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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

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Title: Ionic-to-electronic current amplification in hybrid perovskite solar cells: Ionically gated transistor-interface circuit model explains hysteresis and impedance of mixed conducting devices
Authors: Moia, D
Gelmetti, I
Calado, P
Fisher, W
Stringer, M
Game, O
Hu, Y
Docampo, P
Lidzey, D
Palomares, E
Nelson, J
Barnes, P
Item Type: Journal Article
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.
Date of Acceptance: 5-Mar-2019
URI: http://hdl.handle.net/10044/1/67398
DOI: https://dx.doi.org/10.1039/C8EE02362J
ISSN: 1754-5692
Publisher: Royal Society of Chemistry
Journal / Book Title: Energy and Environmental Science
Copyright Statement: This paper is embargoed until 12 months after publication.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/J002305/1
EP/R511547/1
EP/R020574/1
PO 500215639
Keywords: MD Multidisciplinary
Energy
Publication Status: Accepted
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences



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