- 1. 南京理工大学 材料科学与工程学院
- 2. 南京大学物理系 固体微结构物理国家重点实验室
The progress and prospects of photocatalytic devices with perovskite ferroelectric semiconductors
- Received Date:
26 February 2020
Abstract: There are two type of perovskites, i.e ABO3-type oxides and ABX3-type (X=F, Cl, Br and I) halides. Both of them exhibit rich physical properties and excellent photoelectric properties, such as ferroelectric and photocatalytic properties. This paper introduces the preparation methods of ferroelectric semiconductor (i.e. BiFeO3 and MAPbI3) and their heterogeneous junctions for photocatalytic application, and summarizes the research progress and applications of photocatalytic devices. Various researches about oxide photocatalytic devices have been carried out. At first, several methods have been develped to absorb more visible light, such as reducing the band gap of ferroelectric materials, preparing junction composed of ferroelectric layer and light absorption layer with narrow-bandgap semiconductor, and growing nanosheet, nanorods or other nanostructures with large specific surface areas. Second, some electric fields are introduced to effectively separate light activated electron-holes pairs. In addition to external electric field, an inner electric field can be introduced through the ferroelectric polarization perpendicular to the surface and/or the energy band bending at the ferroelectric/semiconductor interface. Thirdly, the degradation of dyes, the decomposition of water into hydrogen and the conversion of CO2 into fuel have been realized in many photocatalytic or photoelectrocatalytic devices. Fourthly, the synergies of ferroelectric, pyroelectric and piezoelectric effects can largely increase the photocatalytic efficiency and the energy conversion efficiency. Furthermore, MaPbI3 and other halogen perovskites show excellent semiconductor properties, such as the long carrier diffusion length and long minority carrier lifetime which may originate from ferroelectric dipoles. MAPbI3 can be applied in photocatalytic devices with a high energy conversion efficiency by optimizing the photocatalytic multi-layer structure and adding a package layer that prevents electrolyte to decomposite MAPbI3. Finally, we analyze the challenges of the high-efficiency photocatalytic devices and look forward to their application prospects.