Photocurrent spectroscopy of single CdS nanosheets: Valence band structure and two photon absorption

Authors
Kumar, P.Wade, A.Smith, L. M.Jackson, H. E.Yarrison-Rice, J. M.Choi, Y. -J.Park, J. -G.
Issue Date
2011-04-04
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.98, no.14
Abstract
Photocurrent spectroscopy has been carried out on single CdS nanosheet devices in the metal-semiconductor-metal configuration with both Schottky and Ohmic contacts. Spatial imaging of the photocurrent shows that the photosensitive regions are localized at the reverse biased contact for Schottky type contacts and uniformly distributed throughout the nanosheet for Ohmic contacts. Photocurrent spectra show excitonic resonances at low temperatures corresponding to the A, B, C hole bands. Subband gap pulsed laser excitation reveals two-photon absorption dominated photocurrents consistent with a nonlinear coefficient of beta = 2 cm/GW for these nanosheet devices. (C) 2011 American Institute of Physics. [doi:10.1063/1.3573859]
Keywords
NANOWIRES; PHOTOLUMINESCENCE; TEMPERATURE; EVAPORATION; DEPOSITION; GROWTH; ZNS; NANOWIRES; PHOTOLUMINESCENCE; TEMPERATURE; EVAPORATION; DEPOSITION; GROWTH; ZNS; Cadmium compounds; II-VI semiconductors; nanostructured materials; ohmic contacts; photoconductivity; Schottky barriers; two-photon spectra; valence bands
ISSN
0003-6951
URI
https://pubs.kist.re.kr/handle/201004/130451
DOI
10.1063/1.3573859
Appears in Collections:
KIST Article > 2011
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