3 years ago

High-Purity Inorganic Perovskite Films for 9.72%-Efficiency Solar Cells

Yuanyuan Zhao, Qunwei Tang, Benlin He, Jialong Duan
The all-inorganic perovskite solar cells with high efficiency and improved stability are promising for commercialization. We demonstrate here a multi-step solution-processed method to fabricate high-purity inorganic CsPbBr3 perovskite films for efficient solar cells. By tuning deposition cycle (n) of CsBr solution, the phase conversion among CsPb2Br5 (n ≤ 3), CsPbBr3 (n = 4) and Cs4PbBr6 (n ≥ 5) is optimized to achieve vertical and monolayer-aligned grains. Upon interfacial modification by graphene quantum dots, the hole transporting layer (HTL)-free all-inorganic perovskite solar cell achieves a power conversion efficiency as high as 9.72% under standard solar illumination. When suffering persistent attack by 90% relative humidity at 25 oC or 80 oC at zero humidity, the optimal device remains 87% over 130 days or 95% over 40 days of initial efficiency.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201800019

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