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- W4386407151 abstract "Abstract Though Sn‐Pb alloyed perovskite solar cells (PSCs) achieved great progress, there is a dilemma to further increase Sn for less‐Pb requirement. High Sn ratio (>70%) perovskite exhibits nonstoichiometric Sn:Pb:I at film surface to aggravate Sn 2+ oxidation and interface energy mismatch. Here, ternary metal alloyed (FASnI 3 ) 0.7 (MAPb 1− x Zn x I 3 ) 0.3 ( x = 0–3%) is constructed for Pb% < 30% perovskite. Zn with smaller ionic size and stronger ionic interaction than Sn/Pb assists forming high‐quality perovskite film with ZnI 6 4− enriched at surface to balance Sn:Pb:I ratio. Differing from uniform bulk doping, surface‐rich Zn with lower lying orbits pushes down the energy band of perovskite and adjusts the interface energy for efficient charge transfer. The alloyed PSC realizes efficiency of 19.4% at AM1.5 (one of the highest values reported for Pb% < 30% PSCs). Moreover, stronger bonding of Zn─I and Sn─I contributes to better durability of ternary perovskite than binary perovskite. This work highlights a novel alloy method for efficient and stable less‐Pb PSCs." @default.
- W4386407151 created "2023-09-05" @default.
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- W4386407151 date "2023-09-03" @default.
- W4386407151 modified "2023-10-16" @default.
- W4386407151 title "Ternary‐Metal Sn‐Pb‐Zn Perovskite to Reconstruct Top Surface for Efficient and Stable Less‐Pb Perovskite Solar Cells" @default.
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- W4386407151 doi "https://doi.org/10.1002/smll.202305736" @default.
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