Scalable fabrication of efficient wide-bandgap(WBG)perovskite solar cells(PSCs)is crucial to realize the full commercial potential of tandem solar cells.However,there are challenges in fabricating efficient methylammo...Scalable fabrication of efficient wide-bandgap(WBG)perovskite solar cells(PSCs)is crucial to realize the full commercial potential of tandem solar cells.However,there are challenges in fabricating efficient methylammonium-free(MA-free)WBG PSCs by blade coating,especially its phase separation and films stability.In this work,an MA-free WBG perovskite ink is developed for preparing FA_(0.8)Cs_(0.2)Pb(I_(0.75)Br_(0.25))_(3)films by blade coating in ambient air.Among various A-site iodides,RbI is found to be the most effective in suppressing the precipitation of PbI_(2)induced by Pb(SCN)_(2)while keeping the enlarged grains.The distribution of Rb suggested that the Rb ions are kept isolated with the perovskite grains during the crystallization and Ostwald ripening processes,which contributes to the formation of the large-grain WBG perovskite film with minimum non-radiative recombination.As a result,a power conversion efficiency(PCE)of 23.0%was achieved on small-area WBG PSCs,while mini-modules with an aperture area of 10.5 cm^(2)exhibited a PCE of 20.2%,among the highest reported for solar cells prepared with WBG perovskites via blade coating.This work presents a scalable and reproducible fabrication strategy for stable MA-free WBG PSCs under ambient conditions,advancing their path toward commercialization.展开更多
基金supported by the National Natural Science Foundation of China(No.62204211)the Australian Research Council(ARC)Discovery Early Career Researcher Award Fellowship(DE230100163)+1 种基金support of the Henry Royce Institute for Advanced Materials through the Industrial Collaboration Programme and MATcelerateZero(EPSRC Grant EP/X527257/1)support for the NEXTCCUS project(Project ID:327327)from the Department for Energy Security and Net Zero,the ACT program,and Horizon 2020(Project No.691712).
文摘Scalable fabrication of efficient wide-bandgap(WBG)perovskite solar cells(PSCs)is crucial to realize the full commercial potential of tandem solar cells.However,there are challenges in fabricating efficient methylammonium-free(MA-free)WBG PSCs by blade coating,especially its phase separation and films stability.In this work,an MA-free WBG perovskite ink is developed for preparing FA_(0.8)Cs_(0.2)Pb(I_(0.75)Br_(0.25))_(3)films by blade coating in ambient air.Among various A-site iodides,RbI is found to be the most effective in suppressing the precipitation of PbI_(2)induced by Pb(SCN)_(2)while keeping the enlarged grains.The distribution of Rb suggested that the Rb ions are kept isolated with the perovskite grains during the crystallization and Ostwald ripening processes,which contributes to the formation of the large-grain WBG perovskite film with minimum non-radiative recombination.As a result,a power conversion efficiency(PCE)of 23.0%was achieved on small-area WBG PSCs,while mini-modules with an aperture area of 10.5 cm^(2)exhibited a PCE of 20.2%,among the highest reported for solar cells prepared with WBG perovskites via blade coating.This work presents a scalable and reproducible fabrication strategy for stable MA-free WBG PSCs under ambient conditions,advancing their path toward commercialization.
