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Mobile ions in hybrid perovskite semiconductors introduce a new degree offreedom to electronic devices suggesting applications beyond photovoltaics. Anintuitive device model describing the interplay between ionic and electroniccharge transfer is needed to unlock the full potential of the technology. Wedescribe the perovskite-contact interfaces as transistors which couple ioniccharge redistribution to energetic barriers controlling electronic injectionand recombination. This reveals an amplification factor between the out ofphase electronic current and the ionic current. Our findings suggest a strategyto design thin film electronic components with large, tuneable, capacitor-likeand inductor-like characteristics. The resulting simple equivalent circuitmodel, which we verified with time-dependent drift-diffusion simulations ofmeasured impedance spectra, allows a general description and interpretation ofperovskite solar cell behaviour.

energy and environmental science

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