Molecular coordination-driven interfacial engineering for high-efficiency CsPbI3 perovskite solar cells
Abstract
The intrinsic defects of CsPbI3 significantly degrade the photovoltaic performance of perovskite solar cells. Herein, a multifunctional interfacial modification strategy was developed using the nitrogen-rich heterocyclic molecule 2-hydrazinopyridine (2-HP). The nitrogen atoms of pyridine and hydrazine (-NH-NH2) as active sites can effectively drive coordination with unsaturated Pb2+ ions by Lewis acid–base interaction and anchor iodine-related defects by forming hydrogen bond. This synergistic defect passivation strategy reduced trap-state density and suppressed the defect-induced charge recombination loss. Consequently, the optimal 2-HP-modified CsPbI3 devices achieved a champion power conversion efficiency of 19.08%, corresponding to a 12% enhancement over their unmodified counterparts. This study establishes a practical molecular coordination-driven interfacial engineering approach for realizing high-performance all-inorganic perovskite photovoltaics.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (6)
Siye Lu
State Key Laboratory of Integrated Optoelectronics, JLU Region, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012,
Xiaolong Geng
State Key Laboratory of Integrated Optoelectronics, JLU Region, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012,
Jia Liu
Wenwen Liu
Chunyu Liu
Department of Psychiatry, State University of New York Upstate Medical University
Wenbin Guo