[21p-C202-1~8] 17.3 Layered materials

[21p-C202-3] Out-of-plane bulk photovoltaic effect in two-dimensional ferroelectrics CuInP₂S₆

〇Yijin Zhang¹, Rei Taniguchi², Satoru Masubuchi¹, Rai Moriya¹, Kenji Watanabe³, Takashi Taniguchi^1,3, Takao Sasagawa², Tomoki Machida¹ (1.IIS Univ. Tokyo, 2.MSL-Tokyo Tech., 3.NIMS)

Keywords:two-dimensional material, bulk photovoltaic effect, Ferroelectrics

CuInP₂S₆ is one of the ferroelectric two-dimensional materials. It possesses an out-of-plane spontaneous electrical polarization. In this study we fabricated a graphene / CuInP₂S₆ / graphene van der Waals heterostructure and characterized its properties. We succeeded to detect the signal associated with the polarization switching in I-V characteristics, for the first time in nano flakes isolated from the ferroelectric two-dimensional materials. The van der Waals heterostructure device further exhibits the bulk photovoltaic effect. The generated zero-bias photocurrent also changes its direction when the spontaneous electrical polarization of the CuInP₂S₆ nano flake is switched.