Efficiency droop in GaN LEDs at high injection levels: Role of hydrogen
- Authors: Bochkareva N.I.1, Sheremet I.A.2, Shreter Y.G.1
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Affiliations:
- Ioffe Physical–Technical Institute
- Financial University under the Government of the Russian Federation
- Issue: Vol 50, No 10 (2016)
- Pages: 1369-1376
- Section: Physics of Semiconductor Devices
- URL: https://journals.rcsi.science/1063-7826/article/view/198102
- DOI: https://doi.org/10.1134/S1063782616100109
- ID: 198102
Cite item
Abstract
Point defects in GaN and, in particular, their manifestation in the photoluminescence, optical absorption, and recombination current in light-emitting diodes with InGaN/GaN quantum wells are analyzed. The results of this analysis demonstrate that the wide tail of defect states in the band gap of GaN facilitates the trap-assisted tunneling of thermally activated carriers into the quantum well, but simultaneously leads to a decrease in the nonradiative-recombination lifetime and to an efficiency droop as the quasi-Fermi levels intersect the defect states with increasing forward bias. The results reveal the dominant role of hydrogen in the recombination activity of defects with dangling bonds and in the efficiency of GaN-based devices.
About the authors
N. I. Bochkareva
Ioffe Physical–Technical Institute
Email: y.shreter@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021
I. A. Sheremet
Financial University under the Government of the Russian Federation
Email: y.shreter@mail.ioffe.ru
Russian Federation, Moscow, 125993
Yu. G. Shreter
Ioffe Physical–Technical Institute
Author for correspondence.
Email: y.shreter@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021