The all-inorganic lead halide perovskite without volatile component would be a promising alternative candidate for high efficiency photovoltaics. However, the all inorganic CsPbI3 with most suitable band gap face the challenges of low room temperature phase stability and relative low efficiency. To enhance the performance and stability of all-inorganic CsPbI3 perovskite, the 2D/3D configuration especially the (110) oriented 2D perovskite component was introduced to stabilize the α-CsPbI3. The (110) oriented 2D based on EDAPbI4 help stabilize α-CsPbI3 to achieve up to &gt;11% efficiency. Interestingly, the Cs cation in CsPbI3 would not ion exchanged with organic cation,therefore a facile organic cation surface termination approach was developed to significantly enhance the stability and performance of α-CsPbI3 solar cell with &gt;15% efficiency. The bifunctional stabilization of CsPbI3 with gradient Br doping and organic cation termination finally improve the efficiency of CsPbI3 perovskite solar cells to a record value of 17%. Recently, we had further push the efficiency up to &gt;18%.

High-efficiency inorganic CsPbI3 perovskite solar cells

2019 Fall National Meeting

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