Interpretation of Kinetic Processes Governing the Operation of Perovskite Solar Cells
Francisco Fabregat-Santiago a, Juan Bisquert a
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Oral, Francisco Fabregat-Santiago, presentation 128
Publication date: 7th November 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 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 of resistances and how they are primarily related to the operation of contacts. We identify an accumulation capacitance under illumination, which implies also ions polarization at the contacts that creates memory effects. These effects induce hysteresis in current-voltage nd slow fluctuation of the photovoltaic characteristics.

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