Effect of oxygen vacancy modulation on the photodetector performance of a single Ga2O3 microwire
Source abstract
Abstract
Highly crystalline Ga 2 O 3 microwires were synthesized on sapphire substrates via a one-step chemical vapor deposition process. The concentration of oxygen vacancies was effectively controlled by adjusting the gas flow rate during growth. Single microwire-based solar-blind photodetectors were fabricated, and their photoelectronic properties were evaluated under different oxygen flow conditions. The device grown under an O 2 flow rate of 2 sccm exhibited exceptional performance. Under a 20 V bias and 255 nm illumination, it achieved a responsivity of 1.17 A/W, with a solar-blind-to-UV rejection ratio of 49.7 and a solar-blind-to-visible rejection ratio of 1.61 × 10 3 . The corresponding external quantum efficiency and specific detectivity were 572 % and 4.6 × 10 12 Jones, respectively. This enhanced performance is attributed to an optimal concentration of oxygen vacancies, which act as donor states to enhance photocurrent, while the high surface area of the microwire promotes an oxygen adsorption–desorption mechanism that improves response speed. This work demonstrates that precise control of oxygen vacancies during growth is a promising strategy for producing high-performance solar-blind photodetectors.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Ga2O3 and related materials · Advanced Photocatalysis Techniques · Copper-based nanomaterials and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (49)
Show source-provided references
1. Solar-blind deep ultraviolet photoelectrochemical detectors: materials, mechanisms, and applications
2. Recent progress in solar-blind photodetectors based on ultrawide bandgap semiconductors10.1021/acsomega.4c02897 ↗
3. Solar-blind imaging based on 2-inch polycrystalline diamond photodetector linear array10.1016/j.carbon.2020.11.013 ↗
4. Ga2O3 based multilevel solar-blind photomemory array with logic, arithmetic, and image storage functions10.1039/D1MH01304A ↗
5. Review of polymorphous Ga2O3 materials and their solar-blind photodetector applications
6. Ultraviolet photodetector based on magnesium-doped zinc oxide film with tunable bandgap10.1117/1.OE.63.11.116103 ↗
7. Significant performance improvement of AlGaN solar-blind heterojunction phototransistors by using Na2S solution based surface treatment10.1016/j.apsusc.2022.153144 ↗
8. High performance diamond-based solar-blind photodetectors enabled by Schottky barrier modulation10.1016/j.carbon.2022.09.001 ↗
9. High-sensitivity and fast-response solar-blind photodetectors via band offset engineering for motion tracking10.1038/s41467-025-63683-w ↗
10. An ultrahigh responsivity (9.7 mA·W−1) self‐powered solar‐blind photodetector based on Individual ZnO–Ga2O3 heterostructures10.1002/adfm.201700264 ↗
11. Gallium oxide solar-blind ultraviolet photodetectors: a review10.1039/C9TC02055A ↗
12. Advances in gallium oxide: properties, applications, and future prospects10.1002/aelm.202400690 ↗
13. A strategic review on gallium oxide based deep‐ultraviolet photodetectors: recent progress and future prospects10.1002/adom.202002160 ↗
14. High-responsivity self-powered solar-blind photodetector based on MoS2/a-InGaZnO/a-Ga2O3 heterojunction10.1016/j.apsusc.2025.163964 ↗
15. Ultra‐fast gallium oxide solar‐blind photodetector with novel thermal pulse treatment
16. New Generation Beta‐gallium oxide nanomaterials: growth and performances in electronic devices10.1002/adem.202300688 ↗
17. One-step preparation of si-doped ultra-long β-Ga2O3 nanowires by low-pressure chemical vapor deposition10.3390/cryst13060898 ↗
18. Structural and morphological properties of β-Ga2O3 nanostructures synthesized at various deposition temperatures10.1016/j.physe.2020.114153 ↗
19. Nano tree-like branched structure with α-Ga2O3 covered by γ-Al2O3 for highly efficient detection of solar-blind ultraviolet light using self-powered photoelectrochemical method10.1016/j.apsusc.2020.148380 ↗
20. Impact of oxygen vacancies on photodetection performance of Ga2O3: a comprehensive review10.1007/s11664-025-11746-5 ↗
21. Doping enhanced optoelectronic properties of Ga2O3 bridging one-dimensional nanostructures: from nanowires to nanobelts10.1007/s11664-025-12075-3 ↗
22. Nanoarchitechtonics of visible‐blind ultraviolet photodetector materials: critical features and nano‐microfabrication
23. α-Ga2O3 nanorod array–Cu2O microsphere p–n Junctions for self-powered spectrum-distinguishable photodetectors10.1021/acsanm.9b00527 ↗
24. Patterned Ga2O3 nanowires synthesized by CVD method for High-performance self-powered ultraviolet photodetector10.1016/j.jallcom.2022.168070 ↗
25. Single β-Ga2O3 microbelt solar-blind photodetector with high specific detectivity, high rejection ratio and fast speed10.1088/1361-6463/ac77c9 ↗
26. X-ray detectors based on Ga2O3 microwires10.3390/ma16134742 ↗
27. Thermodynamics and kinetics of the growth mechanism of vapor–liquid–solid grown nanowires10.1016/j.jcrysgro.2015.04.038 ↗
28. Catalyst‐free vapor-solid deposition growth of β‐Ga2O3 nanowires for DUV photodetector and image sensor application10.1002/adom.201901257 ↗
29. High-performance solar-blind UV photodetector based on single p-type Cu-doped β-Ga2O3 microwire10.1016/j.mssp.2025.109370 ↗
30. An ultrahigh responsivity self-powered solar-blind photodetector based on a centimeter-sized β-Ga2O3/polyaniline heterojunction10.1039/C9NR09095A ↗
31. Nanowires mediated growth of β-Ga2O3 nanobelts for high-temperature (>573 K) solar-blind photodetectors10.1007/s12274-022-5243-0 ↗
32. High-performance β-Ga2O3 solar-blind photodetector with extremely low working voltage10.1109/LED.2021.3108190 ↗
33. Efficient suppression of persistent photoconductivity in β-Ga2O3-based photodetectors with square nanopore arrays10.1021/acsami.3c05265 ↗
34. Balanced performance for β-Ga2O3 solar blind photodetectors: the role of oxygen vacancies
35. High-sensitivity Solar-blind photodetector based on Ga2O3 films through manipulating oxygen vacancies10.1016/j.matlet.2023.134283 ↗
36. Impact of oxygen vacancies on photodetection performance of Ga2O3: a comprehensive review10.1007/s11664-025-11746-5 ↗
37. Oxygen vacancies modulating performance for Ga2O3 solar-blind photodetectors via low-cost mist chemical vapor deposition
38. Modulating oxygen vacancies in β-Ga2O3 microflake for high-responsivity solar-blind photodetectors10.1109/JSEN.2025.3572913 ↗
39. Simultaneously improved sensitivity and response speed of β-Ga2O3 solar-blind photodetector via localized tuning of oxygen deficiency10.1063/1.5088665 ↗
40. Tailoring surface properties and optoelectronic response of Ga2O3 films through advanced surface state engineering10.1016/j.apsusc.2025.165035 ↗
41. Epitaxial growth of β-Ga2O3 nanowires from horizontal to obliquely upward evolution10.1016/j.vacuum.2021.110444 ↗
42. <110>-growth orientation dependence of Ga2O3 nanowires on Cu3As seeds via vapor-solid-solid mechanism10.1016/j.jallcom.2021.158786 ↗
43. Analysis on the electronic trap of β-Ga2O3 single crystal10.1007/s10853-019-03777-1 ↗
44. Ultrafast self-powered solar-blind ultraviolet photodetector based on Ga2O3 microwire/GaN p-n heterojunction using a single-layer graphene as electrode10.1109/JSEN.2024.3402734 ↗
45. Responsivity surge in MAPbI3:PC61BM/Au/ZnO sandwich‐structured photodetector
46. High ultraviolet gain in Ga2O3/ZnO heterojunction photodetector based on MSM structure10.1016/j.jallcom.2024.176217 ↗
47. Wavelength modulation and fast response of mixed-phase β-Ga2O3:Zn/SnO2 in-plane heterojunction ultraviolet photodetectors10.1021/acsami.4c07802 ↗
48. The effect of vacancy defects on the electronic properties of β-Ga2O310.1016/j.commatsci.2022.111777 ↗
49. Photoinduced oxygen release and persistent photoconductivity in ZnO nanowires10.1186/1556-276X-6-404 ↗