Enhancing ferroelectric photovoltaic effect by polar order engineering
Lü You(Nanyang Technological University), Fan Zheng(University of Pennsylvania), Liang Fang(Soochow University), Zhou Yang(Nanyang Technological University), Liang Z. Tan(University of Pennsylvania), Zeyu Zhang(Shanghai University), Guohong Ma(Shanghai University), Daniel Schmidt(National University of Singapore), Andrivo Rusydi(National University of Singapore), Le Wang(Nanyang Technological University), Lei Chang(Nanyang Technological University), Andrew M. Rappe(University of Pennsylvania), Junling Wang(Nanyang Technological University)
Cited by 225Open Access
Abstract
. As revealed by optical measurements and supported by theoretical calculations, the enhancement is accompanied by the chemically driven rotational instability of the polarization, which, in turn, affects the charge transfer at the band edges and drives a direct-to-indirect bandgap transition, highlighting the strong coupling between polarization, lattice, and orbital order parameters in ferroelectrics. Polar order engineering thus provides an additional degree of freedom to further boost photovoltaic efficiency in ferroelectrics and related materials.
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