High‐Purity Inorganic Perovskite Films for Solar Cells with 9.72 % Efficiency |
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| Authors: | Dr Jialong Duan Dr Yuanyuan Zhao Prof Benlin He Prof Qunwei Tang |
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| Affiliation: | 1. Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou, P. R. China;2. School of Materials Science and Engineering, Ocean University of China, Qingdao, P. R. China;3. Joint Laboratory for Deep Blue Fishery Engineering, Qingdao National Laboratory for Marine Science and Technology, Qingdao, P. R. China |
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| Abstract: | All‐inorganic perovskite solar cells with high efficiency and improved stability are promising for commercialization. A multistep solution‐processing method was developed to fabricate high‐purity inorganic CsPbBr3 perovskite films for use in efficient solar cells. By tuning the number of deposition cycles (n) of a CsBr solution, the phase conversion from CsPb2Br5 (n ≤3), to CsPbBr3 (n=4), and Cs4PbBr6 (n≥5) was optimized to achieve vertical‐ and monolayer‐aligned grains. Upon interfacial modification with graphene quantum dots, the all‐inorganic perovskite solar cell (without a hole‐transporting layer) achieved a power conversion efficiency (PCE) as high as 9.72 % under standard solar illumination conditions. Under challenging conditions, such as 90 % relative humidity (RH) at 25 °C or 80 °C at zero humidity, the optimized device retained 87 % PCE over 130 days or 95 % over 40 days, compared to the initial efficiency. |
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| Keywords: | all-inorganic perovskite solar cells charge extraction charge recombination multistep deposition stability |
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