Quantification of light-enhanced ionic transport in lead iodide perovskite thin films and its solar cell applications

Yi-Cheng Zhao; Wen-Ke Zhou; Xu Zhou; Kai-Hui Liu; Da-Peng Yu; Qing Zhao

doi:10.1038/lsa.2016.243

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Quantification of light-enhanced ionic transport in lead iodide perovskite thin films and its solar cell applications

Original Articles

- Quantification of light-enhanced ionic transport in lead iodide perovskite thin films and its solar cell applications
- Light: Science & Applications Vol. 6, Issue 2, (2017)
- Affiliations：
  
  1.State Key Laboratory for Mesoscopic Physics and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China
  2.Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
- Author bio：
  
  KH Liu, Email: khliu@pku.edu.cn
  Q Zhao, Email: zhaoqing@pku.edu.cn
- Funds：
- DOI：10.1038/lsa.2016.243
  CLC：
- Published：2017-06，
  
  Published Online：21 October 2016，
  
  Received：06 July 2016，
  
  Revised：24 September 2016，
  
  Accepted：18 October 2016
- Accepted：
Scan QR Code
Zhao, Y. C. et al. Quantification of light-enhanced ionic transport in lead iodide perovskite thin films and its solar cell applications. Light: Science & Applications, 6, e16243 (2017).
DOI：

Zhao, Y. C. et al. Quantification of light-enhanced ionic transport in lead iodide perovskite thin films and its solar cell applications. Light: Science & Applications, 6, e16243 (2017). DOI： 10.1038/lsa.2016.243.

摘要

Abstract

Ionic transport in organometal halide perovskites is of vital importance because it dominates anomalous phenomena in perovskite solar cells

from hysteresis to switchable photovoltaic effects. However

excited state ionic transport under illumination has remained elusive

although it is essential for understanding the unusual light-induced effects (light-induced self-poling

photo-induced halide segregation and slow photoconductivity response) in organometal halide perovskites for optoelectronic applications. Here

we quantitatively demonstrate light-enhanced ionic transport in CH

PbI

over a wide temperature range of 17–295 K

which reveals a reduction in ionic transport activation energy by approximately a factor of five (from 0.82 to 0.15 eV) under illumination. The pure ionic conductance is obtained by separating it from the electronic contribution in cryogenic galvanostatic and voltage-current measurements. On the basis of these findings

we design a novel light-assisted method of catalyzing ionic interdiffusion between CH

I and PbI

stacking layers in sequential deposition perovskite synthesis. X-ray diffraction patterns indicate a significant reduction of PbI

residue in the optimized CH

PbI

thin film produced via light-assisted sequential deposition

and the resulting solar cell efficiency is increased by over 100% (7.5%–15.7%) with

little PbI

residue. This new method enables fine control of the reaction depth in perovskite synthesis and

in turn

supports light-enhanced ionic transport.

关键词

Keywords

activation energyion migrationlightperovskite

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