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Ionic Behavior of Organic-Inorganic Metal Halide Perovskite Based Metal-Oxide-Semiconductor Capacitors

Abstract

Organic–inorganic metal halide perovskites are promising semiconductors for optoelectronic applications. Despite the achievements in device performance, the electrical properties of perovskites have stagnated. Ion migration is speculated to be the main contributing factor for the many unusual electrical phenomena in perovskite-based devices. Here, to understand the intrinsic electrical behavior of perovskites, we constructed metal-oxide-semiconductor (MOS) capacitors based on perovskite films and performed capacitance–voltage (C–V) and current–voltage (I–V) measurements of the capacitors. The results provide direct evidence of the mixed ionic–electronic transport behavior within perovskite films. In the dark, there is electrical hysteresis in both the C–V and I–V curves because the mobile negative ions take part in charge transport despite frequency modulation. However, under illumination, the large amount of photoexcited free carriers screens the influence of the mobile ions with low concentration, which is responsible for the normal C–V properties. Validation of ion migration in the gate-control ability of MOS capacitors is also helpful for investigation of perovskite MOS transistors and other gate-control photovoltaic devices.

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Publication details

The article was received on 21 Mar 2017, accepted on 19 Apr 2017 and first published on 20 Apr 2017


Article type: Paper
DOI: 10.1039/C7CP01799E
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Ionic Behavior of Organic-Inorganic Metal Halide Perovskite Based Metal-Oxide-Semiconductor Capacitors

    Y. Wang, Y. Zhang, T. Pang, J. Xu, Z. Hu, Y. Zhu, X. Tang, S. Luan and R. Jia, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP01799E

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