Nonlinear Response of Si-Based Solar Cells in Linearly Polarized Light under Low Illumination

Abstract

The linearly polarization photosensitivity of Si-based solar cells has been investigated. It has been shown that the angular dependence of the open-circuit voltage and light intensity are observed similar change trend. However, a contrary behavior is reported in the angular dependence of the ratio between the open-circuit voltage and polarized light intensity. Through the establishment of a theoretical model and detailed analysis, it is found that the nonlinear effects play a crucial role in the photovoltage responses of solar cells under low illumination. The angular dependence of the ratio of the open-circuit voltage to the light intensity is inversely proportional to the square of the cosine function. This work is very significant for the photovoltaic system research.