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

Lookup NU author(s): Dr Pablo Docampo



This is the authors' accepted manuscript of an article that has been published in its final definitive form by Royal Society of Chemistry, 2019.

For re-use rights please refer to the publisher's terms and conditions.


© 2019 The Royal Society of Chemistry. 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.

Publication metadata

Author(s): Moia D, Gelmetti I, Calado P, Fisher W, Stringer M, Game O, Hu Y, Docampo P, Lidzey D, Palomares E, Nelson J, Barnes PRF

Publication type: Article

Publication status: Published

Journal: Energy and Environmental Science

Year: 2019

Volume: 12

Issue: 4

Pages: 1296-1308

Print publication date: 01/04/2019

Online publication date: 06/03/2019

Acceptance date: 05/03/2019

Date deposited: 23/05/2019

ISSN (print): 1754-5692

ISSN (electronic): 1754-5706

Publisher: Royal Society of Chemistry


DOI: 10.1039/c8ee02362j


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