Vertical Pillar-Superlattice Array and Graphene Hybrid Light Emitting Diodes

被引：116

作者：

Lee, Jung Min ^{[2
]}

Choung, Jae Woong ^{[2
]}

Yi, Jaeseok ^{[2
]}

Lee, Dong Hyun ^{[2
]}

Samal, Monica ^{[3
]}

Yi, Dong Kee ^{[3
]}

Lee, Chul-Ho ^{[4
,5
,6
]}

Yi, Gyu-Chul ^{[5
,6
]}

Paik, Ungyu ^{[1
]}

Rogers, John A. ^{[7
]}

Park, Won Il ^{[2
]}

机构：

[1] Hanyang Univ, Dept Energy Engn, Seoul 133791, South Korea

[2] Hanyang Univ, Div Engn & Mat Sci, Seoul 133791, South Korea

[3] Kyungwon Univ, Div Bionanotechnol, Songnam 461831, South Korea

[4] Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Pohang 790784, South Korea

[5] Seoul Natl Univ, Natl Creat Res Initiat, Ctr Semicond Nanorods, Seoul 151747, South Korea

[6] Seoul Natl Univ, Dept Phys & Astron, Seoul 151747, South Korea

[7] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

来源：

NANO LETTERS | 2010年 / 10卷 / 08期

基金：

新加坡国家研究基金会;

关键词：

Pillar array; graphene; light-emitting diodes; 3D architectures; transparent electrodes; NANOROD ARRAYS; LARGE-AREA; FILMS;

D O I：

10.1021/nl100648y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report a type of device that combines vertical arrays of one-dimensional (1D) pillar-superlattice (PSL) structures with 2D graphene sheets to yield a class of light emitting diode (LED) with interesting mechanical, optical, and electrical characteristics. In this application, graphene sheets coated with very thin metal layers exhibit good mechanical and electrical properties and an ability to mount, in a freely suspended configuration, on the PSL arrays as a top window electrode. Optical characterization demonstrates that graphene exhibits excellent optical transparency even after deposition of the thin metal films. Thermal annealing of the graphene/metal (Gr/M) contact to the GaAs decreases the contact resistance, to provide enhanced carrier injection. The resulting PSL-Gr/M LEDs exhibit bright light emission over large areas. The result suggests the utility of graphene-based materials as electrodes in devices with unusual, nonplanar 3D architectures.

引用

页码：2783 / 2788

页数：6

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