Journal
NANO RESEARCH
Volume 5, Issue 2, Pages 73-81Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-011-0186-x
Keywords
Carbon nanotubes; photothermoelectric; photoconductivity; Seebeck coefficient; doping
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Funding
- Canada Research Chair (CRC)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds Quebecois de Recherche en Nature et Technologies (FQRNT)
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We revisit the mechanism leading to the photoresponse of locally illuminated single-walled carbon nanotube (SWNT) films deposited on substrates. Our study examines the impact of multiple device parameters and provides many evidences that the position-dependent photocurrent is dominated by photothermoelectric effects. The photoresponse arises from the temperature variations at the metal-nanotube film interfaces, where mismatches of the Seebeck coefficients are measured. Our work also stresses the impact of the substrates, electrode materials and post-thermal treatments on the amplitude and dynamics of the photoresponse. The knowledge gained should guide the future development of photothermoelectric devices and detectors based on SWNTs.
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