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

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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 languageEnglish (US)
Pages (from-to)24704-24710
Number of pages7
JournalACS Applied Materials and Interfaces
Volume9
Issue number29
DOIs
StatePublished - Jul 26 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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