Analysis of Light-Emission Polarization Ratio in Deep-Ultraviolet Light-Emitting Diodes by Considering Random Alloy Fluctuations with the 3D k·p Method
Journal
Physica Status Solidi - Rapid Research Letters
Journal Volume
16
Journal Issue
2
Date Issued
2022
Author(s)
Abstract
For nitride-based AlGaN light-emitting diodes, the fluctuations in the potential caused by alloy disorder can relax the compressive strain in the lower Al (higher Ga) composition sites. However, strain in the quantum wells impacts the bandgap and the transverse magnetic/transverse electric (TE) polarization ratio. Herein, the 6 × 6 k·p method combined with a 3D Poisson, drift diffusion, and localization landscape solver is used to study the changes in the polarization ratio due to random alloy fluctuations. The influence of different Al compositions in the buffer layer is studied. The results show that the TM polarization ratio with alloy fluctuations is higher than that without fluctuations. On increasing the Al composition in the buffer layer, the polarization ratio changes from 0.93 to ?0.67 when the Al composition changes from 60% to 100%. ? 2021 Wiley-VCH GmbH
Subjects
Aluminum
Aluminum alloys
Aluminum gallium nitride
Buffer layers
Gallium alloys
III-V semiconductors
Polarization
Semiconductor alloys
Semiconductor quantum wells
Al composition
Alloy fluctuation
Deep ultraviolet
K-p method
Lightemitting diode
Polarization ratios
Random alloy
Ultraviolet light emitting diodes
Ultraviolet light-emitting diodes
UVC light-emitting diode
Light emitting diodes
Type
journal article