https://scholars.lib.ntu.edu.tw/handle/123456789/632076
標題: | A 3D simulation comparison of carrier transport in green and blue c-plane multi-quantum well nitride light emitting diodes | 作者: | Lheureux G Lynsky C YUH-RENN WU Speck J.S Weisbuch C. |
公開日期: | 2020 | 卷: | 128 | 期: | 23 | 來源出版物: | Journal of Applied Physics | 摘要: | Until recently, the electrical efficiency of green nitride light-emitting diodes (LEDs) was considerably lower than that of blue LEDs. This is particularly surprising as one would expect a reduced forward voltage with increasing emission wavelength. In this paper, we theoretically investigated the impact of the number of quantum wells on the forward voltage of III-nitride LEDs with x = 0.15 (blue) and x = 0.24 (green) InxGa1-xN QWs. The simulated dependence of current density (J) on applied diode bias (V) shows a significant increase of 1.9 V in the forward voltage between one and five quantum well (QW) c-plane green LED structures. Artificially turning off the polarization fields in the simulation does not entirely suppress this effect. Due to the large band offsets in the green LED multiple QW (MQW) stack, simulations indicate a sequential band filling of the QW sequence. This mechanism should not be limited to c-plane LEDs and could also be present in nonpolar or semipolar devices. © 2020 American Institute of Physics Inc.. All rights reserved. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85115864309&partnerID=40&md5=9da96001838470fee69422d056ee30ac https://scholars.lib.ntu.edu.tw/handle/123456789/632076 |
ISSN: | 00218979 | SDG/關鍵字: | Gallium alloys; Indium alloys; Light emitting diodes; Nitrides; Quantum chemistry; Semiconductor alloys; 3D simulations; Blue light emitting diodes; Carriers transport; Electrical efficiency; Forward voltage; Green light emitting diodes; Lightemitting diode; Multiquantum-well (MQW); Quantum-wells; Simulation comparison; Semiconductor quantum wells |
顯示於: | 電機工程學系 |
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