High‐Purity Inorganic Perovskite Films for Solar Cells with 9.72 % Efficiency. (27th February 2018)

• Record Type: Journal Article
• Authors: Duan, Jialong; Zhao, Yuanyuan; He, Benlin; Tang, Qunwei
• Is Part Of: Angewandte Chemie. Volume 130:Number 14(2018)
• Page Start: 3849
• Page End: 3853
• Publication Date: 2018-02-27
• Subjects: Anorganische Perowskit-Solarzellen -- Ladungsextraktion -- Ladungsrekombination -- Mehrstufige Abscheidung -- Stabilität; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201800019
• Languages: English
• ISSNs: 0044-8249

Abstract

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 CsPb2 Br5 ( n ≤3), to CsPbBr3 ( n= 4), and Cs4 PbBr6 ( 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.