High-Performance Ultraviolet Photodetector Based on Organic-Inorganic Hybrid Structure

An ultraviolet (UV) photodetector is fabricated by sandwiching a nanocomposite active layer between charge-selective semiconducting polymers. The nanocomposite active layer composed of TiO2 nanoparticles (NPs) blended with 1,3-bis(N-carbazolyl)benzene (mCP), which acts as a valve controller that enables hole injection into the device upon UV 50 illumination. The UV photodetector demonstrated a high photocurrent to dark current ratio (similar to 10(4)), a large linear dynamic range of 60 dB, and a remarkable external quantum efficiency (similar to 8.5 x 10(4)%) for the UV light at 351 nm. In addition to discussing the performance of the UV photodetector, a general strategy for design and fabrication of high-performance UV photodetectors with hole injection operation mode is suggested.