Nanoscale Bandgap Tuning across an Inhomogeneous Ferroelectric Interface

Jing Wang; Houbing Huang; Wangqiang He; Qinghua Zhang; Danni Yang; Yuelin Zhang; Renrong Liang; Chuanshou Wang; Xingqiao Ma; Lin Gu; Longqing Chen; Ce Wen Nan; Jinxing Zhang

doi:10.1021/acsami.7b05138

Nanoscale Bandgap Tuning across an Inhomogeneous Ferroelectric Interface

Jing Wang, Houbing Huang, Wangqiang He, Qinghua Zhang, Danni Yang, Yuelin Zhang, Renrong Liang, Chuanshou Wang, Xingqiao Ma, Lin Gu, Longqing Chen, Ce Wen Nan, Jinxing Zhang

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Abstract

We report nanoscale bandgap engineering via a local strain across the inhomogeneous ferroelectric interface, which is controlled by the visible-light-excited probe voltage. Switchable photovoltaic effects and the spectral response of the photocurrent were explored to illustrate the reversible bandgap variation (∼0.3 eV). This local-strain-engineered bandgap has been further revealed by in situ probe-voltage-assisted valence electron energy-loss spectroscopy (EELS). Phase-field simulations and first-principle calculations were also employed for illustration of the large local strain and the bandgap variation in ferroelectric perovskite oxides. This reversible bandgap tuning in complex oxides demonstrates a framework for the understanding of the optically related behaviors (photovoltaic, photoemission, and photocatalyst effects) affected by order parameters such as charge, orbital, and lattice parameters.

Original language	English (US)
Pages (from-to)	24704-24710
Number of pages	7
Journal	ACS Applied Materials and Interfaces
Volume	9
Issue number	29
DOIs	https://doi.org/10.1021/acsami.7b05138
State	Published - Jul 26 2017

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Materials Science(all)

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10.1021/acsami.7b05138

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title = "Nanoscale Bandgap Tuning across an Inhomogeneous Ferroelectric Interface",

abstract = "We report nanoscale bandgap engineering via a local strain across the inhomogeneous ferroelectric interface, which is controlled by the visible-light-excited probe voltage. Switchable photovoltaic effects and the spectral response of the photocurrent were explored to illustrate the reversible bandgap variation (∼0.3 eV). This local-strain-engineered bandgap has been further revealed by in situ probe-voltage-assisted valence electron energy-loss spectroscopy (EELS). Phase-field simulations and first-principle calculations were also employed for illustration of the large local strain and the bandgap variation in ferroelectric perovskite oxides. This reversible bandgap tuning in complex oxides demonstrates a framework for the understanding of the optically related behaviors (photovoltaic, photoemission, and photocatalyst effects) affected by order parameters such as charge, orbital, and lattice parameters.",

author = "Jing Wang and Houbing Huang and Wangqiang He and Qinghua Zhang and Danni Yang and Yuelin Zhang and Renrong Liang and Chuanshou Wang and Xingqiao Ma and Lin Gu and Longqing Chen and Nan, {Ce Wen} and Jinxing Zhang",

note = "Funding Information: The work at Beijing Normal University is supported by the NSFC under Contract 51332001 and the National Key Research and Development Program of China through Contract 2016YFA0302300. J.Z. also acknowledges the support from the National Basic Research Program of China, under Contract 2014CB920902. H.H. acknowledges the support from NSFC under Contract 11504020. The work at Beijing Normal University is also supported by The Fundamental Research Funds for the Central Universities under Contracts 2017EYT26 and 2017STUD25. The effort at Penn State is supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award FG02-07ER46417. Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

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AU - Huang, Houbing

AU - He, Wangqiang

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AU - Zhang, Yuelin

AU - Liang, Renrong

AU - Wang, Chuanshou

AU - Ma, Xingqiao

AU - Gu, Lin

AU - Chen, Longqing

AU - Nan, Ce Wen

AU - Zhang, Jinxing

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PY - 2017/7/26

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N2 - We report nanoscale bandgap engineering via a local strain across the inhomogeneous ferroelectric interface, which is controlled by the visible-light-excited probe voltage. Switchable photovoltaic effects and the spectral response of the photocurrent were explored to illustrate the reversible bandgap variation (∼0.3 eV). This local-strain-engineered bandgap has been further revealed by in situ probe-voltage-assisted valence electron energy-loss spectroscopy (EELS). Phase-field simulations and first-principle calculations were also employed for illustration of the large local strain and the bandgap variation in ferroelectric perovskite oxides. This reversible bandgap tuning in complex oxides demonstrates a framework for the understanding of the optically related behaviors (photovoltaic, photoemission, and photocatalyst effects) affected by order parameters such as charge, orbital, and lattice parameters.

AB - We report nanoscale bandgap engineering via a local strain across the inhomogeneous ferroelectric interface, which is controlled by the visible-light-excited probe voltage. Switchable photovoltaic effects and the spectral response of the photocurrent were explored to illustrate the reversible bandgap variation (∼0.3 eV). This local-strain-engineered bandgap has been further revealed by in situ probe-voltage-assisted valence electron energy-loss spectroscopy (EELS). Phase-field simulations and first-principle calculations were also employed for illustration of the large local strain and the bandgap variation in ferroelectric perovskite oxides. This reversible bandgap tuning in complex oxides demonstrates a framework for the understanding of the optically related behaviors (photovoltaic, photoemission, and photocatalyst effects) affected by order parameters such as charge, orbital, and lattice parameters.

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Nanoscale Bandgap Tuning across an Inhomogeneous Ferroelectric Interface

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