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Nonlinear Two-Photon Photocurrent Spectroscopy of CdS Nanosheets

机译:CdS纳米片的非线性双光子光电流光谱

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摘要

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.
机译:我们研究了在CdS纳米结构的能隙之上和之下的激光激发的光激发带电载流子的光电流。我们在带有子带隙激发的肖特基接触的金属-半导体-金属配置中的CdS纳米片器件中观察到非线性光电流。对两个光子吸收为主的光电流的分析表明,这些纳米片器件的非线性系数为β= 2 cm / GW,与批量CdS相当。我们证明了使用光电流极化测量来确定纳米片中原子的方向。

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