journal article·2017-07-26Open access

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

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.
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Research context

OpenAlex topics: Multiferroics and related materials · Electronic and Structural Properties of Oxides · Ferroelectric and Piezoelectric Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Beijing Normal University, 100875 Beijing, China

Department of Physics, University of Science and Technology Beijing, 100083 Beijing, China

School of Materials Science and Engineering, Tsinghua University, 100084 Beijing, China

Tsinghua National Laboratory for Information Science and Technology, Institute of Microelectronics, Tsinghua University, 100084 Beijing, China

Institute of Physics, Chinese Academy of Science, 100190 Beijing, China

Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China

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