Cesium iodide (CsI) is attracting attention as a substitute for organic materials such as CH 3 NH 3 I. In this work, we fabricated sequential-vacuum-deposited planar heterojunction (PHJ) cesium lead iodide (CsPbI 3 ) perovskite solar cells with enhanced efficiencies by varying the annealing time (0.5, 1, 5, and 10 min). The effect of performance enhancement was investigated as a function of varying annealing time at 350 °C employing a hot plate. The best-performing device was obtained with an annealing time of 1 min, delivered photocurrent density ( J SC ) of 12.06 mA/cm 2 , voltage ( V OC ) of 0.71 V, and fill factor (FF) of 0.67, leading to a power conversion efficiency (PCE) of 5.71% at standard AM 1.5G solar illumination.
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Yonezawa et al. (2017) studied this question.
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