CuTiO3/TiO2 MSM UV Photodetector with a Type-I Heterojunction for Rapid and Low-Power Detection

Abstract

Dark current and response speed matter a lot in UV detection. TiO₂ MSM UV detectors offer many positive attributes, including chemical stability and excellent absorption in the UV region. However, they also have a high dark current and a poor response time. To get around these drawbacks, an MSM UV detector based on the CuTiO₃/TiO₂ type-I heterojunction was created in this work. The introduction of high-dielectric perovskite CuTiO₃ reduces carriers and thus leads to a low dark current (8.06 × 10^–12 A). Furthermore, type-I heterojunction properties of the CuTiO₃/TiO₂ heterojunction significantly restrict the recombination process of photogenerated carriers in TiO₂, improving response and recovery times (78 and 93 ms). The findings suggested that high-performance UV photodetectors might be created by combining conventional wide-band-gap semiconductor materials with high-dielectric perovskite CuTiO₃.