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Suppression of Surface Defects and Vibrational Coupling in GaN by a Graphene Monolayer

Publication ,  Journal Article
Zheng, C; Ning, J; Ye, H; Zhang, L; Xu, K; Zhao, D; Ni, Z; Wang, J; Xu, S
Published in: Physica Status Solidi - Rapid Research Letters
February 1, 2022

The optical transitions and random walking dynamics of the three types of excitons, namely, free, donor-bound, and acceptor-like surface-defect-bound excitons, in both the graphene−GaN hybrid structure and bare GaN are comparatively examined using variable-temperature steady-state photoluminescence and time-resolved photoluminescence. The results reveal that the effective suppression of surface defects may be realized by a graphene capping monolayer, evidenced by the strong reduction of the luminescence signal of the surface-defect-bound excitons and the simultaneous enhancement of the free exciton luminescence. More interestingly, the coupling strengths between all the three kinds of excitons and the longitudinal optical phonons tend to weaken, especially for the surface-defect-bound excitons, which exhibit a reduction of ≈40%. These findings indicate that capping GaN by graphene could be an effective way to passivate harmful surface defects and address the heating problem in GaN-based devices.

Duke Scholars

Published In

Physica Status Solidi - Rapid Research Letters

DOI

EISSN

1862-6270

ISSN

1862-6254

Publication Date

February 1, 2022

Volume

16

Issue

2

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 1007 Nanotechnology
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics
 

Citation

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Zheng, C., Ning, J., Ye, H., Zhang, L., Xu, K., Zhao, D., … Xu, S. (2022). Suppression of Surface Defects and Vibrational Coupling in GaN by a Graphene Monolayer. Physica Status Solidi - Rapid Research Letters, 16(2). https://doi.org/10.1002/pssr.202100489
Zheng, C., J. Ning, H. Ye, L. Zhang, K. Xu, D. Zhao, Z. Ni, J. Wang, and S. Xu. “Suppression of Surface Defects and Vibrational Coupling in GaN by a Graphene Monolayer.” Physica Status Solidi - Rapid Research Letters 16, no. 2 (February 1, 2022). https://doi.org/10.1002/pssr.202100489.
Zheng C, Ning J, Ye H, Zhang L, Xu K, Zhao D, et al. Suppression of Surface Defects and Vibrational Coupling in GaN by a Graphene Monolayer. Physica Status Solidi - Rapid Research Letters. 2022 Feb 1;16(2).
Zheng, C., et al. “Suppression of Surface Defects and Vibrational Coupling in GaN by a Graphene Monolayer.” Physica Status Solidi - Rapid Research Letters, vol. 16, no. 2, Feb. 2022. Scopus, doi:10.1002/pssr.202100489.
Zheng C, Ning J, Ye H, Zhang L, Xu K, Zhao D, Ni Z, Wang J, Xu S. Suppression of Surface Defects and Vibrational Coupling in GaN by a Graphene Monolayer. Physica Status Solidi - Rapid Research Letters. 2022 Feb 1;16(2).
Journal cover image

Published In

Physica Status Solidi - Rapid Research Letters

DOI

EISSN

1862-6270

ISSN

1862-6254

Publication Date

February 1, 2022

Volume

16

Issue

2

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 1007 Nanotechnology
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics