Abstract
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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St-Antoine, B.C., Ménard, D. & Martel, R. Photothermoelectric effects in single-walled carbon nanotube films: Reinterpreting scanning photocurrent experiments. Nano Res. 5, 73–81 (2012). https://doi.org/10.1007/s12274-011-0186-x
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DOI: https://doi.org/10.1007/s12274-011-0186-x