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Planar CH3NH3PbI3 perovskite solar cells with constant 17.2% average power conversion efficiency irrespective of the scan rate are described. These properties are attributed to the formation of a pure CH3 NH3 PbI3 thin film by the introduction of a HI solution. Thereby, charge‐injection/separation efficiency, charge‐collection efficiency, diffusion coefficient, carrier lifetime, and traps are improved...
An HI additive enables single‐crystalline perovskite thin‐films to be formed and reduces trap density, thereby reducing hysteresis and enhancing device performance. S. H. Im and co‐workers develop highly efficient planar CH3NH3PbI3 perovskite hybrid solar cells with constant average power conversion efficiency irrespective of scan rate, as described on page 3424.
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