The Nature of Ion Conduction in Methylammonium Lead Iodide: A Multimethod Approach

被引：228

作者：

Senocrate, Alessandro ^{[1
]}

Moudrakovski, Igor ^{[1
]}

Kim, Gee Yeong ^{[1
]}

Yang, Tae-Youl ^{[1
]}

Gregori, Giuliano ^{[1
]}

Graetzel, Michael ^{[1
,2
]}

Maier, Joachim ^{[1
]}

机构：

[1] Max Planck Inst Solid State Res, Dept Phys Chem Solids, Heisenbergstr 1, D-70569 Stuttgart, Germany

[2] Swiss Fed Inst Technol, Dept Chem & Chem Engn, Stn 6, CH-1015 Lausanne, Switzerland

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2017年 / 56卷 / 27期

关键词：

charge carriers; halide perovskite; ion migration; methylammonium lead iodide; perovskite solar cells; PEROVSKITE SOLAR-CELLS; HALIDE PEROVSKITES; HYSTERESIS; MIGRATION; TRANSPORT; DEGRADATION; CH3NH3PBI3; DYNAMICS; LAYERS; NMR;

D O I：

10.1002/anie.201701724

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

By applying a multitude of experimental techniques including H-1, N-14, Pb-207 NMR and I-127 NMR/NQR, tracer diffusion, reaction cell and doping experiments, as well as stoichiometric variation, conductivity, and polarization experiments, iodine ions are unambiguously shown to be the mobile species in CH3NH3PbI3, with iodine vacancies shown to represent the mechanistic centers under equilibrium conditions. Pb2+ and CH3NH3+ ions do not significantly contribute to the long range transport (upper limits for their contributions are given), whereby the latter exhibit substantial local motion. The decisive electronic contribution to the mixed conductivity in the experimental window stems from electron holes. As holes can be associated with iodine orbitals, local variations of the iodine stoichiometry may be fast and enable light effects on ion transport.

引用

页码：7755 / 7759

页数：5

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