Ionic-to-electronic current amplification in hybrid perovskite solar cells: ionically gated transistor-interface circuit model explains hysteresis and impedance of mixed conducting devices

Moia, D. et al. (2019) Ionic-to-electronic current amplification in hybrid perovskite solar cells: ionically gated transistor-interface circuit model explains hysteresis and impedance of mixed conducting devices. Energy and Environmental Science, 12(4), pp. 1296-1308. (doi: 10.1039/C8EE02362J)

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Abstract

Mobile ions in hybrid perovskite semiconductors introduce a new degree of freedom to electronic devices suggesting applications beyond photovoltaics. An intuitive device model describing the interplay between ionic and electronic charge transfer is needed to unlock the full potential of the technology. We describe the perovskite-contact interfaces as transistors which couple ionic charge redistribution to energetic barriers controlling electronic injection and recombination. This reveals an amplification factor between the out of phase electronic current and the ionic current. Our findings suggest a strategy to design thin film electronic components with large, tuneable, capacitor-like and inductor-like characteristics. The resulting simple equivalent circuit model, which we verified with time-dependent drift-diffusion simulations of measured impedance spectra, allows a general description and interpretation of perovskite solar cell behaviour.

Item Type:Articles
Additional Information:We thank the EPSRC for funding this work (EP/J002305/1, EP/M025020/1, EP/M014797/1, EP/L016702/1, EP/P02484X/1, EP/R020574/1, EP/R023581/1). I. G. and E. P. would like to thank the MINECO for the CTQ2016-80042-R project. E. P. also acknowledges AGAUR for the SGR project 2014 SGR 763 and ICREA for financial support.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Docampo, Dr Pablo
Authors: Moia, D., Gelmetti, I., Calado, P., Fisher, W., Stringer, M., Game, O., Hu, Y., Docampo, P., Lidzey, D., Palomares, E., Nelson, J., and Barnes, P. R.F.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Energy and Environmental Science
Publisher:Royal Society of Chemistry
ISSN:1754-5692
ISSN (Online):1754-5706
Published Online:06 March 2019
Copyright Holders:This journal is © The Royal Society of Chemistry 2019
First Published:First published in Energy & Environmental Science 12(4):1296-1308
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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