Improved photoresponse with enhanced photoelectric contribution in fully suspended graphene photodetectors

Patil, Vikram; Capone, Aaron; Strauf, Stefan; Yang, Eui-Hyeok

doi:10.1038/srep02791

Improved photoresponse with enhanced photoelectric contribution in fully suspended graphene photodetectors

Journal Article · Fri Sep 27 00:00:00 EDT 2013 · Scientific Reports

DOI:https://doi.org/10.1038/srep02791· OSTI ID:1624655

Patil, Vikram ^[1]; Capone, Aaron ^[2]; Strauf, Stefan ^[2]; Yang, Eui-Hyeok ^[3]

Stevens Inst. of Technology Castle Point on the Hudson, Hoboken, NJ (United States). Dept. of Mechanical Engineering; DOE/OSTI
Stevens Inst. of Technology Castle Point on the Hudson, Hoboken, NJ (United States). Dept. of Physics and Engineering Physics
Stevens Inst. of Technology Castle Point on the Hudson, Hoboken, NJ (United States).

Graphene’s unique optoelectronic properties are promising to realize photodetectors with ultrafast photoresponse over a wide spectral range from far-infrared to ultraviolet radiation. The underlying mechanism of the photoresponse has been a particular focus of recent work and was found to be either photoelectric or photo-thermoelectric in nature and enhanced by hot carrier effects. Graphene supported by a substrate was found to be dominated by the photo-thermoelectric effect, which is known to be an order of magnitude slower than the photoelectric effect. Here we demonstrate fully-suspended chemical vapor deposition grown graphene microribbon arrays that are dominated by the faster photoelectric effect. Substrate removal was found to enhance the photoresponse by four-fold compared to substrate-supported microribbons. Furthermore, we show that the light-current input/output curves give valuable information about the underlying photophysical process responsible for the generated photocurrent. These findings are promising towards wafer-scale fabrication of graphene photodetectors approaching THz cut-off frequencies.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-98CH10886

OSTI ID:: 1624655

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 3; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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