Active oxygen highly affects the efficiency and stability of perovskite solar cells(PSCs)owing to the capacity to either passivate defects or decompose perovskite lattice.To better understand the in-depth interaction,...Active oxygen highly affects the efficiency and stability of perovskite solar cells(PSCs)owing to the capacity to either passivate defects or decompose perovskite lattice.To better understand the in-depth interaction,we demonstrate for the first time that photooxidation mechanism in all-inorganic perovskite film dominates the phase deterioration kinetics by forming superoxide species in the presence of light and oxygen,which is significantly different from that in organic-inorganic hybrid and even tin-based perovskites.In all-inorganic perovskites,the superox-ide species prefer to oxidize longer and weaker Pb-I bond to PbO and I_(2),leaving the much stable CsPbBr_(3) phase.From this chemical proof-of-concept,we employ an organic bioactive factor,Tanshinone IIA,as a superoxide sweeper to enhance the environmental tolerance of inorganic perovskite,serving as a“skincare”agent for anti-aging organisms.Combined with another key point on healing defective lattice,the best carbon-based all-inorganic CsPbI_(2)Br solar cell delivers an efficiency as high as 15.12%and superior stability against oxygen,light,humid-ity,and heat attacks.This method is also applicable to enhance the efficiency of p-i-n inverted(Cs_(0.05)MA_(0.05)FA_(0.9))Pb(I_(0.93)Br_(0.07))_(3)cell to 23.46%.These findings not only help us understand the perovskite decomposition mechanisms in depth but also provide a potential strategy for advanced PSC platforms.展开更多
基金National Natural Science Foundation of China,Grant/Award Numbers:22109053,62374105,22179051Special Fund of Taishan Scholar Program of Shandong Province,Grant/Award Number:tsqnz20221141Open Project Program of Wuhan National Laboratory for Optoelectronics,Grant/Award Number:2022WNLOKF005。
文摘Active oxygen highly affects the efficiency and stability of perovskite solar cells(PSCs)owing to the capacity to either passivate defects or decompose perovskite lattice.To better understand the in-depth interaction,we demonstrate for the first time that photooxidation mechanism in all-inorganic perovskite film dominates the phase deterioration kinetics by forming superoxide species in the presence of light and oxygen,which is significantly different from that in organic-inorganic hybrid and even tin-based perovskites.In all-inorganic perovskites,the superox-ide species prefer to oxidize longer and weaker Pb-I bond to PbO and I_(2),leaving the much stable CsPbBr_(3) phase.From this chemical proof-of-concept,we employ an organic bioactive factor,Tanshinone IIA,as a superoxide sweeper to enhance the environmental tolerance of inorganic perovskite,serving as a“skincare”agent for anti-aging organisms.Combined with another key point on healing defective lattice,the best carbon-based all-inorganic CsPbI_(2)Br solar cell delivers an efficiency as high as 15.12%and superior stability against oxygen,light,humid-ity,and heat attacks.This method is also applicable to enhance the efficiency of p-i-n inverted(Cs_(0.05)MA_(0.05)FA_(0.9))Pb(I_(0.93)Br_(0.07))_(3)cell to 23.46%.These findings not only help us understand the perovskite decomposition mechanisms in depth but also provide a potential strategy for advanced PSC platforms.
