Yang Shuai, He Jiandong, Chen Zhihui, Luo Hao, Wei Jinbei, Wei Xuyang, Li Hao, Chen Jiadi, Zhang Weifeng, Wang Jizheng, Wang Shu, Yu Gui
Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Adv Mater. 2024 Nov;36(45):e2408686. doi: 10.1002/adma.202408686. Epub 2024 Sep 6.
Simultaneously controlling defects and film morphology at the buried interface is a promising approach to improve the power conversion efficiency (PCE) of inverted perovskite solar cells (PSCs). Here, two new donor‒acceptor type semiconductive covalent organic frameworks (COFs) are developed, COF and COF. The carefully designed COFs structure not only effectively regulates the morphology and defects of the buried interface film, but also realizes the alignment with the energy level of the perovskite film and enhances the extraction and transmission of the interface charge. Among them, COF-treated inverted PSCs achieved a maxmum PCE of 25.68% (certified 25.14%), the inverted PCE reached a minimum PCE of 22.92% for 1 cm device. The efficiency of inverted PSCs with a 1.68 eV wide bandgap reached 22.92%, which is the highest datum of the reported 1.68 eV wide bandgap PSC. This lays the groundwork for the commercialization of perovskite/silicon tandem solar cells. Additionally, the unencapsulated devices demonstrated a high degree of stability during operational use and when subjected to conditions of high humidity and temperature.
同时控制掩埋界面处的缺陷和薄膜形态是提高倒置钙钛矿太阳能电池（PSC）功率转换效率（PCE）的一种很有前景的方法。在此，开发了两种新型供体-受体型半导体共价有机框架（COF），即COF和COF。精心设计的COF结构不仅有效调节了掩埋界面薄膜的形态和缺陷，还实现了与钙钛矿薄膜能级的匹配，并增强了界面电荷的提取和传输。其中，经COF处理的倒置PSC的最大PCE达到25.68%（认证值为25.14%），对于1 cm的器件，倒置PCE的最小值为22.92%。具有1.68 eV宽带隙的倒置PSC的效率达到22.92%，这是已报道的1.68 eV宽带隙PSC的最高数据。这为钙钛矿/硅串联太阳能电池的商业化奠定了基础。此外，未封装的器件在运行使用期间以及在高湿度和高温条件下表现出高度的稳定性。
