Vertical pillar-superlattice array and graphene hybrid light emitting diodes

Jung Min Lee, Jae Woong Choung, Jaeseok Yi, Dong Hyun Lee, Monica Samal, Dong Kee Yi, Chul Ho Lee, Gyu Chul Yi, Ungyu Paik, John A. Rogers, Won Il Park

Research output: Contribution to journalArticlepeer-review

124 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)2783-2788
Number of pages6
JournalNano Letters
Issue number8
Publication statusPublished - 2010 Aug 11
Externally publishedYes


  • 3D architectures
  • Pillar array
  • graphene
  • light-emitting diodes
  • transparent electrodes

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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