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Title: Influence of carrier overflow on the forward-voltage characteristics of InGaN-based light-emitting diodes

We investigate the influence of carrier overflow on the forward-voltage characteristics of the InGaN-based blue light-emitting-diode (LED) by comparing the temperature-dependent characteristics of the electroluminescence (EL) efficiency, the EL spectra, and the current-voltage relation over a wide range of temperature (50–300 K). Based on these experimental results, we demonstrate that the simple ohmic potential drop in the Shockley diode equation is not sufficient to explain the experimental data when the severe carrier overflow to the p-(Al)GaN layer induces the efficiency droop in the LED device. The anomalous relation between current and voltage at cryogenic temperatures is explained by the space-charge-limited current formed by the overflown electrons, rather than by the increase of a constant series resistance in the p-(Al)GaN layer.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Department of Electronics and Communication Engineering, Hanyang University, ERICA Campus, Ansan, Gyeonggi-do 426-791 (Korea, Republic of)
  2. Department of Applied Physics and Department of Bionanotechnology, Hanyang University, ERICA Campus, Ansan, Gyeonggi-do 426-791 (Korea, Republic of)
  3. Department of Applied Physics and Electronics, Sangji University, Wonju, Gangwon-do 220-702 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22391931
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DOPED MATERIALS; EFFICIENCY; ELECTROLUMINESCENCE; GALLIUM NITRIDES; INDIUM COMPOUNDS; LIGHT EMITTING DIODES; SPACE CHARGE; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0273-0400 K