Self-powered ultraviolet photovoltaic effects based on metal/SrTiO3Schottky junctions K. X. Jin, Y. Zhang, B. C. Luo, J. Y. Wang, C. L. Chen and T. Wu EPL, 103 5 (2013) 57007 Published online: 23 September 2013 DOI: 10.1209/0295-5075/103/57007