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• W3207217853 endingPage "2107729" @default.
• W3207217853 startingPage "2107729" @default.
• W3207217853 abstract "Sn-Pb mixed perovskites with bandgaps in the range of 1.1-1.4 eV are ideal candidates for single-junction solar cells to approach the Shockley-Queisser limit. However, the efficiency and stability of Sn-Pb mixed-perovskite solar cells (PSCs) still lag far behind those of Pb-based counterparts due to the easy oxidation of Sn2+ . Here, a reducing agent 4-hydrazinobenzoic acid is introduced as an additive along with SnF2 to suppress the oxidation of Sn2+ . Meanwhile, a vertical Pb/Sn compositional gradient is formed spontaneously after an antisolvent treatment due to different solubility and crystallization kinetics of Sn- and Pb-based perovskites and it can be finely tuned by controlling the antisolvent temperature. Because the band structure of a perovskite is dependent on its composition, graded vertical heterojunctions are constructed in the perovskite films with a compositional gradient, which can enhance photocarrier separation and suppress carrier recombination in the resultant PSCs. Under optimal fabrication conditions, the Sn-Pb mixed PSCs show power conversion efficiency up to 22% along with excellent stability during light soaking." @default.
• W3207217853 created "2021-10-25" @default.
• W3207217853 creator A5003248254 @default.
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• W3207217853 date "2021-12-22" @default.
• W3207217853 modified "2023-10-15" @default.
• W3207217853 title "High‐Performance Tin–Lead Mixed‐Perovskite Solar Cells with Vertical Compositional Gradient" @default.
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• W3207217853 doi "https://doi.org/10.1002/adma.202107729" @default.
• W3207217853 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34676933" @default.
• W3207217853 hasPublicationYear "2021" @default.
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