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Nonlinear Two-Photon Photocurrent Spectroscopy of CdS Nanosheets

Published online by Cambridge University Press:  12 July 2012

Parveen Kumar ,
Aaron Wade ,
Leigh Morris Smith ,
Howard E Jackson ,
Jan M Yarrison-Rice ,
Young-Jin Choi  and
Jae-Gwan Park
Parveen Kumar
Affiliation:
Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221-0011, USA
Aaron Wade
Affiliation:
Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221-0011, USA
Leigh Morris Smith
Affiliation:
Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221-0011, USA
Howard E Jackson
Affiliation:
Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221-0011, USA
Jan M Yarrison-Rice
Affiliation:
Department of Physics, Miami University, Oxford, Ohio 45056, USA
Young-Jin Choi
Affiliation:
Nano Materials Research Center, Korea Institute of Science and Technology, Seoul 130-650, Korea
Jae-Gwan Park
Affiliation:
Nano Materials Research Center, Korea Institute of Science and Technology, Seoul 130-650, Korea
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Abstract

We study the photocurrent from photoexcited charged carriers excited with lasers of energy both above and below the energy gap in CdS nanostructures. We observe non-linear photocurrents in CdS nanosheet devices in the metal-semiconductor-metal configuration with Schottky contacts for sub-band gap excitations. Analysis of two-photon absorption dominated photocurrents reveals a nonlinear coefficient of β = 2 cm/GW for these nanosheet devices, which is comparable to those of bulk CdS. We demonstrate the use of the photocurrent polarization measurements to determine the orientation of atoms in the nanosheet.

Keywords

photoconductivitynanostructureoptoelectronic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1439: Symposium N/AA – Nanowires and Nanotubes-Synthesis, Properties, Devices, and Energy Applications of One-Dimensional Materials , 2012 , pp. 77 - 81
Copyright
Copyright © Materials Research Society 2012

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