https://scholars.lib.ntu.edu.tw/handle/123456789/607379
Title: | Three-Dimensional Modeling of Minority-Carrier Lateral Diffusion Length including Random Alloy Fluctuations in (In, Ga) N and (Al, Ga) N Single Quantum Wells | Authors: | Shen H.-T Weisbuch C Speck J.S Wu Y.-R. YUH-RENN WU |
Keywords: | Charge carriers;Diffusion;Electric fields;Light emitting diodes;Nitrides;Carrier diffusion length;Driftdiffusion equations;Full three-dimensional;Internal electric fields;Minority carrier diffusion length;Non-radiative recombinations;Potential fluctuations;Three-dimensional model;Semiconductor quantum wells | Issue Date: | 2021 | Journal Volume: | 16 | Journal Issue: | 2 | Source: | Physical Review Applied | Abstract: | For nitride-based (In,Ga)N and (Al,Ga)N quantum-well (QW) light-emitting diodes (LEDs), the potential fluctuations caused by natural alloy disorders limit the lateral intra-QW carrier diffusion length and current spreading. The diffusion length mainly impacts the overall LED efficiency through sidewall nonradiative recombination, especially for μLEDs. In this paper, we study the carrier lateral diffusion length for nitride-based green, blue, and ultraviolet C (UVC) QWs in three dimensions. We solve the Poisson and drift-diffusion equations in the framework of localization landscape theory. The full three-dimensional model includes the effects of random alloy composition fluctuations and electric fields in the QWs. The dependence of the minority carrier diffusion length on the majority carrier density is studied with a full three-dimensional model. The results show that the diffusion length is limited by the potential fluctuations and the recombination rate, the latter being controlled by the spontaneous and piezoelectric fields in the QWs and by the screening of the internal electric fields by carriers. ? 2021 American Physical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85114388104&doi=10.1103%2fPhysRevApplied.16.024054&partnerID=40&md5=cd514872114889b26b2ff45a6716658a https://scholars.lib.ntu.edu.tw/handle/123456789/607379 |
ISSN: | 23317019 | DOI: | 10.1103/PhysRevApplied.16.024054 |
Appears in Collections: | 電機工程學系 |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.