CsPbI_(3)perovskites with suitable bandgaps∼1.70 eV present distinct advantages for top-cell photovoltaic materials in tandem solar cells,however,relevant work has been rarely reported.This work designed a sandwich-l...CsPbI_(3)perovskites with suitable bandgaps∼1.70 eV present distinct advantages for top-cell photovoltaic materials in tandem solar cells,however,relevant work has been rarely reported.This work designed a sandwich-like MoO_(X)/Ag/MoO_(X)(MAM)buffer layer as the front cell window layer to maximize incident light utilization efficiency for semi-transparent CsPbI_(3)solar cells and four terminal(4-T)stacked cells.Further investigation revealed that the MAM has to experience in-situ reaction between Ag metal and fresh MoO_(X),which can simultaneously ensure the transparency of the buffer layer and improve the carrier transportation and collection,except for protecting the underlying spiro-OMeTAD layer from the bombardment of magnetron sputtering.Thanks to this MAM buffer layer and a tunnel oxide passivating contact(TOPCon)bottom cell with edge passivation,semi-transparent CsPbI_(3)devices(aperture area:0.50 cm^(2))demonstrated a power conversion efficiency(PCE)of 18.86%while corresponding 4-T CsPbI_(3)/TOPCon tandem solar cells(PSTSCs)presented the PCE of 26.55%.Besides,we also fabricated semi-transparent CsPbI_(3)minimodules with 16.67%PCE and 4-T PSTSCs with 26.41%PCE(aperture area:6.62 cm^(2)).This work provided a new scalable strategy for transparent buffer layers by constructing in-situ generated sandwich structured buffer layer,which is suitable for perovskite tandem solar cells.展开更多
基金support from CAS-CSIRO Joint Project(112111KYSB20210017)Natural Science Foundation of China(Nos.52361145847,52172260,52227803,U24A6003,52203368,52222212)the National Key R&D Program of China(2021YFB3800103).
文摘CsPbI_(3)perovskites with suitable bandgaps∼1.70 eV present distinct advantages for top-cell photovoltaic materials in tandem solar cells,however,relevant work has been rarely reported.This work designed a sandwich-like MoO_(X)/Ag/MoO_(X)(MAM)buffer layer as the front cell window layer to maximize incident light utilization efficiency for semi-transparent CsPbI_(3)solar cells and four terminal(4-T)stacked cells.Further investigation revealed that the MAM has to experience in-situ reaction between Ag metal and fresh MoO_(X),which can simultaneously ensure the transparency of the buffer layer and improve the carrier transportation and collection,except for protecting the underlying spiro-OMeTAD layer from the bombardment of magnetron sputtering.Thanks to this MAM buffer layer and a tunnel oxide passivating contact(TOPCon)bottom cell with edge passivation,semi-transparent CsPbI_(3)devices(aperture area:0.50 cm^(2))demonstrated a power conversion efficiency(PCE)of 18.86%while corresponding 4-T CsPbI_(3)/TOPCon tandem solar cells(PSTSCs)presented the PCE of 26.55%.Besides,we also fabricated semi-transparent CsPbI_(3)minimodules with 16.67%PCE and 4-T PSTSCs with 26.41%PCE(aperture area:6.62 cm^(2)).This work provided a new scalable strategy for transparent buffer layers by constructing in-situ generated sandwich structured buffer layer,which is suitable for perovskite tandem solar cells.
