite
Journal ArticleJournal of Electronic Materials · February 1, 2018
Resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) was used to deposit the metal-halide perovskite (MHP) CH3NH3PbI3 (methylammonium lead triiodide, or MAPbI), creating phase-pure films. Given the moisture sensitivity of these crystallin ...
Full textCite
ConferenceOptics InfoBase Conference Papers · January 1, 2018
Resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) was used to deposit the metal-halide perovskite (MHP), CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3</inf>, and solar cell performance was demonstrated, thereby establis ...
Full textCite
Chapter · January 1, 2018
Laser beams are powerful tools for diagnostic purposes and growth of thin films. However, the interaction of lasers with organic or biological materials may result in laser-induced photo-chemical and photo-thermal damage to the materials of interest. In or ...
Full textCite
Journal ArticleApplied Physics Reviews · December 1, 2017
Some of the most exciting materials research in the 21st century attempts to resolve the challenge of simulating, synthesizing, and characterizing new materials with unique properties designed from first principles. Achievements in such development for org ...
Full textCite
Journal ArticleApplied Physics A: Materials Science and Processing · September 1, 2016
Nanoparticles are being explored in many different applications due to the unique properties offered by quantum effects. To broaden the scope of these applications, the deposition of nanoparticles onto substrates in a simple and controlled way is highly de ...
Full textOpen AccessCite
Journal ArticleACS applied materials & interfaces · August 2016
Emulsion-based, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) has been demonstrated as an alternative technique to deposit conjugated polymer films for photovoltaic applications; yet, a fundamental understanding of how the emulsion ...
Full textOpen AccessCite
Journal ArticleOrganic Electronics · July 1, 2015
Emulsion-based, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) was used to deposit CdSe nanoparticle films and hybrid nanocomposite films comprising colloidal CdSe nanoparticles embedded in a low band gap polymer, poly[2,6-(4,4-bis- ...
Full textCite
Journal ArticleColloids and surfaces. B, Biointerfaces · February 2015
Antimicrobial oligo (p-phenylene-ethynylene) (OPE) films have previously been demonstrated to show effective ultraviolet A (UVA) light-induced biocidal activity; however, a serious problem arises from the accumulation of dead bacteria and debris on the fil ...
Full textCite
Journal ArticleProceedings of SPIE - The International Society for Optical Engineering · January 1, 2015
Resonant-infrared, matrix-assisted pulsed laser evaporation (RIR-MAPLE) has been used to deposit blended, organic thin-films with nanoscale domain sizes of constituent polymers, small molecules, or colloidal nanoparticles. In the emulsion-based RIR-MAPLE p ...
Full textCite
Journal ArticleMaterials Research Society Symposium Proceedings · January 1, 2015
Poly (3-hexylthiophene) (P3HT) thin films were deposited using emulsion-based, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) from emulsions containing different solvents and different alcohols, to investigate the impact of emulsion ...
Full textCite
Journal ArticleJournal of materials chemistry. B · July 2014
Multifunctional films with both antimicrobial activity and fouling-release ability based on a biocidal quaternary ammonium salt (QAS) and thermo-responsive poly(N-isopropylacrylamide) (PNIPAAm) were deposited on substrates using resonant infrared, matrix-a ...
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Journal ArticleApplied Physics Letters · June 2, 2014
Organic solar cells based on poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) and [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) were fabricated by emulsion-based, resonant in ...
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Journal ArticleColloids and surfaces. B, Biointerfaces · April 2014
The antimicrobial oligomer, oligo(p-phenylene-ethynylene) (OPE), was deposited as thin films by resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) on solid substrates and exhibited light-induced biocidal activity. The biocidal activity ...
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Journal ArticleMacromolecular Chemistry and Physics · December 1, 2013
Anti-reflection (AR) coatings designed for glass and other rigid, inorganic substrates are commercially available; however, these inorganic AR coatings tend to crack or delaminate on flexible substrates. A polymeric film with a gradient refractive index (G ...
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Journal ArticleJournal of Electronic Materials · May 1, 2013
Colloidal quantum dots (CQDs) are chemically synthesized semiconductor nanoparticles with size-dependent wavelength tunability. Chemical synthesis of CQDs involves the attachment of long organic surface ligands to prevent aggregation; however, these ligand ...
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Journal ArticleAIP Conference Proceedings · December 1, 2012
Resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) is a variation of pulsed laser deposition that is useful for organic-based thin films because it reduces material degradation by selective absorption of infrared radiation in the host m ...
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Journal ArticleColloid and Polymer Science · October 1, 2012
Colloidal quantum dots (CQDs) can easily become aggregated when blended in a polymer matrix. Although several techniques have been reported to prepare dispersed CQDs in a polymer matrix, the novel approach of this work is to obtain well-dispersed CQD-polym ...
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Journal ArticlePolymers · June 8, 2012
The molecular weight of a polymer determines key optoelectronic device characteristics, such as internal morphology and charge transport. Therefore, it is important to ensure that polymer deposition techniques do not significantly alter the native polymer ...
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Journal ArticleProceedings of SPIE - The International Society for Optical Engineering · March 23, 2012
Graded index polymer films enable novel optics using rigid or flexible substrates, such as waveguides or anti-reflection coatings. Previously, such films have been fabricated by nanoimprint lithography or the decomposition of a single component in polymer ...
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Journal ArticleInternational Journal of High Speed Electronics and Systems · March 1, 2012
Hybrid nanocomposite thin films, composed of inorganic colloidal quantum dots (CQDs) embedded in a matrix of organic conjugated polymer, have shown promise as a method for room-temperature infrared detection due to the three-dimensional confinement of the ...
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Journal ArticleCrystals · January 16, 2012
This article investigates hole transport in poly[2-methoxy-5-(2'-ethyl-hexyloxy)- 1,4-phenylene vinylene] (MEH-PPV)/CdSe colloidal quantum dot (CQD) nanocomposites using a modified time-of-flight photoconductivity technique. The measured hole drift mobilit ...
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Journal ArticleApplied Physics A: Materials Science and Processing · November 1, 2011
Resonant-infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) is a promising deposition technology for the fabrication of conjugated polymer-based optoelectronic devices for two primary reasons: (i) the ability to control film morphology, and (ii) ...
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Journal ArticleIEEE Journal of Quantum Electronics · October 13, 2011
Hybrid nanocomposite thin films composed of inorganic colloidal quantum dots (CQDs) embedded in an organic conjugated polymer have shown promise as a method for room-temperature infrared detection due to the 3-D confinement of the CQD. The CQDs are coated ...
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Chapter · January 1, 2011
In this chapter, the device physics of quantum-dot infrared photodetectors (QDIPs) is reviewed, including epitaxial growth of quantum-dot (QD)-active regions, intraband transitions in QDs, and infrared photodetector performance parameters. Current QDIP res ...
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Journal ArticleAIP Conference Proceedings · November 29, 2010
In this research, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) has been used to deposit different classes of inorganic nanoparticles, including bare, un-encapsulated ZnO and Au nanoparticles, as well as ligand-encapsulated CdSe co ...
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Journal ArticleProceedings of SPIE - The International Society for Optical Engineering · May 7, 2010
We report direct measurement of spectrally selective absorption properties of PbSe and PbS colloidal quantum dots (CQDs) in Si nanomembrane photonic crystal cavities on flexible polyethylene terephthalate (PET) substrates. Enhanced optical absorption was o ...
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Journal ArticleApplied Physics Letters · February 2010
We report here modified absorption property of colloidal quantum dots (CQDs) inside flexible Fano filters-made of patterned single crystalline silicon nanomembrane transferred onto flexible plastic substrates. Enhanced optical absorption was obtained both ...
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Journal ArticleMaterials Research Society Symposium Proceedings · December 1, 2009
CdSe colloidal quantum dot (CQD)/poly[2-methoxy-5-(2-ethylhexyloxy)-1,4- phenylenevinylene] (MEH-PPV) nanocomposite thin films were deposited onto ITO-coated glass and carbon grids using two techniques (simultaneous and sequential deposition) of matrix-ass ...
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Journal Article2009 9th IEEE Conference on Nanotechnology, IEEE NANO 2009 · December 1, 2009
Quantum dot infrared photodetectors (QDIPs) are positioned to become an important technology in the field of infrared (IR) detection, particularly for high-temperature, low-cost, high-yield detector arrays required for military applications. By addressing ...
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Journal ArticleJournal of Physics D: Applied Physics · November 2009
A unique and distinct approach to unipolar, intraband transitions appropriate for room-temperature, mid- and long-wave-infrared (IR) photodetection is to use active regions comprising colloidal quantum dots (CQDs) synthesized by inorganic chemistry embedde ...
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Journal ArticleThin Solid Films · October 30, 2009
CdSe colloidal quantum dot / poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-(1-cyano vinylene)phenylene] hybrid nanocomposite thin films were deposited using resonant infrared matrix-assisted pulsed laser evaporation. The distributions of CdSe colloidal quantum d ...
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Journal ArticleJournal of Vacuum Science and Technology B · October 2009
The effects of various deposition techniques on the photoluminescence spectra of the conjugated polymer poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-(1-cyanovinylene) phenylene] (MEH-CN-PPV) are investigated. Photoluminescence spectroscopy provides insight to t ...
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Journal ArticleChemical Physics Letters · August 6, 2009
Poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-(1-cyanovinylene)-phenylene] (MEH-CN-PPV) thin films were deposited using resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) from targets comprising differing ratios of phenol to ice to assess the ...
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Journal ArticleJournal of Nanophotonics · January 1, 2009
Quantum-dot infrared photodetectors (QDIPs) are positioned to become an important technology in the field of infrared (IR) detection, particularly for high-temperature, low-cost, high-yield detector arrays required for military applications. High-operating ...
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Journal ArticleIEEE Journal on Selected Topics in Quantum Electronics · July 1, 2008
Structural optimization of light-emitting polymer, or organic semiconductor, thin films deposited by tabletop 2.9 μm resonant infrared matrix-assisted pulsed evaporation (RIR-MAPLE) is investigated. Surface morphology of poly[2-methoxy-5-(2′-ethylhexyloxy) ...
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Journal ArticleJournal of Applied Physics · June 9, 2008
We have previously demonstrated a method for achieving room-temperature, intraband, midinfrared (3-5 μm) absorption in CdSe colloidal quantum dotpoly[2-methoxy-5-(2′ -ethylhexyloxy)-1,4- phenylenevinylene] conducting polymer nanocomposites deposited on GaA ...
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Journal ArticleApplied Physics Letters · March 14, 2008
In order to better understand dopant incorporation in quantum dot infrared photodetectors, the application of cross-sectional scanning capacitance microscopy (SCM) has been used to investigate carrier occupation/distribution in a multilayer InAsGaAs quantu ...
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Journal ArticleMaterials Research Society Symposium Proceedings · January 1, 2008
The drop-casting of hybrid nanocomposite thin films results in lack of control over film thickness and nanoparticle distribution, thereby posing a serious challenge to achieving high performance infrared photodetectors. In this work, hybrid nanocomposite d ...
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Journal ArticleICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics, Congress Proceedings · January 1, 2008
We report our work on nanophotonic devices and the associated fabrication processes, mostly based on the top-down and bottom-up integration of photonic crystal on silicon and other foreign substrates. Encapsulated photonic crystals were proposed based on t ...
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Journal ArticleConference on Lasers and Electro-Optics, 2007, CLEO 2007 · December 1, 2007
Impurity centers induced by dopants in InAs/GaAs quantum-dot systems affect energy level occupation and carrier transport in multi-layer QDIPs. In order to better understand doping effects and to optimize device performance, capacitance-voltage spectra are ...
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Journal ArticleConference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series · December 1, 2007
Impurity centers induced by dopants in InAs/GaAs quantum-dot systems affect energy level occupation and carrier transport in multi-layer QDIPs. In order to better understand doping effects and to optimize device performance, capacitance-voltage spectra are ...
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Journal ArticleConference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS · December 1, 2007
Cross-section of multi-layer InAs/GaAs quantum dot heterostructure has been characterized using scanning capacitance microscopy to investigate dopant incorporation into quantum dots. Simulation of the corresponding band structure is used to better understa ...
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Journal ArticleInfrared Physics and Technology · October 1, 2007
In order to improve spectral response tunability of quantum-dot infrared photodetectors (QDIPs), it is critical to understand how dopants are incorporated into quantum dots (QDs). In this letter, polarization-dependent Fourier transform infrared spectrosco ...
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Journal ArticleApplied Physics Letters · June 28, 2007
In order to understand dopant incorporation in quantum dot infrared photodetectors, three quantum dot (QD) Schottky diodes (undoped, delta doped, and modulation doped) have been investigated. Donor-complex-defect (DX) centers have been observed by photocap ...
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Journal ArticleJournal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures · June 11, 2007
In order to decrease dark current density and improve spectral response tunability of quantum dot infrared photodetectors (QDIPs), it is critical to understand how dopants are incorporated into quantum dot active regions. In this article, polarization-depe ...
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Journal ArticleInternational Journal of High Speed Electronics and Systems · March 1, 2007
Quantum dot infrared photodetectors (QDIPs) using quantum dots (QDs) grown by strained-layer epitaxy have demonstrated low dark current, multi-spectral response, high operating temperature, and infrared (IR) imaging. However, achieving near room-temperatur ...
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Journal ArticleOptics InfoBase Conference Papers · January 1, 2007
Impurity centers induced by dopants in InAs/GaAs quantum-dot systems affect energy level occupation and carrier transport in multi-layer QDIPs. In order to better understand doping effects and to optimize device performance, capacitance-voltage spectra are ...
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Journal ArticleOptics InfoBase Conference Papers · January 1, 2007
Impurity centers induced by dopants in InAs/GaAs quantum-dot systems affect energy level occupation and carrier transport in multi-layer QDIPs. In order to better understand doping effects and to optimize device performance, capacitance-voltage spectra are ...
Cite
Journal ArticleOptics InfoBase Conference Papers · January 1, 2007
Impurity centers induced by dopants in InAs/GaAs quantum-dot systems affect energy level occupation and carrier transport in multi-layer QDIPs. In order to better understand doping effects and to optimize device performance, capacitance-voltage spectra are ...
Cite
Journal ArticleMaterials Research Society Symposium Proceedings · January 1, 2007
In this paper we investigate the optical properties of four CdSe colloidal quantum dot/conducting polymer nanocomposites deposited on GaAs substrates using photoluminescence and Fourier transform infrared absorbance. The purpose of this investigation is to ...
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Journal ArticleElectrochemical Society Interface · December 1, 2006
Both wet and dry semiconductor quantum dots (SQD) will be effectively incorporated into optoelectronic devices to improve performance and enable higher efficiency photodetectors and emitters. These nanoscale materials have electronic and optical properties ...
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Journal ArticleConference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006 · December 1, 2006
To reduce dark current in quantum-dot infrared photodetectors, different InAs/GaAs quantum-dot doping conditions, i.e. concentration and modulation- vs. delta-doping, have been investigated by the comparison of temperature-dependent dark current and corres ...
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Journal ArticleMaterials Research Society Symposium Proceedings · January 1, 2006
The motivation and distinct approach for this work is the use of intraband transitions within colloidal quantum dots for the detection of mid- (3-5 μm) and/or long-wave (8-14 μm) infrared light. The CdSe colloidal quantum dot/MEH-PPV conducting polymer nan ...
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Journal ArticleJournal of Physics D: Applied Physics · July 7, 2005
Quantum dot infrared photodetectors (QDIPs) have emerged as attractive devices for sensing long wavelength radiation. Their principle of operation is based on intersublevel transitions in quantum dots (QDs). Three-dimensional quantum confinement offers the ...
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Journal ArticleLaser Focus World · May 1, 2005
The challenges faced by the quantum-dot IR photodetectors (QDIP), which are well-suited for detecting mid-IR light at elevated temperatures, are discussed. The quantum-mechanical nature of the QD for IR photodetectors allows normal-incidence detection, lar ...
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Journal ArticleDevice Research Conference - Conference Digest, DRC · December 1, 2004
The reduction of dark current in quantum dot (QD) infrared photodetectors (QDIP), which uses resonant tunneling (RT) barriers to selectively block dark current while transmitting photocurrent, was investigated. A heterostructure design for such a RT-QDIP c ...
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Journal ArticleAnnual Review of Materials Research · September 6, 2004
Highly strained semiconductors grow epitaxially on mismatched substrates in the Stranski-Krastanow growth mode, wherein islands are formed after a few monolayers of layer-by-layer growth. Elastic relaxation on the facet edges, renormalization of the surfac ...
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Journal ArticleElectronics Letters · August 19, 2004
A novel quantum dot infrared photodeteotor design, based on double-barrier resonant tunnelling, is proposed and demonstrated. Theoretical calculations predict significantly lower dark currents in this device, compared to conventional quantum dot photodetec ...
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Journal ArticleIEEE Photonics Technology Letters · May 1, 2004
We have optimized the growth of multiple (40-70) layers of self-organized InAs quantum dots separated by GaAs barrier layers in order to enhance the absorption of quantum-dot infrared photodetectors (QDIPs). In devices with 70 quantum-dot layers, at relati ...
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Journal ArticleIEEE Photonics Technology Letters · March 1, 2004
A model for the dark current in quantum dot infrared photodetectors, including thermionic emission and field-assisted tunneling, is developed. The calculated dark currents are in excellent agreement with measured values for a wide range of temperatures (78 ...
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Journal ArticleElectronics Letters · February 5, 2004
The characteristics of quantum dot infrared photodetectors (QDIPs) in which InAs self-organised quantum dots are embedded in an AlAs/GaAs superlattice matrix are reported. An extremely large peak responsivity, R p =2.5 A/W, is measured at T= 78K for Vvias ...
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Journal ArticleConference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS · December 9, 2003
Quantum dot infrared photodetectors (QDIPs) offer normal-incidence sensitivity, low dark current, high-temperature operation, and multi-wavelength detection. In general, the advantages of these intersubband devices are the result of three-dimensional quant ...
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Journal ArticleInstitute of Physics Conference Series · December 1, 2003
The unique hot-carrier dynamics and intersubband transitions in quantum dots play important roles in defining the device characteristics for mid- and far-infrared sources and detectors. The properties of these devices are described and discussed. ...
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Journal ArticleJournal of Applied Physics · October 15, 2003
Influence of rapid thermal annealing on a 30 stack InAs/GaAs quantum dot infrared photodetector (QDIP) was studied. Temperatures in the range of 600-800°C for 60 s, typical of atomic interdiffusion were used. The devices exhibited large dark currents after ...
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Journal ArticleJournal of Physics D: Applied Physics · August 7, 2003
We have studied the characteristics of intersubband absorption of polarized infrared (IR) radiation in as-grown and annealed self-organized InAs/GaAs quantum dots. It is observed that with the increase of annealing time and temperature, the dots tend to fl ...
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Journal ArticleIEEE Journal of Quantum Electronics · March 1, 2003
Quantum-dot infrared photodetectors (QDIPs) are being studied extensively for mid-wavelength and long-wavelength infrared detection because they offer normal-incidence, high-temperature, multispectral operation. Intersubband absorption, carrier lifetime, a ...
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ConferenceOptics InfoBase Conference Papers · January 1, 2003
Excellent material and optical quality of a 70-layer quantum dot infrared photodetector has enabled high responsivity detection and polarization-sensitive absorption. ...
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Journal ArticleOSA Trends in Optics and Photonics Series · January 1, 2003
The material characteristics of 70-layer quandom dot infrared photodetector (QDIP) was investigated using transmission electron microscopy and photoluminescence measurements. QDIP comprises of InAs/GaAs quantum dots, which offers nornal incidence, low dark ...
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Journal ArticleOSA Trends in Optics and Photonics Series · January 1, 2003
We experimentally observed for the first time two-photon detection in a quantum dot mid-infrared photodetector. We use a 100-fs difference frequency generator tuned in the 2-5 micron range. The photodetector is suitable for second-order autocorrelation mea ...
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Journal ArticleInternational Journal of High Speed Electronics and Systems · December 1, 2002
InAs/GaAs quantum dot devices have the potential to be the leading technology for infrared detection and emission, which are necessary for many military and domestic applications. Quantum dot infrared photodetectors yield higher operating temperatures, low ...
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Journal ArticleApplied Physics Letters · May 6, 2002
We demonstrate normal incidence infrared imaging with quantum dot infrared photodetectors using a raster-scan technique. The device heterostructure, containing multiple layers of InAs/GaAs self-organized quantum dots, were grown by molecular-beam epitaxy. ...
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Journal ArticleJournal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures · May 1, 2002
The properties of a low-bias and high-temperature InAs/GaAs vertical quantum-dot infrared photodetector (QDIP) with a single Al0.3Ga0.7As current-blocking barrier were investigated. This device demonstrated high peak detectivity and a high operating temper ...
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Journal ArticleIEEE Circuits and Devices Magazine · January 1, 2002
The properties of normal-incidence, high-temperature, mid-wavelength IR, InAs/GaAs vertical QDIPs with and without an Al 0.3Ga 0.7As current-blocking barrier are discussed. These devices demonstrate very high D* values (D* ∼3 × 10 9 cmHz 1/2/W at T = 100 K ...
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Journal ArticleProceedings of SPIE-The International Society for Optical Engineering · January 1, 2002
Mid-and far-infrared detectors operating at elevated temperatures (T > 150 K) are critical for imaging applications. In(Ga)As/GaAs quantum dots, grown by self-organized epitaxy, are an important material for the design and fabrication of high-temperature i ...
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Journal ArticleMaterials Research Society Symposium - Proceedings · January 1, 2002
Long-wavelength infrared detectors operating at elevated temperatures are critical for imaging applications. InAs/GaAs quantum dots are an important material for the design and fabrication of high-temperature infrared photodetectors. Quantum dot infrared p ...
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Journal ArticleConference on Optoelectronic and Microelectronic Materials and Devices, Proceedings, COMMAD · January 1, 2002
In this paper the effect of rapid thermal annealing (RTA) on a 30 stacked InAs/GaAs, molecular beam epitaxially grown quantum dot infrared detector (QDIP) device is studied. Temperatures in the range of 700 - 900°C for 60s, typical of ion implantation indu ...
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Journal ArticleIEEE Journal of Quantum Electronics · November 1, 2001
The growth, fabrication, and characterization of a normal-incidence, high-temperature, mid-wavelength infrared, InAs - GaAs vertical quantum-dot infrared photodetector with a single Al0.3Ga0.7As current-blocking barrier are described and discussed in detai ...
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Journal ArticleApplied Physics Letters · July 16, 2001
A mid-infrared normal-incidence InAs/GaAs quantum-dot detector containing Al0.3Ga0.7As with peak responsivity and a very high peak detectivity was studied. The detectors were grown, fabricated and characterized in the temperature range of 78 to 150 K. The ...
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Journal ArticleConference on Optical Fiber Communication, Technical Digest Series · January 1, 2001
We propose and demonstrate a wavelength-division-multiplexed network in which one wavelength is used for broadcast signals, while other wavelengths are used for switched signals. A novel device-the Bragg tap-is demonstrated. ...
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Journal ArticleAnnual Device Research Conference Digest · January 1, 2001
State-of-the-art results on vertical and lateral mid-infrared intersubband quantum dot infrared photodetectors (QDIP) was presented. The vertical detectors exhibited lowest dark currents for such devices and also had one of the highest operating temperatur ...
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Through the use of aromatic solvents with varying numbers of hydroxyl and methyl moieties, there is an opportunity to positively impact morphology of polymer films deposited through emulsion-based Resonant-Infrared Matrix-Assisted Pulsed Laser Evaporation ...
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