Proceedings of Online School on Fundamentals of Emerging Solar Cells (PVSCHOOL)
DOI: https://doi.org/10.29363/nanoge.pv school.2021.007
Publication date: 29th January 2021
One approach for assessing the dynamics of charge recombination and transport processes in working solar cells is to make transient and/or frequency domain measurements of photovoltage, photocurrent and capacitance. For perovskite solar cells, interpretation of these measurements is complicated by apparently high concentrations, low mobility ionic charges in the perovskite layer in additional to free electrons and holes. I will discuss an equivalent circuit model which couples the behaviour of mobile ionic charge to the behaviour of free electrons and holes in the device. The model provides a framework for understanding transient, impedance, and capacitance measurements of metal halide perovskite devices, allowing (somewhat) useful information to be extracted from the measurements.
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