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Title: Crossover between bulk and interface photovoltaic mechanisms in a ferroelectric vertical heterostructure
Authors: Abdelsamie, Amr
You, Lu
Wang, Le
Li, Shuzhou
Gu, Mingqiang
Wang, Junling
Keywords: Engineering::Materials
Issue Date: 2022
Source: Abdelsamie, A., You, L., Wang, L., Li, S., Gu, M. & Wang, J. (2022). Crossover between bulk and interface photovoltaic mechanisms in a ferroelectric vertical heterostructure. Physical Review Applied, 17(2), 024047-1-024047-9.
Project: AcRF Tier 1 189/18 
Journal: Physical Review Applied 
Abstract: The bulk photovoltaic (BPVE) effect in crystals lacking inversion symmetry offers great potential for optoelectronic applications due to its unique properties, such as above-band-gap photovoltage and switchable photocurrent. Because of their large spontaneous polarizations, ferroelectric materials are ideal platforms for studying the BPVE. However, identifying the origin of an experimentally observed photovoltaic response is often challenging due to the entanglement between bulk and interface effects, leading to much debate in the field. This issue is particularly pronounced in vertical heterostructures, where the two effects are comparable. Here, we report crossover between bulk- and interface-dominant responses in vertical BiFeO3 heterostructures when changing the photon energy. We show that well-above-band-gap excitation leads to a bulk photovoltaic response, but band-edge excitation requires interface band bending to separate the photocarriers. Our findings not only help to clarify contradicting reports in the literature, but also lay the foundation for a deeper understanding of the ferroelectric photovoltaic effect and its applications in various devices.
ISSN: 2331-7019
DOI: 10.1103/PhysRevApplied.17.024047
Schools: School of Materials Science and Engineering 
Rights: © 2022 American Physical Society. All rights reserved. This paper was published in Physical Review Applied and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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