Enhanced photovoltaic currents in strained Fe‐doped LiNbO3 films

This is the authors' abstract. We don't add key points for this paper.

We investigate the impact of strain on photovoltaic current (Jz) characteristics for iron‐doped LiNbO3 (Fe‐LN) under visible light illumination by thin‐film experiments. The Jz values are demonstrated to be dramatically enhanced for the film with a tensile strain along the Ps direction, which is over 500 times as large as that of the bulk (strain‐free) Fe‐LN crystals. Density functional theory (DFT) calculations show that the tensile strain increases an off‐center displacement of Fe2+ that is opposite to the Ps direction. Our experimental and DFT study demonstrates that the control of the lattice strain is effective in enhancing the photovoltaic effect in the Fe‐LN system.