Spectral Correlation of Electrooptical Frequency Techniques in Perovskite Solar Cells Beyond Impedance Spectroscopy
Agustín Bou a, Adam Pockett b, Dimitrios Raptis b, Trystan Watson b, Matthew J. Carnie b, Juan Bisquert a
a Universitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain
b SPECIFIC – Swansea University, Materials Research Centre, College of Engineering, UK, Bay Campus, Swansea, SA1 8EN,, SWANSEA, United Kingdom
Proceedings of International Conference on Impedance Spectroscopy and Related Techniques in Metal Halide Perovskites (PERIMPED)
Online, Spain, 2020 October 6th - 7th
Organizers: Juan Bisquert, Bruno Ehrler and Eline Hutter
Oral, Agustín Bou, presentation 013
Publication date: 25th September 2020

Small perturbation techniques have been widely used for the investigation of perovskite solar cells and have helped understand important aspects of their operation. An adequate interpretation of the spectra given by impedance spectroscopy (IS), intensity-modulated photocurrent spectroscopy (IMPS) and intensitymodulated photovoltage spectroscopy (IMVS) is key for the understanding of device operation. The utilization of a correct equivalent circuit to fit the spectra and extract real parameters is needed to get this information and provide a proper interpretation. In this work, we present an equivalent circuit based on previous studies [1],[2] which is able both to reproduce the most general features and also the exotic behaviours found in impedance spectra. From the measurements, we demonstrate that the mid-frequency features that appear in IS spectra clearly depend on the active layer thickness and we prove the spectral correlation of the three techniques that has been suggested theoretically.[3]

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