Application of Conductive Polymer in TiO₂-Based UV Photodetectors: A Review

Wide band gap TiO 2 with high light absorption coefficient, high crystallinity, and high carrier mobility is widely used to assemble ultraviolet photodetectors (UV PDs) with high performance. Based on the strong attractiveness from its advantages such as high stability and excellent photoelectric properties, the construction of high-performance TiO 2 -based UV PDs has been extensively developed. Conducting polymers with high carrier mobility and good electrical conductivity can make up for the shortcomings of TiO 2 -based UV PDs to achieve efficient TiO 2 -based UV PDs with high photoelectric performances. In this paper, we present an in-depth review of the preparation process of TiO 2 with conducting polymers and their complexes and introduce the principle, classification, and main evaluation parameters of UV PDs. In addition, this paper reviews that TiO 2 /polymer UV PDs have exhibited different optoelectronic properties (responsivity, switching ratio, detectivity, response time, etc.). Finally, it looks at the future of TiO 2 -based UV PDs research and the major challenges that need to be addressed, particularly that of further functional applications. This review lays the foundation for solving current technical problems and provides insights into the preparation of a more efficient TiO 2 /conductive polymer for future photovoltaic applications.