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

Title
Photocurrent spectroscopy of single CdS nanosheets: Valence band structure and two photon absorption
Authors
P. KumarA. WadeL. M. SmithH. E. JacksonJ. M. Yarrison-Rice최영진박재관
Keywords
Cadmium compounds; II-VI semiconductors; nanostructured materials; ohmic contacts; photoconductivity; Schottky barriers; two-photon spectra; valence bands
Issue Date
2011-04
Publisher
Applied physics letters
Citation
VOL 98, NO 14, 143102-1-143102-3
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 β=2 cm/GW for these nanosheet devices.
URI
http://pubs.kist.re.kr/handle/201004/39574
ISSN
0003-6951
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KIST Publication > Article
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