Carbon nanotube-graphene composite film as transparent conductive electrode for GaN-based light-emitting diodes

Chun Hong Kang, Chao Shen, M. Shuaib M. Saheed, Norani Muti Mohamed, Tien Khee Ng, Boon S. Ooi, Zainal Arif Burhanudin

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Transparent conductive electrodes (TCE) made of carbon nanotube (CNT) and graphene composite for GaN-based light emitting diodes (LED) are presented. The TCE with 533-Ω/□ sheet resistance and 88% transmittance were obtained when chemical-vapor-deposition grown graphene was fused across CNT networks. With an additional 2-nm thin NiOx interlayer between the TCE and top p-GaN layer of the LED, the forward voltage was reduced to 5.12 V at 20-mA injection current. Four-fold improvement in terms of light output power was observed. The improvement can be ascribed to the enhanced lateral current spreading across the hybrid CNT-graphene TCE before injection into the p-GaN layer.
Original languageEnglish (US)
Pages (from-to)081902
JournalApplied Physics Letters
Volume109
Issue number8
DOIs
StatePublished - Aug 23 2016

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