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

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 p–n 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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