Large-area transparent conductive few-layer graphene electrode in GaN-based ultra-violet light-emitting diodes

Byung Jae Kim, Chongmin Lee, Younghun Jung, Kwang Hyeon Baik, Michael A. Mastro, Jennifer K. Hite, Charles R. Eddy, Jihyun Kim

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Abstract

We report on the development of a large-area few-layer graphene (FLG)-based transparent conductive electrode as a current spreading layer for GaN-based ultraviolet (UV) light-emitting diodes (LEDs). Large-area FLG was deposited on Cu using the chemical vapor deposition (CVD) method and subsequently transferred to the surface of the UV LED. UV light at a peak of 372 nm was emitted through the FLG-based transparent conductive electrode. The current spreading effects of FLG were clearly evident in both the optical images of electroluminescence (EL) and current-voltage (I-V) characteristics. Degradation of the FLG-based transparent conductive electrode could be induced by high power operation. Our results indicate that a large-area FLG-based electrode on GaN offers excellent current spreading and ultra-violet transparency properties when compared to the standard optoelectronic indium tin oxide (ITO) contact layer.

Original languageEnglish
Article number143101
JournalApplied Physics Letters
Volume99
Issue number14
DOIs
Publication statusPublished - 2011 Oct 3

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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