Origin of Open-Circuit Voltage Losses in Perovskite Solar Cells Investigated by Surface Photovoltage Measurement - Daboczi,M; Hamilton,I; Xu,S; Luke,J; Limbu,S; Lee,J; McLachlan,MA; Lee,K; Durrant,JR; Baikie,ID; Kim,J-S (ACS Applied Materials & Interfaces, 2019)