Vertical Pillar-Superlattice Array and Graphene Hybrid Light Emitting Diodes
Vertical Pillar-Superlattice Array and Graphene Hybrid Light Emitting Diodes
复制标题
DOI：
10.1021/nl100648y
复制
发表时间：
2010-08-01
期刊：
影响因子：
10.8
通讯作者：
Park, Won Il
中科院分区：
文献类型：
--
作者：
Lee, Jung Min;Choung, Jae Woong;Park, Won Il
我们报告了一种类型的设备，结合垂直阵列的一维（1D）柱超晶格（PSL）结构与2D石墨烯片产生一类发光二极管（LED）有趣的机械，光学和电学特性。在该应用中，涂覆有非常薄的金属层的石墨烯片表现出良好的机械和电气性能以及以自由悬挂的配置安装在PSL阵列上作为顶部窗口电极的能力。光学表征表明，石墨烯即使在沉积薄金属膜之后也表现出优异的光学透明性。石墨烯/金属（Gr/M）接触到GaAs的热退火降低了接触电阻，以提供增强的载流子注入。所得到的PSL-Gr/M LED在大面积上表现出明亮的光发射。结果表明，石墨烯基材料在具有不寻常的非平面3D架构的设备中用作电极。
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.