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Title: Enhancing ferroelectric photovoltaic effect by polar order engineering
Authors: You, Lu
Zheng, Fan
Fang, Liang
Zhou, Yang
Tan, Liang Z.
Zhang, Zeyu
Ma, Guohong
Schmidt, Daniel
Rusydi, Andrivo
Wang, Le
Chang, Lei
Rappe, Andrew M.
Wang, Junling
Keywords: DRNTU::Engineering::Materials
Photovoltaic Effect
Issue Date: 2018
Source: You, L., Zheng, F., Fang, L., Zhou, Y., Tan, L. Z., Zhang, Z., . . . Wang, J. (2018). Enhancing ferroelectric photovoltaic effect by polar order engineering. Science Advances, 4(7), eaat3438-. doi:10.1126/sciadv.aat3438
Series/Report no.: Science Advances
Abstract: Ferroelectric materials for photovoltaics have sparked great interest because of their switchable photoelectric responses and above-bandgap photovoltages that violate conventional photovoltaic theory. However, their relatively low photocurrent and power conversion efficiency limit their potential application in solar cells. To improve performance, conventional strategies focus mainly on narrowing the bandgap to better match the solar spectrum, leaving the fundamental connection between polar order and photovoltaic effect largely overlooked. We report large photovoltaic enhancement by A-site substitutions in a model ferroelectric photovoltaic material, BiFeO3. 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.
DOI: 10.1126/sciadv.aat3438
Rights: © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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