BROWSE
Detail
Journal Article
Graphene Transparent Electrode for Enhanced Optical Power and Thermal Stability in GaN Light-Emitting Diodes
Cited 38 time in 
Share 
Share
- Authors
- Doo-Hyeb Youn, Young-Jun Yu, HongKyw Choi, Suck-Hwan Kim, Sung-Yool Choi, Choon-Gi Choi
- Issue Date
- 2013-02
- Citation
- Nanotechnology, v.24, no.7, pp.1-7
- ISSN
- 0957-4484
- Publisher
- Institute of Physics (IOP)
- Language
- English
- Type
- Journal Article
- Abstract
- We report an improvement of the optical power and thermal stability of GaN LEDs using a chemically doped graphene transparent conducting layer (TCL) and a low-resistance contact structure. In order to obtain low contact resistance between the TCL and p-GaN surface, a patterned graphene TCL with Cr/Au electrodes is suggested. A bi-layer patterning method of a graphene TCL was utilized to prevent the graphene from peeling off the p-GaN surface. To improve the work function and the sheet resistance of graphene, CVD (chemical vapor deposition) graphene was doped by a chemical treatment using a HNO3 solution. The effect of the contact resistance on the power degradation of LEDs at a high injection current level was investigated. In addition, the enhancement of the optical power via an increase in the current spreading and a decrease in the potential barrier of the graphene TCL was investigated. © 2013 IOP Publishing Ltd.
- KSP Keywords
- Au electrode, Bi-layer, Chemical Vapor Deposition, Contact resistance(73.40.Cg), Contact structure, GaN LED, GaN surface, Injection current, Low contact resistance, Patterned graphene, Peeling off