The high non-radiative recombination caused by lattice defects and photoinduced phase segregation remains a major challenge hindering the development of wide-bandgap perovskite solar cells(PSCs),severely impairing the...The high non-radiative recombination caused by lattice defects and photoinduced phase segregation remains a major challenge hindering the development of wide-bandgap perovskite solar cells(PSCs),severely impairing their open-circuit voltage(VOC),efficiency,and long-term stability.Herein,we propose a co-passivation strategy to address lattice defects associated with Br-I ions in 1.7 eV bandgap Cs_(0.22)FA_(0.78)PbI_(2.25)Br_(0.75)perovskite material.This approach effectively suppresses surface defects and reduces the non-radiative recombination rate of the perovskite material,increasing the VOC from 1.13 V to a record 1.29 V.Based on this strategy,we achieved a record-breaking efficiency of exceeding 23%for wide-bandgap PSCs.The unencapsulated devices retained 98.5%of their initial efficiency after more than 2000 h of testing at room temperature and maintained over 80%efficiency after 900 h at 85℃.These significant improvements in both efficiency and stability are attributed to targeted passivation against the uneven nucleation unique to wide-bandgap perovskite.By introducing iodine-rich passivators,the imbalanced Br and I distribution in the film was balanced,which provides a promising pathway for enhancing the performance of mixed-halide perovskite materials.展开更多
基金supported by the National Natural Science Foundation of China(52332008,52472166,52422208,U23A20571,52402294,and 52025028)the Excellent Youth Foundation of Jiangsu Science Committee(BK20220118)+1 种基金the Natural Science Foundation of Jiangsu Province(BK20240041)Key University Science Research Project of Jiangsu Province(23KJA430011).
文摘The high non-radiative recombination caused by lattice defects and photoinduced phase segregation remains a major challenge hindering the development of wide-bandgap perovskite solar cells(PSCs),severely impairing their open-circuit voltage(VOC),efficiency,and long-term stability.Herein,we propose a co-passivation strategy to address lattice defects associated with Br-I ions in 1.7 eV bandgap Cs_(0.22)FA_(0.78)PbI_(2.25)Br_(0.75)perovskite material.This approach effectively suppresses surface defects and reduces the non-radiative recombination rate of the perovskite material,increasing the VOC from 1.13 V to a record 1.29 V.Based on this strategy,we achieved a record-breaking efficiency of exceeding 23%for wide-bandgap PSCs.The unencapsulated devices retained 98.5%of their initial efficiency after more than 2000 h of testing at room temperature and maintained over 80%efficiency after 900 h at 85℃.These significant improvements in both efficiency and stability are attributed to targeted passivation against the uneven nucleation unique to wide-bandgap perovskite.By introducing iodine-rich passivators,the imbalanced Br and I distribution in the film was balanced,which provides a promising pathway for enhancing the performance of mixed-halide perovskite materials.
