Impedance spectroscopy for perovskite photovoltaics
Elizabeth von Hauff a
a Vrije University (VU) Amsterdam, De Boelelaan 1081, Amsterdam, Netherlands
International Conference on Hybrid and Organic Photovoltaics
Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Online, Spain, 2021 May 24th - 28th
Organizers: Marina Freitag, Feng Gao and Sam Stranks
Invited Speaker, Elizabeth von Hauff, presentation 095
Publication date: 11th May 2021

Impedance spectroscopy has been widely applied to study electrochemical and solid state energy conversion and storage devices. Performing impedance spectroscopy, however, on emerging photovoltaic materials, such as metal-halide perovskites, presents new challenges related to the unusual material properties and complex device architectures. In this talk I will give a brief introduction to impedance spectroscopy, and discuss how impedance can be applied to extrapolate information about resistive and capacitive signatures, as well as relevant timescales of dynamic processes. Practical tips for performing experiments are discussed, as well as guidelines for extracting meaningful data from common analyses, such as equivalent circuit modelling and capacitance-frequency spectroscopy. The underlying assumptions of each analysis approach, as well as the advantages, limitations, and potential pitfalls are discussed. Ultimately impedance spectroscopy can yield useful information over material and interface stability, but should be combined with complementary,  corroborative measurements in order to extract quantitative information about physical processes [1,2].

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