High-performance, single-pyramid micro light-emitting diode with leakage current confinement layer. (17th February 2015)

• Record Type: Journal Article
• Authors: Chen, Weijie; Hu, Guoheng; Lin, Jiali; Jiang, Jianliang; Liu, Minggang; Yang, Yibin; Hu, Gangwei; Lin, Yan; Wu, Zhisheng; Liu, Yang; Zhang, Baijun
• Is Part Of: Applied physics express. Volume 8:Number 3(2015:Mar.)
• Publication Date: 2015-02-17
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.8.032102
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: A high-performance, electrically driven, single-pyramid, micro light-emitting diode (micro-LED) was demonstrated. An insulated SiO2 layer, which served as a leakage current confinement layer (LCC layer), was deposited at the lower part of the pyramid, before the deposition of the transparent conducting layer. The micro-LED with the LCC layer demonstrated a decrease in reverse leakage current by two orders of magnitude and a 190% increase in light output at 500 µA compared to a micro-LED without an LCC layer. The small leakage current enables the micro-LED to operate with an ultra-low injection current (<1 µA). The improved performance of the micro-LED is attributed to the presence of the LCC layer, which blocks the direct pathway of the leakage current via threading dislocations distributed at the lower part of pyramid and causes carriers to be injected more effectively into the active layers at the nearly defect-free apex of the pyramidal LED.