Ionic-to-electronic current amplification in hybrid perovskite solar cells: ionically gated transistor-interface circuit model explains hysteresis and impedance of mixed conducting devices
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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DOI：
10.1039/c8ee02362j
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发表时间：
2019-04-01
影响因子：
32.5
通讯作者：
Barnes, Piers R. F.
中科院分区：
文献类型：
--
作者：
Moia, Davide;Gelmetti, Ilario;Barnes, Piers R. F.
混合钙钛矿半导体中的移动离子为电子设备带来了新的自由度，这意味着光电以外的应用。需要一个直观的设备模型来描述离子和电子电荷转移之间的相互作用，以释放该技术的全部潜力。我们将钙钛矿接触界面描述为将离子电荷再分配与控制电子注入和复合的能垒耦合的晶体管。这揭示了异相电流和离子电流之间的放大因子。我们的研究结果提出了一种设计具有大型、可调谐、类似电容器和类似电感特性的薄膜电子元件的策略。我们用测量阻抗谱的随时间漂移扩散模拟验证了所得的简单等效电路模型，该模型可以对钙钛矿太阳能电池的行为进行一般描述和解释。
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.