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The wavelength dependence of drift velocities of photogenerated electrons in CdTe

  • Regular Article - Mesoscopic and Nanoscale Systems
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Abstract

The drift velocity of photo-generated electrons in CdTe by lasers with wavelengths of 532, 355, and 266 nm is studied by the Monte Carlo method. The effects of laser wavelengths on the electron drift velocity are systematically investigated under various laser fluxes, doping densities, and temperatures. It is found that the drift velocity as a function of electric field \({v}_{\mathrm{d}}(E)\) has a close relationship with the laser wavelengths: the electron drift velocity in CdTe becomes larger when a longer photoexcitation wavelength is used. On the other hand, the doping effect, as well as the effect of the laser energy flux, on the \({v}_{\mathrm{d}}(E)\) dependence demonstrates different characteristics for different laser wavelengths. The difference in electron drift velocity caused by the various wavelengths reduces with increasing temperatures. In the case of a low laser energy flux, doping in CdTe plays a remarkable role in \({v}_{\mathrm{d}}(E)\) relations. These new results are helpful in understanding the microscopic mechanism of relaxation processes of photo-excited carriers and applications of CdTe-based optoelectronic devices.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request. This manuscript has no associated data or the data will not be deposited.

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Acknowledgements

This work is supported by Science and Technology Program of Guangzhou, China (Grant no. 201804010444).

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  1. School of Information Engineering, Guangdong University of Technology, Guangzhou, 510006, People’s Republic of China

    DongFeng Liu

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  1. DongFeng Liu
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Correspondence to DongFeng Liu.

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Liu, D. The wavelength dependence of drift velocities of photogenerated electrons in CdTe. Eur. Phys. J. B 96, 129 (2023). https://doi.org/10.1140/epjb/s10051-023-00595-y

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