1 research outputs found
Self-Powered Solar-Blind Photodetectors Based on Vertically Aligned GaN@Ga<sub>2</sub>O<sub>3</sub> Core–Shell Nanowire Arrays
The
self-powered photodetector has recently received wide attention
as a fundamental component of energy-saving optoelectronic systems.
In this study, the GaN@Ga2O3 core–shell
nanowire arrays (NAs) were used as the photoanode for the self-powered
solar-blind photoelectrochemical-type photodetectors (PEC-PDs). The
vertically aligned GaN@Ga2O3 core–shell
NAs on the GaN template was fabricated by the inductively coupled
plasma etching combined with the thermal oxidation process. Under
255 nm illumination without an external power supply, the device exhibits
a maximum responsivity of 93.48 mA/W, yielding a high external quantum
efficiency of 45.54%, which shows one of the best values among the
reported solar-blind Ga2O3-based PEC-PDs. Furthermore,
the device shows a fast response speed (Ï„r = 25 ms,
Ï„d = 5 ms) and good stability. Such excellent performance
under zero bias may benefit from the superior light-absorbing capability
of the vertical NAs, the good solid/liquid contact realized by the
nanostructures, and the efficient photogenerated carrier separation
driven by the double built-in electric field. This work provides a
simple and feasible route to construct high-performance solar-blind
Ga2O3-based PEC-PDs