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.
Bibliographical noteKAUST Repository Item: Exported on 2021-02-19
Acknowledged KAUST grant number(s): BAS/1/1614-01-01
Acknowledgements: The authors would like to acknowledge the Graduate Assistantship Scheme from Universiti Teknologi PETRONAS. This work was partially supported by the Fundamental Research Grant Scheme from Ministry of Higher Education of Malaysia (Grant No. FRGS/1/2015/TK04/UTP/02/2), KAUST Baseline Funding (Grant No. BAS/1/1614-01-01), and King Abdulaziz City for Science and Technology (KACST) Technology Innovation Center (TIC) for Solid State Lighting (Grant No. KACST TIC R2-FP-008).