Ferroelectrically modulated and enhanced photoresponse of a Ag/PZT/NSTO self-powered photodetector in the ultraviolet range
JOURNAL OF MATERIALS CHEMISTRY C(2024)
Abstract
Ultraviolet (UV) photodetectors possess the capability to convert UV light into electrical signals, rendering them of great interest in various applications. The self-powered and tunable UV photodetectors have garnered considerable attention. In this study, self-powered Ag/PbZr0.2Ti0.8O3(PZT)/Nb-doped SrTiO3 (NSTO) heterojunction photodetectors are prepared, and their ultraviolet photoresponse can be effectively modulated and enhanced by ferroelectric polarization. The highest responsivity and detectivity can reach 7.4 x 10-4 A W-1 and 7.4 x 109 Jones at -5 V VP (polarization voltage), marking enhancements of 1487.5% and 20 556% compared to the values obtained at +5 V VP, respectively. This improvement can be attributed to the modulation of the built-in field at the PZT/NSTO interface by ferroelectric polarization, which facilitates the separation and transport of photo-generated carriers. Additionally, the heterojunction exhibits a switchable diode effect modulated by ferroelectric polarization. This work elucidates the relationship between the photoresponse and the polarization states of PZT and offers a promising strategy for the development of self-powered ultraviolet photodetectors that can be modulated and enhanced by the ferroelectric effect. The photoelectric response of Ag/PZT/NSTO ultraviolet (UV) photodetectors is modulated through the manipulation of the polarization state of a PZT ultrathin film.
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