3 years ago

Nanoscale Bandgap Tuning across an Inhomogeneous Ferroelectric Interface

Nanoscale Bandgap Tuning across an Inhomogeneous Ferroelectric Interface
Ce-Wen Nan, Jing Wang, Danni Yang, Jinxing Zhang, Xingqiao Ma, Qinghua Zhang, Longqing Chen, Lin Gu, Chuanshou Wang, Yuelin Zhang, Wangqiang He, Houbing Huang, Renrong Liang
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.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b05138

DOI: 10.1021/acsami.7b05138

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