Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The surge of organic-inorganic lead halide perovskites with very large efficiency, has opened up the interest to understand the operation of the solar cell, in terms of physical photovoltaic processes. We have used the measurement of impedance spectroscopy in combination of voltage ramps and we present a series of insights about the physical processes occurring in perovskite solar cells in photovoltaic operation. Apart from the remarkable bulk properties of this class of semiconductors, it has been realized that the contacts are a key aspect of the operation and show dynamic interactions. We start from the distinction between capacitive and non capacitive hysteresis, we provide an interpretation of capacitances as a function of frequency both in dark and under light, and we discuss the meaning iof resistances and how they are primarily related to the operation of contacts. A variety of configurations of perovskite solar cells and they dynamic features is analyzed.
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