Monolithic perovskite-silicon tandem solar cells(PSTs)represent a promising avenue for surpassing the efficiency limits of single-junction photovoltaics,but their performance is still hampered by significant open-circ...Monolithic perovskite-silicon tandem solar cells(PSTs)represent a promising avenue for surpassing the efficiency limits of single-junction photovoltaics,but their performance is still hampered by significant open-circuit voltage(V_(OC))losses arising from interfacial inefficient charge extraction and non-radiative recombination.To mitigate these losses,we introduce a push–pull bridging molecule,4′-amino-[1,1′-bi phenyl]-4-carboxylic acid(ABBA),which forms a 2 PACz/ABBA assembly through phosphor-amidate.The 2 PACz/ABBA assembly suppresses 2 PACz aggregation caused byπ-πstacking while simultaneously enhancing the interfacial dipole moment,thereby facilitating the built-in electric field to promote more efficient hole extraction.Meanwhile,–COOH groups within ABBA passivate deep-level defects(e.g.,uncoordinated Pb^(2+))at buried perovskite interface and contribute to the growth of perovskite films with large grains,reduced residual stress,and optimized energy level alignment.Consequently,the champion tandem device fabricated via the two-step sequential vapor-solution process achieves a PCE of 30.37% and an open-circuit voltage(V_(OC))of 1.891 V.Furthermore,unencapsulated devices maintain 88%of their initial performance after 1000 h under maximum power point tracking(MPPT),highlighting its superior stability.展开更多
基金supported by the National Key Research and Development Program of China(No.2023YFB4202501)the National Natural Science Foundation of China(No.62274026)+1 种基金the Sichuan Science and Technology Program(No.2024NSFSC0216)the Fundamental Research Funds for the Central Universities of China(ZYGX2025XT010 and ZYGX2025TS005)。
文摘Monolithic perovskite-silicon tandem solar cells(PSTs)represent a promising avenue for surpassing the efficiency limits of single-junction photovoltaics,but their performance is still hampered by significant open-circuit voltage(V_(OC))losses arising from interfacial inefficient charge extraction and non-radiative recombination.To mitigate these losses,we introduce a push–pull bridging molecule,4′-amino-[1,1′-bi phenyl]-4-carboxylic acid(ABBA),which forms a 2 PACz/ABBA assembly through phosphor-amidate.The 2 PACz/ABBA assembly suppresses 2 PACz aggregation caused byπ-πstacking while simultaneously enhancing the interfacial dipole moment,thereby facilitating the built-in electric field to promote more efficient hole extraction.Meanwhile,–COOH groups within ABBA passivate deep-level defects(e.g.,uncoordinated Pb^(2+))at buried perovskite interface and contribute to the growth of perovskite films with large grains,reduced residual stress,and optimized energy level alignment.Consequently,the champion tandem device fabricated via the two-step sequential vapor-solution process achieves a PCE of 30.37% and an open-circuit voltage(V_(OC))of 1.891 V.Furthermore,unencapsulated devices maintain 88%of their initial performance after 1000 h under maximum power point tracking(MPPT),highlighting its superior stability.
