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Beyond the First Quadrant: Origin of the High Frequency Intensity‐Modulated Photocurrent/Photovoltage Spectroscopy Response of Perovskite Solar Cells / Adam Pockett, Michael Spence, Suzanne Thomas, Dimitrios Raptis, Trystan Watson, Matt Carnie

Solar RRL, Volume: 5, Issue: 5, Start page: 2100159

Swansea University Authors: Adam Pockett, Michael Spence, Suzanne Thomas, Dimitrios Raptis, Trystan Watson, Matt Carnie

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DOI (Published version): 10.1002/solr.202100159

Abstract

The complete interpretation of small perturbation frequency‐domain measurements on perovskite solar cells has proven to be challenging. This is particularly true in the case of intensity‐modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) measurements in which the high frequency response is...

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Published in: Solar RRL
ISSN: 2367-198X 2367-198X
Published: Wiley 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa56713
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Abstract: The complete interpretation of small perturbation frequency‐domain measurements on perovskite solar cells has proven to be challenging. This is particularly true in the case of intensity‐modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) measurements in which the high frequency response is obscured by instrument limitations. Herein, a new experimental methodology capable of accurately resolving the high frequency response—often observable in the second and third quadrants of the complex plane—of a range of perovskite devices is demonstrated. By combining single‐frequency IMPS/IMVS measurements, it is able to construct the time dependence of the IMPS/IMVS response of these devices during their initial response to illumination. This reveals significant negative photocurrent/photovoltage signals at high frequency while devices reach steady state, which is in keeping with observations made from comparable time‐domain transient measurements. These techniques allow the underlying interfacial recombination and ion migration processes to be assessed, which are not always evident using steady‐state measurements. The ability to study and mitigate these processes is vital in optimizing the real‐world operation of devices.
Keywords: intensity modulated photocurrent spectroscopy; ion migration; perovskite solar cells; recombination
College: College of Engineering
Issue: 5
Start Page: 2100159