High photoresponsivity in an all-graphene p–n vertical junction photodetector

Chang Oh Kim, Sung Kim, Dong Hee Shin, Soo Seok Kang, Jong Min Kim, Chan Wook Jang, Soong Sin Joo, Jae Sung Lee, Ju Hwan Kim, Suk-Ho Choi () and Euyheon Hwang
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Chang Oh Kim: College of Applied Science, Kyung Hee University
Sung Kim: College of Applied Science, Kyung Hee University
Dong Hee Shin: College of Applied Science, Kyung Hee University
Soo Seok Kang: College of Applied Science, Kyung Hee University
Jong Min Kim: College of Applied Science, Kyung Hee University
Chan Wook Jang: College of Applied Science, Kyung Hee University
Soong Sin Joo: College of Applied Science, Kyung Hee University
Jae Sung Lee: College of Applied Science, Kyung Hee University
Ju Hwan Kim: College of Applied Science, Kyung Hee University
Suk-Ho Choi: College of Applied Science, Kyung Hee University
Euyheon Hwang: SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Intensive studies have recently been performed on graphene-based photodetectors, but most of them are based on field effect transistor structures containing mechanically exfoliated graphene, not suitable for practical large-scale device applications. Here we report high-efficient photodetector behaviours of chemical vapor deposition grown all-graphene p–n vertical-type tunnelling diodes. The observed photodetector characteristics well follow what are expected from its band structure and the tunnelling of current through the interlayer between the metallic p- and n-graphene layers. High detectivity (~1012 cm Hz1/2 W−1) and responsivity (0.4~1.0 A W−1) are achieved in the broad spectral range from ultraviolet to near-infrared and the photoresponse is almost consistent under 6-month operations. The high photodetector performance of the graphene p–n vertical diodes can be understood by the high photocurrent gain and the carrier multiplication arising from impact ionization in graphene.

Date: 2014
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DOI: 10.1038/ncomms4249

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