Improved carrier confinement and distribution in InGaN light-emitting diodes with three-layer staggered QWs

Compared with conventional InGaN Quantum Wells (QWs), staggered InGaN QWs offer improved optical and electronic properties. This work studied the carrier concentration, band structure, overlap of hole and electron wave functions, and polarization field of three-layer staggered QWs in the blue spectr...

Full description

Bibliographic Details
Main Authors: Li-E. Cai, Chao-Zhi Xu, Fei-Bing Xiong, Ming-Jie Zhao, Hai-Feng Lin, Hong-Yi Lin, Dong Sun
Format: Article
Language:English
Published: AIP Publishing LLC 2021-07-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/5.0054062
Description
Summary:Compared with conventional InGaN Quantum Wells (QWs), staggered InGaN QWs offer improved optical and electronic properties. This work studied the carrier concentration, band structure, overlap of hole and electron wave functions, and polarization field of three-layer staggered QWs in the blue spectral region and analyzed them in detail theoretically to explore the source and the dominant mechanism for improvement. Although theoretical studies indicate that the polarization field in QWs of staggered InGaN QWs is larger, the carrier confinement effect is stronger, and the carrier distribution is more uniform. Therefore, three-layer staggered QWs can improve overlapping of the hole and electron wave functions and then enhance the recombination rate so as to increase the optical output power and electroluminescence intensity. Moreover, the performance of the staggered structure C with the lowest indium content at the center of the well is better than that of the step-staggered structure B.
ISSN:2158-3226