Studying Perovskite Solar Cells in Reverse Bias to Accelerate and Investigate Degradation Due to Electrochemistry and Halogen Migration

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Metal halide perovskite solar cells degrade when holes oxidize iodine and it leaves the cells. This project team has shown that this process happens faster when solar cells operate in reverse bias, which occurs when they are shaded and other cells in the module are illuminated. This project proposes methods for making impermeable contacts so that iodine stays in the perovskite film. The team will also test its hypothesis that the nature of degradation in reverse bias is similar to degradation under normal operating conditions, to potentially introduce ways to test the stability of perovskite solar cells and help forecast their long-term stability in the field.