Study of GaN-Based Light-Emitting Diode (LED) with a Hybrid Surface Structure

Wei Cheng Chen, Jing Shiuan Niu, I. Ping Liu, Yu Lin Lee, Shiou Ying Cheng, Der Feng Guo, Wen Chau Liu

Research output: Contribution to journalArticlepeer-review

Abstract

A hybrid surface structure, incorporating an Ag-grid-based aluminum-doped zinc oxide (AZO) transparent conductive layer (TCL), a microhole array, 45°-sawtooth sidewalls, and an SiO2 nanoparticle (NP)/microsphere (MS) passivation layer, is proposed for the characteristic improvement of GaN-based light-emitting diodes (LEDs). In order to optimize the contact behavior between the AZO and p-GaN layers, a 2-D Ag grid is applied on the contact interface. Because series resistance Rs is reduced by the conductive Ag-grid pattern, a lower forward voltage and a better current spreading ability are obtained. Compared with a conventional GaN LED with an injection current of 200 mA, the proposed device exhibits a forward voltage of 4.01 V, reduced from 4.34 V, and presents 33%, 34.4%, 45.4%, 33.1%, and 45.3% enhancements in the light output power (LOP), luminous flux, luminous efficacy, external quantum efficiency (EQE), and wall-plug efficiency (WPE), respectively. Moreover, a more effective current spreading in the light emission mapping image and a higher intensity in the far-field pattern are achieved. Improvements of both electrical and optical properties verify that the proposed device is promising for practical applications in solid-state lighting.

Original languageEnglish
Article number9214908
Pages (from-to)4953-4957
Number of pages5
JournalIEEE Transactions on Electron Devices
Volume67
Issue number11
DOIs
Publication statusPublished - 2020 Nov

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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