An
ultraviolet (UV) photodetector (PD) is an indispensable element
in the field of optoelectronics. However, the current PDs often need
high driving voltages, which hinder the continued development of the
devices. P–n junctions have been used in the construction of
self-powered UVPDs. In this work, we fabricated a self-powered UVPD
based on the CuI/TiO2 nanostructured film. To investigate
the effects of the 80 nm thick CuI film on the device performance,
we compared the performance of UVPDs based on the CuI/TiO2 film and TiO2 film. Compared with the TiO2 PD, the CuI/TiO2 PD showed self-powered performance with
an on–off ratio of 103 and a peak responsivity of
28 mA W–1 at 330 nm. It is worth noting that the
CuI/TiO2 device demonstrated a fast photo-response time
of 35 ms and a decay time of 40 ms. The uniform CuI-nanostructured
film spin-coated on the TiO2 film constructs a built-in
field with the TiO2 film to separate the photogenerated
carriers and transport them to both sides of the CuI/TiO2 nanostructured heterojunction, which is the main reason for the
self-powered performance of the CuI/TiO2 UVPD. These results
provide a feasible means for the development of heterojunction self-powered
UVPDs.
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