铕-铕离子氧化还原穿梭机制赋予了铅-碘钙钛矿太阳能电池运行耐久性。
A Eu-Eu ion redox shuttle imparts operational durability to Pb-I perovskite solar cells.
作者信息
Wang Ligang, Zhou Huanping, Hu Junnan, Huang Bolong, Sun Mingzi, Dong Bowei, Zheng Guanghaojie, Huang Yuan, Chen Yihua, Li Liang, Xu Ziqi, Li Nengxu, Liu Zheng, Chen Qi, Sun Ling-Dong, Yan Chun-Hua
机构信息
Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, Key Laboratory for the Physics and Chemistry of Nanodevices, Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R. China.
Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR.
出版信息
Science. 2019 Jan 18;363(6424):265-270. doi: 10.1126/science.aau5701.
The components with soft nature in the metal halide perovskite absorber usually generate lead (Pb) and iodine (I) defects during device fabrication and operation. These defects serve as not only recombination centers to deteriorate device efficiency but also degradation initiators to hamper device lifetimes. We show that the europium ion pair Eu-Eu acts as the "redox shuttle" that selectively oxidized Pb and reduced I defects simultaneously in a cyclical transition. The resultant device achieves a power conversion efficiency (PCE) of 21.52% (certified 20.52%) with substantially improved long-term durability. The devices retained 92% and 89% of the peak PCE under 1-sun continuous illumination or heating at 85°C for 1500 hours and 91% of the original stable PCE after maximum power point tracking for 500 hours, respectively.
金属卤化物钙钛矿吸收层中性质较软的组分在器件制造和运行过程中通常会产生铅（Pb）和碘（I）缺陷。这些缺陷不仅作为复合中心降低器件效率，还作为降解引发剂阻碍器件寿命。我们表明，铕离子对Eu-Eu充当“氧化还原穿梭体”，在循环转变中同时选择性地氧化Pb并还原I缺陷。所得器件实现了21.52%的功率转换效率（PCE）（认证值为20.52%），并具有显著提高的长期耐久性。该器件在1个太阳连续光照或85°C加热1500小时后分别保留了峰值PCE的92%和89%，在最大功率点跟踪500小时后保留了原始稳定PCE的91%。
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