期刊
ACS APPLIED ENERGY MATERIALS
卷 6, 期 19, 页码 9994-10004出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.3c01580
关键词
interface; multifunctionaleffect; perovskitesolar cells; defect passivation; KH2PO4
This study presents a method to enhance the interface between SnO2 and perovskite, which plays a crucial role in achieving high-efficiency perovskite solar cells. The optimized SnO2/perovskite interface shows reduced defect states and improved energy level alignment, resulting in impressive power conversion efficiency and stability for the PSCs.
An electron transport layer (ETL)/perovskite interface with abundant defects and energy level mismatch can lead to severe nonradiative recombination and reduce the efficiency in perovskite solar cells (PSCs). Thus, achieving an excellent ETL/perovskite interface is crucial for the development of high-efficiency PSCs. Herein, we present a method to enhance the interface between SnO2 and the perovskite using an inorganic phosphate compound with appropriate functional groups. By leveraging the multifunctional effects of Sn4+ and Pb2+ ions and P=O bonds, as well as the formation of hydrogen bonds between the perovskite and phosphate, we successfully engineered an exceptional interface characterized by a reduced number of defect states and improved energy level alignment. The optimization of the SnO2/perovskite interface led to an impressive power conversion efficiency of 21.84% for methylammonium lead triiodide (MAPbI(3)) PSCs, with improved stability in the air environment. The findings of our work present an effective strategy for modifying the ETL/perovskite interface with suitable functional groups for high-performance and stable PSCs.
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