使用乙基肼甲酸盐抑制二价锡氧化以实现高性能全钙钛矿叠层太阳能电池

All-perovskite tandem solar cells(ATSCs)have the potential to surpass the Shockley-Queisser efficiency limit of con-ventional single-junction devices.However,the performance and stability of mixed tin-lead(Sn-Pb)perovskite solar cells(PSCs),which are crucial components of ATSCs,are much lower than those of lead-based perovskites.The primary challenges include the high crystallization rate of perovskite materials and the susceptibility of Sn2+oxidation,which leads to rough mor-phology and unfavorable p-type self-doping.To address these issues,we introduced ethyl hydrazine oxalate(EDO)at the per-ovskite interface,which effectively inhibits the oxidation of Sn2+and simultaneously enhances the crystallinity of the per-ovskite.Consequently,the EDO-modified mixed tin-lead PSCs reached a power conversion efficiency(PCE)of 21.96％with high reproducibility.We further achieved a 27.58％efficient ATSCs by using EDO as interfacial passivator in the Sn-Pb PSCs.