Effect of the electrode pattern on current spreading and driving voltage in a GaNSapphire LED chip

Gwo Jiun Sheu, Farn Shiun Hwu, Jyh Chen Chen, Jinn Kong Sheu, Wei Chi Lai

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

The effects of p- and n-electrode patterning on the current spreading and driving voltage of a side-view GaNsapphire light-emitting diode (LED) chip are investigated via a numerical simulation. The numerical results (current distributions) for the striped pattern p-electrode are well consistent with the optical emission patterns taken from emission images. A desirable uniformity of the current distribution in the active layer can be obtained by the appropriate arrangement of p- and n-electrode patterns. At the same time, a lower voltage drop in the LED chip is also obtained due to a more uniform current distribution in the p-GaN layer and a smaller overall distance for current movement in the n-GaN layer. With an injection current of 30 mA, a decrease in driving voltage of 13% for well-designed electrode patterns can achieve compared to the control devices considered in this study.

Original languageEnglish
Pages (from-to)H836-H840
JournalJournal of the Electrochemical Society
Volume155
Issue number10
DOIs
StatePublished - 2008

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