Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 19, Issue 17, Pages 2743-2748Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200900408
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Funding
- FANEDD [20071321]
- MOST [2009CB623703]
- NSFC [50873004, 50821061, 20833001]
- Nanoscale Science and Engineering Initiative of the National Science Foundation [CHE-0641523]
- New York State Office of Science, Technology, and Academic Research (NYSTAR)
- National Science Foundation [DMR-0213574]
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Graphene behaves as a robust semimetal with the high electrical conductivity stemming from its high-quality tight two-dimensional crystallographic lattice. It is therefore a promising electrode material. Here, a general methodology for making stable photoresponsive field effect transistors, whose device geometries are comparable to traditional macroscopic semiconducting devices at the nanometer scale, using cut graphene sheets as 2D contacts is detailed. These contacts are produced through oxidative cutting of individual 2D planar graphene by electron beam lithography and oxygen plasma etching. Nanoscale organic transistors based on graphene contacts show high-performance FET behavior with bulk-like carrier mobility, high on/off current ratio, and high reproducibility. Due to the presence of photoactive molecules, the devices display reversible changes in current when they are exposed to visible light. The calculated responsivity of the devices is found to be as high as similar to 8.3 A W-1. This study forms the basis for making new types of ultrasensitive molecular devices, thus initiating broad research in the field of nanoscale/molecular electronics.
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