Chen Yihua, Yang Ning, Zheng Guanhaojie, Pei Fengtao, Zhou Wentao, Zhang Yu, Li Liang, Huang Zijian, Liu Guilin, Yin Ruiyang, Zhou Huanping, Zhu Cheng, Song Tinglu, Hu Chun, Zheng Dezhi, Bai Yang, Duan Ye, Ye Yakuan, Wu Yiliang, Chen Qi
School of Materials Science and Engineering, Beijing Institute of Technology (Zhuhai), Beijing Institute of Technology, Beijing 100081, P. R. China.
Shanghai Synchrotron Radiation Facility (SSRF), Zhangjiang Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, P. R. China.
Science. 2024 Aug 2;385(6708):554-560. doi: 10.1126/science.ado9104. Epub 2024 Aug 1.
Wide-bandgap (WBG) absorbers in tandem configurations suffer from poor crystallinity and weak texture, which leads to severe mixed halide-cation ion migration and phase segregation during practical operation. We control WBG film growth insensitive to compositions by nucleating the 3C phase before any formation of bromine-rich aggregates and 2H phases. The resultant WBG absorbers show improved crystallinity and strong texture with suppressed nonradiative recombination and enhanced resistance to various aging stresses. Perovskite/silicon tandem solar cells achieve power conversion efficiencies of 29.4% (28.8% assessed by a third party) in a 25-square centimeter active area and 32.5% in a 1-square centimeter active area. These solar cells retained 98.3 and 90% of the original efficiency after 1301 and 800 hours of operation at 25° and 50°C, respectively, at the maximum power point (AM 1.5G illumination, full spectrum, 1-sun) when encapsulated.
串联结构中的宽带隙（WBG）吸收层存在结晶性差和织构薄弱的问题，这导致在实际运行过程中严重的混合卤化物阳离子迁移和相分离。我们通过在富溴聚集体和2H相形成之前使3C相成核，来控制对成分不敏感的WBG薄膜生长。所得的WBG吸收层显示出改善的结晶性和较强的织构，同时抑制了非辐射复合，并增强了对各种老化应力的抗性。在25平方厘米的有源面积中，钙钛矿/硅串联太阳能电池实现了29.4%的功率转换效率（第三方评估为28.8%），在1平方厘米的有源面积中实现了32.5%的功率转换效率。在最大功率点（AM 1.5G光照，全光谱，1个太阳）下封装后，这些太阳能电池在25℃和50℃分别运行1301小时和800小时后，分别保留了原始效率的98.3%和90%。
