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Effect of Solar Radiation of Different Power on the Internal Amplification of the Primary Photocurrent in Heterostructures Based on Cadmium Telluride

Abstract

The paper investigates and analyzes the current–voltage characteristics of the CdO-CdTe-Mo heterostructure, which is photosensitive to visible and near infrared electromagnetic radiation, in a wide range of solar radiation illumination power with an AM1.5 spectrum. The effect of internal injection amplification of the primary photocurrent in the forward direction of the applied voltage to the heterostructure is established. This effect is explained in terms of the positive feedback mechanism when the resistance of the photosensitive region of the structure is modulated by injected charge carriers and the external applied bias voltage is redistributed between the pn junction and the base region. The photosensitivity of the CdO-CdTe-Mo heterostructure, in the charge carrier injection mode, increases with an increase in the applied bias voltage and a decrease in the power of the incident solar radiation. This is explained by the effective modulation of the base of the structure by the injected charge carriers at low radiation powers.

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ACKNOWLEDGMENTS

The authors are grateful to the employees of the Department of Semiconductors, Physical-Technical Institute, Academy of Sciences of the Republic of Uzbekistan, as well as the staff of the National Research Institute of Renewable Energy Sources under the Ministry of Energy of the Republic of Uzbekistan for their help in the process of researching photodetectors, as well as advice in discussing the results of scientific research.

Funding

The study was carried out under the basic funding program for fundamental research of the Physical-Technical Institute, Academy of Sciences of the Republic of Uzbekistan.

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Correspondence to R. R. Kabulov.

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Translated by M. Chubarova

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Kabulov, R.R., Gerasimenko, S.Y. & Akbarov, F.A. Effect of Solar Radiation of Different Power on the Internal Amplification of the Primary Photocurrent in Heterostructures Based on Cadmium Telluride. Appl. Sol. Energy 59, 118–124 (2023). https://doi.org/10.3103/S0003701X22601065

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