This is part of my presentation at
Gordon Research Conference: Electron Donor-Acceptor Interactions, Newport, USA, August 3-8, 2014
It is a short illustration of the capacitive currents that may be very significant for perovskite solar cells.
Recently Hui-Seon Kim and Nam-Gyu Park have argued similarly in
Parameters Affecting I–V Hysteresis of CH3NH3PbI3 Perovskite Solar Cells: Effects of Perovskite Crystal Size and Mesoporous TiO2 Layer