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Nonlinear Two-Photon Photocurrent Spectroscopy of CdS Nanosheets

  • Parveen Kumar (a1), Aaron Wade (a1), Leigh Morris Smith (a1), Howard E Jackson (a1), Jan M Yarrison-Rice (a2), Young-Jin Choi (a3) and Jae-Gwan Park (a3)...

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.

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Keywords

Nonlinear Two-Photon Photocurrent Spectroscopy of CdS Nanosheets

  • Parveen Kumar (a1), Aaron Wade (a1), Leigh Morris Smith (a1), Howard E Jackson (a1), Jan M Yarrison-Rice (a2), Young-Jin Choi (a3) and Jae-Gwan Park (a3)...

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