Meticulous Design of High‐Polarity Interface Material for FACsPbI <sub>3</sub> Perovskite Solar Cells with Efficiency of 26.47%
Abstract
Abstract Designing new interface materials with the multifunctions of upper film crystallization control, interfacial defects passivation, and interfacial energy level regulation is crucial for developing efficient and stable perovskite solar cells (PSCs). Herein, a high polarity interfacial material, 2‐cyano‐ N,N,N ‐trimethylammonium bromide (CNCB), was synthesized to engineer the buried interface between SnO 2 and perovskite of the PSCs. Comprehensive theoretical and experimental investigations demonstrate that CNCB interacts with perovskite precursors (PbI 2 and FAI) to regulate crystallization kinetics, yielding perovskite films with preferred orientation and reduced defects. Simultaneously, CNCB chemically interacts with both SnO 2 and perovskite surfaces, effectively passivating oxygen vacancies in SnO 2 and undercoordinated Pb 2 ⁺ defects at the perovskite buried surface. Furthermore, the high dipole moment of CNCB induces beneficial interfacial polarization, optimizing energy level alignment and suppressing non‐radiative recombination. The CNCB‐modified FACsPbI 3 PSCs achieve a champion power conversion efficiency (PCE) of 26.47% with exceptional operational stability, retaining 87.14% of their initial efficiency after 1000 h of continuous 1‐sun illumination. This work establishes a molecular design paradigm for multifunctional interfacial materials in perovskite optoelectronics, highlighting the synergistic roles of crystallization control, defect passivation, and dipole engineering in high‐performance devices.
Article Details
Authors (16)
Yongzhe Li
Linlin Dong
Yan Cai
Yong Li
Dongfang Xu
Hongjie Lei
Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory For Advanced Energy Devices Shaanxi Engineering Lab For Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an China
Nan Li
Zihao Fan
Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China
Jieke Tan
Rui Sun
Borui Wang
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P.R. China
Jinyun Gong
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P.R. China
Zilu Lin
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P.R. China
Kunpeng Guo
Ministry of Education Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Taiyuan Shanxi 030024 P.R. China
Xuexia He
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P.R. China
Zhike Liu