α/β phase junction Ga2O3 based high-performance self-powered deep ultraviolet photodetectors with Ti3C2/Ag nanowire hybrid conductive electrode.

Gallium oxide (Ga 2 O 3) semiconductor has attracted increasingly interested in the optoelectronic field, due to the wide bandgap of 4.9 eV. However, the fabrication of Ga 2 O 3 pn junction is still an enormous challenge since p-Ga 2 O 3 doping technology is in its infancy. Taking into consideration the α -Ga 2 O 3 and β -Ga 2 O 3 with comparable band gap structure, a solar-blind photodetector was constructed by the vertical α / β -Ga 2 O 3 junction nanorod arrays (NRAs) with a top electrode for a Ti 3 C 2 -silver nanowires (Ag NWs). Compared to a standard metal electrode, the Ti 3 C 2 -Ag NWs electrode with tight coupling of the α / β -Ga 2 O 3 demonstrated outstanding conductivity and optical transparency, optimizing the photodetector with excellent photoelectric performance. Meanwhile, the photogenerated carriers were easier to automatically separate and transfer to their corresponding electrodes because of the internal electric field of the α / β -Ga 2 O 3 phase junction could drive the photogenerated charge transfer, promoting the photogenerated electrons transfer. Even without external power, the photodetector demonstrated improved performance, large detectivity of 1.45 × 1014 Jones, and high responsivity of 5.2 mA/W. The solar-blind photodetector with self-powered shows high photoelectric performance, which has prospective applications in space missile detection, UV communication, and deep ultraviolet light monitoring. • A high performance solar-blind photodetector was built based on α / β -Ga 2 O 3 junction nanorods with Ti 3 C 2 -Ag NWs top electrode. • The highly improved electrical conductivity of the Ti 3 C 2 -Ag NWs can be attributed to synergy from percolation by the Ag NWs. • Ti 3 C 2 -Ag NWs electrode exhibits highly electrical conductivity and UV transmittance. • Comparison with the device of the α -Ga 2 O 3 and β -Ga 2 O 3 , the phase junction photodetector shows enhanced performance. [ABSTRACT FROM AUTHOR]