Fang Zheng, Deng Bingru, Jin Yongbin, Yang Liu, Chen Lisha, Zhong Yawen, Feng Huiping, Yin Yue, Liu Kaikai, Li Yingji, Zhang Jinyan, Huang Jiarong, Zeng Qinghua, Wang Hao, Yang Xing, Yang Jinxin, Tian Chengbo, Xie Liqiang, Wei Zhanhua, Xu Xipeng
Ministry of Education Engineering Research Center for Brittle Materials Machining, Institute of Manufacturing Engineering, College of Mechanical Engineering and Automation, Huaqiao University, Xiamen, 361021, PR China.
Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing, Institute of Luminescent Materials and Information Displays, College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, PR China.
Nat Commun. 2024 Dec 4;15(1):10554. doi: 10.1038/s41467-024-54925-4.
Wide-bandgap perovskite solar cells (WBG-PSCs) are critical for developing perovskite/silicon tandem solar cells. The defect-rich surface of WBG-PSCs will lead to severe interfacial carrier loss and phase segregation, deteriorating the device's performance. Herein, we develop a surface reconstruction method by removing the defect-rich crystal surface by nano-polishing and then passivating the newly exposed high-crystallinity surface. This method can refresh the perovskite/electron-transporter interface and release the residual lattice strain, improving the charge collection and inhibiting the ion migration of WBG perovskites. As a result, we can achieve certified efficiencies of 23.67% and 21.70% for opaque and semi-transparent PSCs via a 1.67-eV perovskite absorber. Moreover, we achieve four-terminal perovskite/silicon tandem solar cells with a certified efficiency of 33.10% on an aperture area of one square centimeter.
宽带隙钙钛矿太阳能电池（WBG-PSCs）对于开发钙钛矿/硅串联太阳能电池至关重要。WBG-PSCs富含缺陷的表面会导致严重的界面载流子损失和相分离，从而降低器件性能。在此，我们开发了一种表面重构方法，通过纳米抛光去除富含缺陷的晶体表面，然后对新暴露的高结晶度表面进行钝化。该方法可以刷新钙钛矿/电子传输体界面并释放残余晶格应变，改善电荷收集并抑制WBG钙钛矿的离子迁移。结果，通过1.67 eV的钙钛矿吸收层，我们可以实现不透明和半透明PSCs的认证效率分别为23.67%和21.70%。此外，我们在一平方厘米的孔径面积上实现了认证效率为33.10%的四端钙钛矿/硅串联太阳能电池。
