Figure 5: Photovoltaic and junction performances.
From: Efficient hole-blocking layer-free planar halide perovskite thin-film solar cells

(a) J–V curves of the best-performing cell composed of UVO-treated FTO/500 nm CH3NH3PbI3-xClx/spiro-OMeTAD/Au under AM1.5 simulated irradiation (closed red squares) and in the dark (open black squares). (b) IPCE spectrum of the best-performing cell composed of UVO-treated FTO/500 nm CH3NH3PbI3-xClx/spiro-OMeTAD/Au. (c) The linear curve of the relationship of −dV/dJ and (JSC−J)−1. (d) The plot of the relationship of ln(JSC−J) and V+RSJ. The junction properties are based on the best-performing cell. The red lines are best linear fits to the data.