Equivalent Circuit Model for Impedance Analysis of Solar Cells Degraded Due to Mechanical Stress

抄録

In recent years, various failure detection methods for solar cells have been proposed. However, these methods have problems in detecting faults, and a general fault detection method has not yet been established. Therefore, we have introduced electrochemical impedance spectroscopy (EIS), which is often used for evaluation of electrochemical devices such as secondary batteries and fuel cells, to detect abnormalities in solar cells. In this study, we reproduced the mechanical deterioration state of the solar cell module, acquired the measurement data using EIS, and investigated the equivalent circuit that expresses this state. Nyquist and Bode diagrams of the measured results of the solar cell module and the values calculated by the proposed equivalent circuit agree with each other. This result indicates the applicability of the method for detecting defects in solar cells using EIS, and the method we proposed will contribute to the development of the field of maintenance and inspection of solar cells.