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Calculation of intraband absorption coefficients in organic/inorganic nanocomposites: Effects of colloidal quantum dot surface ligand and dot size

Publication ,  Journal Article
Lantz, KR; Stiff-Roberts, AD
Published in: IEEE 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 with a surface ligand material which is comprised of short, organic molecules that prevent the CQDs from aggregating when placed in solution. These surface ligand materials behave as a thin, insulating layer that has been shown to prevent efficient transfer of excited carriers into and out of the CQD. Therefore, it is important to understand the effect that the surface ligand material has on the optical properties of the nanocomposite materials in order to design more efficient hybrid nanocomposite optoelectronic devices. In this paper, we calculate the infrared, intraband absorption coefficient for CQDs in a nanocomposite thin film. The model is verified by comparing the calculated absorption coefficient spectrum to a measured FTIR absorbance spectrum for a specific hybrid nanocomposite material system. Importantly, the CQD surface ligand is included in the model explicitly, which enables the selection of the surface ligand material to be considered as a design parameter for infrared, intraband absorption in hybrid nanocomposites. In addition, the CQD average size is also treated as design parameter in order to tune the infrared, intraband absorption coefficient in hybrid nanocomposites. © 2011 IEEE.

Duke Scholars

Published In

IEEE Journal of Quantum Electronics

DOI

ISSN

0018-9197

Publication Date

October 13, 2011

Volume

47

Issue

11

Start / End Page

1420 / 1427

Related Subject Headings

  • Optoelectronics & Photonics
  • 5108 Quantum physics
  • 5102 Atomic, molecular and optical physics
  • 4009 Electronics, sensors and digital hardware
  • 0912 Materials Engineering
  • 0906 Electrical and Electronic Engineering
  • 0205 Optical Physics
 

Citation

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Lantz, K. R., & Stiff-Roberts, A. D. (2011). Calculation of intraband absorption coefficients in organic/inorganic nanocomposites: Effects of colloidal quantum dot surface ligand and dot size. IEEE Journal of Quantum Electronics, 47(11), 1420–1427. https://doi.org/10.1109/JQE.2011.2169235
Lantz, K. R., and A. D. Stiff-Roberts. “Calculation of intraband absorption coefficients in organic/inorganic nanocomposites: Effects of colloidal quantum dot surface ligand and dot size.” IEEE Journal of Quantum Electronics 47, no. 11 (October 13, 2011): 1420–27. https://doi.org/10.1109/JQE.2011.2169235.
Lantz, K. R., and A. D. Stiff-Roberts. “Calculation of intraband absorption coefficients in organic/inorganic nanocomposites: Effects of colloidal quantum dot surface ligand and dot size.” IEEE Journal of Quantum Electronics, vol. 47, no. 11, Oct. 2011, pp. 1420–27. Scopus, doi:10.1109/JQE.2011.2169235.
Lantz KR, Stiff-Roberts AD. Calculation of intraband absorption coefficients in organic/inorganic nanocomposites: Effects of colloidal quantum dot surface ligand and dot size. IEEE Journal of Quantum Electronics. 2011 Oct 13;47(11):1420–1427.

Published In

IEEE Journal of Quantum Electronics

DOI

ISSN

0018-9197

Publication Date

October 13, 2011

Volume

47

Issue

11

Start / End Page

1420 / 1427

Related Subject Headings

  • Optoelectronics & Photonics
  • 5108 Quantum physics
  • 5102 Atomic, molecular and optical physics
  • 4009 Electronics, sensors and digital hardware
  • 0912 Materials Engineering
  • 0906 Electrical and Electronic Engineering
  • 0205 Optical Physics