Improved current spreading performance of a GaN-based light-emitting diode with a stair-like ITO layer

Jian Kai Liou, Chun Chia Chen, Po Cheng Chou, Tsung Yuan Tsai, Shiou Ying Cheng, Wen Chau Liu

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A GaN-based light-emitting diode (LED) with a stair-like ITO layer is studied. The stair-like ITO structure is achieved by using a simple wet etching process. The current distribution could be adjusted by the different thickness of each step in this stair-like ITO layer. The current injected from p-pad is forced to be spread outside by the thicker ITO layer below the p-pad, which exhibits larger parasitic series resistance, instead of flowing downward directly. The current spreading effect could be enhanced. As compared with a conventional LED, at 20 mA, the studied device with a stair-like ITO layer shows 13.8% improvement in light output power. A lower turn-on voltage is also achieved.

Original languageEnglish
Pages (from-to)21-24
Number of pages4
JournalSolid-State Electronics
Volume99
DOIs
Publication statusPublished - 2014 Sep

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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