Organic field effect transistors based on graphene and hexagonal boron nitride heterostructures

Seok Ju Kang, Gwan Hyoung Lee, Young Jun Yu, Yue Zhao, Bumjung Kim, Kenji Watanabe, Takashi Taniguchi, James Hone, Philip Kim, Colin Nuckolls

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

Enhancing the device performance of single crystal organic field effect transistors (OFETs) requires both optimized engineering of efficient injection of the carriers through the contact and improvement of the dielectric interface for reduction of traps and scattering centers. Since the accumulation and flow of charge carriers in operating organic FETs takes place in the first few layers of the semiconductor next to the dielectric, the mobility can be easily degraded by surface roughness, charge traps, and foreign molecules at the interface. Here, a novel structure for high-performance rubrene OFETs is demonstrated that uses graphene and hexagonal boron nitride (hBN) as the contacting electrodes and gate dielectric layer, respectively. These hetero-stacked OFETs are fabricated by lithography-free dry-transfer method that allows the transfer of graphene and hBN on top of an organic single crystal, forming atomically sharp interfaces and efficient charge carrier-injection electrodes without damage or contamination. The resulting heterostructured OFETs exhibit both high mobility and low operating gate voltage, opening up new strategy to make high-performance OFETs and great potential for flexible electronics. Organic field effect transistors (OFETs) based on 2D graphene and hexagonal boron nitride heterostructures are fabricated by a dry-transfer method. The resulting heterostructured OFETs exhibit both high mobility and low operating voltage due to the atomically sharp interfaces of hBN flake and efficient charge carrier-injection from graphene electrodes.

Original languageEnglish
Pages (from-to)5157-5163
Number of pages7
JournalAdvanced Functional Materials
Volume24
Issue number32
DOIs
Publication statusPublished - 2014 Aug 27

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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