Extrinsic ion migration in perovskite solar cells

Zhen Li, Chuanxiao Xiao, Ye Yang, Steven P. Harvey, Dong Hoe Kim, Jeffrey A. Christians, Mengjin Yang, Philip Schulz, Sanjini U. Nanayakkara, Chun Sheng Jiang, Joseph M. Luther, Joseph J. Berry, Matthew C. Beard, Mowafak M. Al-Jassim, Kai Zhu