Jump to main content
Jump to site search

Issue 5, 2016
Previous Article Next Article

Grain boundary dominated ion migration in polycrystalline organic–inorganic halide perovskite films

Author affiliations

Abstract

The efficiency of perovskite solar cells is approaching that of single-crystalline silicon solar cells despite the presence of a large grain boundary (GB) area in the polycrystalline thin films. Here, by using a combination of nanoscopic and macroscopic level measurements, we show that ion migration in polycrystalline perovskites dominates through GBs. Atomic force microscopy measurements reveal much stronger hysteresis both for photocurrent and dark-current at the GBs than on the grain interiors, which can be explained by faster ion migration at the GBs. The dramatically enhanced ion migration results in the redistribution of ions along the GBs after electric poling, in contrast to the intact grain area. The perovskite single-crystal devices without GBs show negligible current hysteresis and no ion-migration signal. The discovery of dominating ion migration through GBs in perovskites can lead to broad applications in many types of devices including photovoltaics, memristors, and ion batteries.

Graphical abstract: Grain boundary dominated ion migration in polycrystalline organic–inorganic halide perovskite films

Back to tab navigation

Supplementary files

Publication details

The article was received on 09 Feb 2016, accepted on 21 Mar 2016 and first published on 21 Mar 2016


Article type: Paper
DOI: 10.1039/C6EE00413J
Citation: Energy Environ. Sci., 2016,9, 1752-1759
  •   Request permissions

    Grain boundary dominated ion migration in polycrystalline organic–inorganic halide perovskite films

    Y. Shao, Y. Fang, T. Li, Q. Wang, Q. Dong, Y. Deng, Y. Yuan, H. Wei, M. Wang, A. Gruverman, J. Shield and J. Huang, Energy Environ. Sci., 2016, 9, 1752
    DOI: 10.1039/C6EE00413J

Search articles by author

Spotlight

Advertisements