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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, PRF
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.
Issue Date: 1-Apr-2019
Date of Acceptance: 5-Mar-2019
URI: http://hdl.handle.net/10044/1/74103
DOI: https://dx.doi.org/10.1039/c8ee02362j
ISSN: 1754-5692
Publisher: Royal Society of Chemistry
Start Page: 1296
End Page: 1308
Journal / Book Title: Energy and Environmental Science
Volume: 12
Issue: 4
Copyright Statement: ┬ęThe Royal Society of Chemistry 2019.
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: Science & Technology
Physical Sciences
Technology
Life Sciences & Biomedicine
Chemistry, Multidisciplinary
Energy & Fuels
Engineering, Chemical
Environmental Sciences
Chemistry
Engineering
Environmental Sciences & Ecology
ORGANOMETAL TRIHALIDE PEROVSKITE
THIN-FILM
RECOMBINATION
POLARIZATION
EFFICIENCY
MIGRATION
LENGTHS
ORIGIN
Science & Technology
Physical Sciences
Technology
Life Sciences & Biomedicine
Chemistry, Multidisciplinary
Energy & Fuels
Engineering, Chemical
Environmental Sciences
Chemistry
Engineering
Environmental Sciences & Ecology
ORGANOMETAL TRIHALIDE PEROVSKITE
THIN-FILM
RECOMBINATION
POLARIZATION
EFFICIENCY
MIGRATION
LENGTHS
ORIGIN
physics.app-ph
physics.app-ph
cond-mat.mtrl-sci
Energy
Publication Status: Published
Online Publication Date: 2019-03-06
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences