Figure 7: KPFM results for open-circuit conditions.
From: Real-space observation of unbalanced charge distribution inside a perovskite-sensitized solar cell
(a) CPD line profiles for open-circuit conditions on illumination compared with dark short-circuit conditions. Both arrows indicate the charging of the respective electrodes, ΔCPD~800 mV. The dotted lines correspond to the interfaces of the solar cell. (b) Three-dimensional (3D) visualization of electrical potential change for open-circuit conditions with Au electrode floating. The magnitude of the CPD is plotted in 3D to visualize changes on illumination within the perovskite capping layer. The colour overlay corresponds to the topography. Here, illumination was switched on and off two times and ΔCPD is indicated by an arrow.
