期刊
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
卷 81, 期 1, 页码 45-48出版社
KOREAN PHYSICAL SOC
DOI: 10.1007/s40042-022-00489-9
关键词
Optical polarization; GaN; InGaN; Strain relaxation; Quantum well; Light-emitting diodes
资金
- Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2021M3D1A2048623]
- National Research Foundation of Korea [2021M3D1A2048623] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The in-plane polarization characteristics of nonpolar (11 (2) over bar0) InxGa1-xN/GaN (x = 0.2) quantum-well (QW) structures change as the In content in the InGaN substrate increases. The topmost valence subband shifts from Y' >-like to Z' >-like states. The in-plane optical anisotropy becomes smaller for QW structures with higher substrate In content because both x'- and y' -polarized emission peaks are similar to each other.
The in-plane polarization characteristics of nonpolar (11 (2) over bar0) InxGa1-xN/GaN (x = 0.2) quantum-well (QW) structures are investigated as a function of In content in InyGa1-yN substrates by using the multiband effective-mass theory. States constituting the topmost valence subband change from vertical bar Y' >-like to vertical bar Z' >-like as the In content in the InGaN substrate increases. In the case of the QW structure grown on a conventional GaN substrate (y = 0.0), the y'-polarized matrix element is much larger than the x'-polarized matrix element. However, the y'-polarized matrix element rapidly decreases with increasing y content in the InGaN substrate and becomes similar to the x'-polarized matrix element. As a result, the magnitude of the in-plane optical anisotropy becomes smaller for QW structures with higher substrate In content because both x'- and y' -polarized emission peaks are similar to each other.
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