Photo-resistance and photo-voltage in epitaxial BiFeO3 thin films Le Wang, Yu-ling Jin, Kui-juan Jin, Can Wang, Hui-bin Lu, Cong Wang, Chen Ge, Xi-yang Chen, Er-jia Guo and Guo-zhen Yang EPL, 96 1 (2011) 17008 Published online: 16 September 2011 DOI: 10.1209/0295-5075/96/17008