Wide-Bandgap Perovskite and Perovskite/Silicon Tandem Solar Cells through Strong Hydrogen Bonding Interaction
Cong Sun, Lü Jin, Xinjiang Wang, Biao Shi, Pengyang Wang, Ningyu Ren, Xiaojing Han, Lizetong Sun, Zhao Zhou Zhu, Qian Huang, Shengzhi Xu, Ying Zhao, Lijun Zhang, Xiaodan Zhang
Abstract
Enhancing the crystallization quality of wide-bandgap perovskite film is vital to raise the open-circuit voltage ( V OC ) and performance of the device. Based on this, we present an approach involving the incorporation of 4-morpholino formamidine hydrochloride (MFC) as an additive in the antisolvent to facilitate crystal growth through the strong hydrogen bonding interactions and concurrently mitigate the deep-level defects. With this method, we can obtain increased grain size and achieve a transition toward a more n-type surface, which synergistically results in favorable carrier transport and reduced carrier recombination. Consequently, we were able to obtain an efficiency of 23.13% for 1.68 eV-inverted perovskite solar cells (PSCs) and 30.65% with a V OC of 1.951 V for the two-terminal perovskite/silicon tandem solar cells (TSCs) while maintaining long-term stability. This additive approach provides a fresh perspective in wide-bandgap PSCs and further pushes the development of perovskite/silicon TSCs.