Inorganic perovskite absorbers are promising candidates for next-generation photovoltaics due to their good thermal and light stabilities.Halide-mixed Cs Pb I_(x)Br_(3-x)reach a compromise between its structural toler...Inorganic perovskite absorbers are promising candidates for next-generation photovoltaics due to their good thermal and light stabilities.Halide-mixed Cs Pb I_(x)Br_(3-x)reach a compromise between its structural tolerance and absorption edge,yet the power conversion efficiencies(PCEs)of the asfabricated cells can be considerably limited by the nonideal quality of solution-processed films.Here we demonstrated a fumigation strategy on colloidal perovskite films using dualO-donor ethyl acetate(EA).By in-situ monitoring this stage with grazing-incidence wide-angle X-ray scattering technology,we reveal that EA fumigation would impose ripening barrier on colloidal inorganic perovskites and hence slow down the nucleation rate,leading to an intermediate state for processing high-crystallinity and oriented perovskite films with improved photophysical properties.An optimized PCE of 16.6%was finally yielded upon wide-bandgap(1.9 eV)perovskite absorber.展开更多
基金financially supported by the National Ten Thousand Talent Program for Young Top-notch Talentthe National Natural Science Fund for Excellent Young Scholars (52022030)+5 种基金the National Natural Science Fund for Distinguished Young Scholars (51725201)the National Natural Science Foundation of China (51972111 and 51902185)the International (Regional) Cooperation and Exchange Projects of the National Natural Science Foundation of China (51920105003)the Innovation Program of Shanghai Municipal Education Commission (E00014)the Fundamental Research Funds for the Central Universities (JKD012016025 and JKD012016022)Shanghai Engineering Research Center of Hierarchical Nanomaterials (18DZ2252400)
文摘Inorganic perovskite absorbers are promising candidates for next-generation photovoltaics due to their good thermal and light stabilities.Halide-mixed Cs Pb I_(x)Br_(3-x)reach a compromise between its structural tolerance and absorption edge,yet the power conversion efficiencies(PCEs)of the asfabricated cells can be considerably limited by the nonideal quality of solution-processed films.Here we demonstrated a fumigation strategy on colloidal perovskite films using dualO-donor ethyl acetate(EA).By in-situ monitoring this stage with grazing-incidence wide-angle X-ray scattering technology,we reveal that EA fumigation would impose ripening barrier on colloidal inorganic perovskites and hence slow down the nucleation rate,leading to an intermediate state for processing high-crystallinity and oriented perovskite films with improved photophysical properties.An optimized PCE of 16.6%was finally yielded upon wide-bandgap(1.9 eV)perovskite absorber.
