UV soaking for enhancing the photocurrent and response speed of Cs2AgBiBr6-based all-inorganic perovskite photodetectors

The response speed of the reported Cs2AgBiBr6-based photodetectors exhibits a wide variation ranging from microseconds to nanoseconds, while reason is still unclear. Apart conventional approaches such as reducing effective area, new regulating for improvement have rarely been reported. On other hand, it generally believed that ultraviolet (UV) light has negative impact on perovskite devices resulting in performance degradation. In this work, we demonstrated photodetector with FTO/Cs2AgBiBr6/Au structure can be effectively regulated by utilizing UV light-soaking effect without device area. Particularly, decay time efficiently modulated 30.1 µs 340 ns. addition, −3 dB bandwidth extended 5 20 kHz. It worth mentioning current remarkably boosted 15 times instead any attenuation. Furthermore, prove universality soaking treatment all-inorganic structures, i.e., FTO/TiO2/Cs2AgBiBr6/Au, FTO/Cs2AgBiBr6/TiO2/Au and FTO/TiO2/Cs2AgBiBr6/CuSCN/Au. Our results demonstrate method improve photodetectors.