Self-driven visible-blind photodetector based on ferroelectric perovskite oxides

作者：Jiankun Li, Chen Ge, Kuijuan Jin, Jianyu Du, Jingting Yang, Huibin Lü, Guozhen Yang · 发表于：Applied Physics Letters · 年份：2017 · DOI：10.1063/1.4979587 · 被引用次数：106 · 研究领域：Perovskite Materials and Applications、Multiferroics and related materials、Ga2O3 and related materials

Ultraviolet photodetectors have attracted considerable interest for a variety of applications in health, industry, and science areas. Self-driven visible-blind photodetectors represent an appealing type of sensor, due to the reduced size and high flexibility. In this work, we employed BaTiO3 (BTO) single crystals with a bandgap of 3.2 eV for the realization of a self-driven ultraviolet detector, by utilizing the ferroelectric properties of BTO. We found that the sign of the photocurrent can be reversed by flipping the ferroelectric polarization, which makes the photodetector suitable for electrical manipulation. The photoelectric performance of this photodetector was systematically investigated in terms of rectification character, stability of short-circuit photocurrent, spectral response, and transient photoelectric response. Particularly, the self-driven photodetectors based on BTO showed an ultrafast response time about 200 ps. It is expected that the present work can provide a route for the design of photodetectors based on ferroelectric oxides.