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• W3209281548 abstract "Abstract Outstanding photovoltaic (PV) materials combine a set of advantageous properties including large optical absorption and high charge carrier mobility, facilitated by small effective masses. Halide perovskites (ABX 3 , where X = I, Br, or Cl) are among the most promising PV materials. Their optoelectronic properties are governed by the BX bond, which is responsible for the pronounced optical absorption and the small effective masses of the charge carriers. These properties are frequently attributed to the n s 2 configuration of the B atom, i.e., Pb 6s 2 or Sn 5s 2 (“lone‐pair”) states. The analysis of the PV properties in conjunction with a quantum‐chemical bond analysis reveals a different scenario. The BX bond differs significantly from ionic, metallic, or conventional 2c2e covalent bonds. Instead it is better regarded as metavalent, since it shares about one p‐electron between adjacent atoms. The resulting σ‐bond, formally a 2c1e bond, is half‐filled, causing pronounced optical absorption. Electron transfer between B and X atoms and lattice distortions open a moderate bandgap resulting in charge carriers with small effective masses. Hence, metavalent bonding explains favorable PV properties of halide perovskites, as summarized in a map for different bond types, which provides a blueprint to design PV materials." @default.
• W3209281548 created "2021-11-08" @default.
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• W3209281548 date "2021-10-23" @default.
• W3209281548 modified "2023-10-18" @default.
• W3209281548 title "Halide Perovskites: Advanced Photovoltaic Materials Empowered by a Unique Bonding Mechanism" @default.
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• W3209281548 doi "https://doi.org/10.1002/adfm.202110166" @default.
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