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- W2945498213 endingPage "4071" @default.
- W2945498213 startingPage "4063" @default.
- W2945498213 abstract "Lattice compression through hydrostatic pressure has emerged as an effective means of tuning the structural and optoelectronic properties of hybrid halide perovskites. In addition to external pressure, the local strain present in solution-processed thin films also causes significant heterogeneity in their photophysical properties. However, an atomistic understanding of structural changes of hybrid perovskites under pressure and their effects on the electronic landscape is required. Here, we use high level ab initio simulation techniques to explore the effect of lattice compression on the formamidinium (FA) lead iodide compound, FA1-x Cs x PbI3 (x = 0, 0.25). We show that, in response to applied pressure, the Pb-I bonds shorten, the PbI6 octahedra tilt anisotropically, and the rotational dynamics of the FA+ molecular cation are partially suppressed. Because of these structural distortions, the compressed perovskites exhibit band gaps that are narrower (red-shifted) and indirect with spin-split band edges. Furthermore, the shallow defect levels of intrinsic iodide defects transform to deep-level states with lattice compression. This work highlights the use of hydrostatic pressure as a powerful tool for systematically modifying the photovoltaic performance of halide perovskites." @default.
- W2945498213 created "2019-05-29" @default.
- W2945498213 creator A5010880306 @default.
- W2945498213 creator A5017072462 @default.
- W2945498213 creator A5023096949 @default.
- W2945498213 creator A5024135658 @default.
- W2945498213 creator A5033978022 @default.
- W2945498213 date "2019-05-14" @default.
- W2945498213 modified "2023-10-15" @default.
- W2945498213 title "Putting the Squeeze on Lead Iodide Perovskites: Pressure-Induced Effects To Tune Their Structural and Optoelectronic Behavior" @default.
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