Abstract
An ultrasensitive, fast response and self-powered photodetector would be preferable in practical applications.
Highlights
In recent years, functional nanosystems must be sensitive, controllable and multifunctional, but must have a low power consumption
Characterization SEM image showing the morphology and structure of asfabricated heterojunctions consisting of TiO2 and Fe-doped TiO2 (Fe):TiO2 thin lm/Si wafer via a solution process of spin coating (Fig. 1a and b)
The pure and Fe-doped TiO2 were characterized by X-ray diffraction (XRD)
Summary
Functional nanosystems must be sensitive, controllable and multifunctional, but must have a low power consumption. A fast response speed of 10/15 ms were achieved in the fabricated PDs. Notably, under zero bias, the device exhibited high responsivity of 46 mA WÀ1 (350 nm) and 60 mA WÀ1 (600 nm) with a 0.5 mW cmÀ2 light irradiation.
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