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Title: Photothermoelectric effects in localized photocurrent of individual vo 2 nanowires
Authors: Varghese, B. 
Tamang, R. 
Tok, E.S. 
Mhaisalkar, S.G.
Sow, C.H. 
Issue Date: 9-Sep-2010
Citation: Varghese, B., Tamang, R., Tok, E.S., Mhaisalkar, S.G., Sow, C.H. (2010-09-09). Photothermoelectric effects in localized photocurrent of individual vo 2 nanowires. Journal of Physical Chemistry C 114 (35) : 15149-15156. ScholarBank@NUS Repository.
Abstract: Photocurrent studies of individual and isolated VO2 nanowires (NWs) with Pt metal contacts were conducted by using a focused laser beam. With localized probing, the photoresponse arising from the NW-Pt contact junctions and the main body of the NW can be separately examined. Rapid photoresponse (with and without bias) toward visible and infrared laser irradiation was observed to arise primarily from the NW-Pt contacts. Experiments at elevated temperature (above the semiconductor-metal transition temperature of VO 2) revealed a remarkable ∼500 fold enhancement in the photocurrent generated at the NW-Pt contact junctions at zero external bias. Photoinduced thermoelectric effect is proposed as the key carrier transport mechanism dictating the photocurrent generated at the NW-Pt interface. ©2010 American Chemical Society.
Source Title: Journal of Physical Chemistry C
ISSN: 19327447
DOI: 10.1021/jp1051936
Appears in Collections:Staff Publications

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