High performance ultraviolet photodetector based on CsPbCl3/ ZTO heterostructure film enabled by effective separation of photocarriers

Abstract

Ultraviolet photodetectors have gained attention due to their wide range of applications. All-inorganic perovskite, especially CsPbCl3, has become a promising ultraviolet photoelectric detecting material in recent years due to its suitable band gap and excellent optical properties. However, because of the low solubility of CsCl in traditional organic solvents, the CsPbCl3 film quality is poor and its detection performance is limited to improve. During this work, we fabricated a high performance ultraviolet photodetectors based on CsPbCl3/ Zn2SnO4 heterostructure film. The introduction of Zn2SnO4 not only improves the quality of CsPbCl3 films, but also allows the interface charge of CsPbCl3 to be effectively separated. Under the dual action of heterostructure film, the on/ off switching ratio and responsivity of the device are increased by two and one orders of magnitude. In addition, we have successfully manufactured flexible ultraviolet photodetectors based on CsPbCl3/ Zn2SnO4 heterostructure film, and the devices have demonstrated excellent performance on flexible substrates. This work shows that CsPbCl3/ Zn2SnO4 heterostructure film have broad application prospects in the construction of high-performance ultraviolet photodetectors and other photovoltaic devices.