• 文献标题:   Vertical Pillar-Superlattice Array and Graphene Hybrid Light Emitting Diodes
  • 文献类型:   Article
  • 作  者:   LEE JM, CHOUNG JW, YI J, LEE DH, SAMAL M, YI DK, LEE CH, YI GC, PAIK U, ROGERS JA, PARK WI
  • 作者关键词:   pillar array, graphene, lightemitting diode, 3d architecture, transparent electrode
  • 出版物名称:   NANO LETTERS
  • ISSN:   1530-6984
  • 通讯作者地址:   Hanyang Univ
  • 被引频次:   111
  • DOI:   10.1021/nl100648y
  • 出版年:   2010

▎ 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.