Ultraviolet(UV) photodetectors(PDs) can monitor UV radiation, enabling it to be effective for many applications, such as communication, imaging and sensing. The rapid progress on portable and wearable optoelectronic devices places a great demand on self-powered PDs. However, high-performance self-powered PDs are still limited. Herein we display a transparent and self-powered PD based on a p-CuI/n-TiO2 heterojunction, which exhibits a high on-off ratio (similar to 10(4) at 310 nm) and a fast response speed (rise time/decay time = 0.11 ms/0.72 ms) without bias. Moreover, the device shows an excellent UV-selective sensitivity as a solar-blind UV PD with a high UV/visible rejection ratio (R (300 nm)/R (400 nm) = 5.3 x 10(2)), which can be ascribed to the wide bandgaps of CuI and TiO2. This work provides a feasible route for the construction of transparent, self-powered PDs based on p-n heterojunctions.
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