Addendum: Solution epitaxy of polarization-gradient ferroelectric oxide films with colossal photovoltaic current

oleh: Chen Lin, Zijun Zhang, Zhenbang Dai, Mengjiao Wu, Shi Liu, Jialu Chen, Chenqiang Hua, Yunhao Lu, Fei Zhang, Hongbo Lou, Hongliang Dong, Qiaoshi Zeng, Jing Ma, Xiaodong Pi, Dikui Zhou, Yongjun Wu, He Tian, Andrew M. Rappe, Zhaohui Ren, Gaorong Han