Work-function-tuned multilayer graphene as current spreading electrode in blue light-emitting diodes

This letter reports on the implementation of multilayer graphene (MLG) as a current spreading electrode in GaN-based blue light-emitting diodes. We demonstrate two facile strategies to maneuver the electrical coupling between p -GaN layer and MLG. Using a work-function-tuned MLG and a thin gold (Au)...

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Bibliographic Details
Published in:Applied physics letters 2012-01, Vol.100 (2), p.023502-023502-4
Main Authors: Chandramohan, S., Hye Kang, Ji, Katharria, Y. S., Han, Nam, Seon Beak, Yun, Bok Ko, Kang, Bae Park, Jong, Kyu Kim, Hyun, Suh, Eun-Kyung, Hong, Chang-Hee
Format: Article
Language:English
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Summary:This letter reports on the implementation of multilayer graphene (MLG) as a current spreading electrode in GaN-based blue light-emitting diodes. We demonstrate two facile strategies to maneuver the electrical coupling between p -GaN layer and MLG. Using a work-function-tuned MLG and a thin gold (Au) metal interlayer, the current spreading and thus the device forward voltage are considerably improved. We attribute these improvements to the diminution in work function difference between p -GaN and MLG, the decrease of specific contact resistance, and the enhancement in the conductivity of MLG film as a result of doping. In addition, rapid thermal annealing at elevated temperature is found to provide additional pathway for enhanced carrier injection.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3675631