[21p-W641-1~19] 6.1 Ferroelectric thin films

[21p-W641-1] [Young Scientist Presentation Award Speech] Photovoltaic Properties under Visible Light Illumination for Heavily-Manganese-Doped LiNbO₃ Thin Films

〇Atsushi Inuzuka¹, Shusuke Takahashi¹, Ryotaro Inoue², Yuji Noguchi¹, Masaru Miyayama¹ (1.Univ. of Tokyo, 2.Nihon Univ.)

Keywords:ferroelectrics,thin films,photovoltaic properties

Single-crystalline thin films of heavily-manganese-doped lithium niobate were prepared by a pulsed laser deposition method and the photovoltaic properties have been investigated under visible light illumination. We demonstrate that the remarkable photovoltaic voltage beyond 90 V arises from visible light absorption and subsequent charge separation through occupied gap states originating from Mn^Ⅱ_Li and Mn^Ⅲ_Nb. In addition, we will report the photovoltaic properties of the thin films prepared under different heat-treatment conditions.