Ultrasensitive dynamic ultraviolet imaging based on a Ga<sub>2</sub>O<sub>3</sub> photodetector array
Defects and noise in Ga<sub>2</sub>O<sub>3</sub> detectors have traditionally limited their practical application. In this work, by reducing the triethylgallium flow from 200 sccm to 50 sccm, oxygen vacancy was effectively suppressed, leading to a transition in noise from Lorentzian to flicker-type, with a significant decrease in noise current from 0.15 nA to 1.01 pA. This improvement enhanced the detector's performance, yielding high sensitivity (3.72 A/W), fast response time (<i>τ</i><sub>d1</sub>/<i>τ</i><sub>d2</sub> = 1.6/13 ms), and solar-blind detection characteristics. Leveraging this low-noise detector, an 8 × 8 photodetector array and UV imaging system were developed, capable of target identification at distances up to 3 m, detecting UV radiation at intensities of 2.6 μW/cm<sup>2</sup>, and capturing real-time spatial movement of point light sources. These advancements mark a significant contribution to the development of high-speed, high-sensitivity, solar-blind UV imaging systems.
Authors
- Zhanqiang Ru (ORCID: https://orcid.org/0000-0002-3498-3063)
- Helun Song
- Shige Dai (ORCID: https://orcid.org/0009-0007-9454-1500)
- Yu Hu (ORCID: https://orcid.org/0000-0003-0100-3521)
- Tiwei Chen (ORCID: https://orcid.org/0000-0002-2297-2383)
- Gaofu Guo (ORCID: https://orcid.org/0009-0006-2045-8766)
- Jiawei Ye (ORCID: https://orcid.org/0000-0003-3498-8232)
- Peng Ding (ORCID: https://orcid.org/0000-0003-1959-7794)
- Zhongming Zeng (ORCID: https://orcid.org/0000-0001-7240-2058)
- Huanyu Zhang
- Xiaodong Zhang (ORCID: https://orcid.org/0000-0002-7528-9828)
- Li Zhang (ORCID: https://orcid.org/0000-0003-2039-2526)
- Yang An (ORCID: https://orcid.org/0000-0003-1527-033X)
- Chunhong Zeng (ORCID: https://orcid.org/0000-0003-4578-7364)
- Zibo Li (ORCID: https://orcid.org/0000-0001-8065-7923)
- Wenhua Shi
- Suzhen Cheng
- Dengrui Zhao (ORCID: https://orcid.org/0009-0002-1285-6896)
- Nan Liu
- Jingwu Gong (ORCID: https://orcid.org/0009-0008-7354-4662)
- Baoshun Zhang (ORCID: https://orcid.org/0000-0002-7289-2883)
Institutions
- Chinese Academy of Sciences (CN)
- Suzhou Institute of Nano-tech and Nano-bionics (CN)
- Institute of Nanotechnology (GB)
Publication Details
- Journal
- Optics Letters
- Published
- 2025-02-13
- DOI
- https://doi.org/10.1364/ol.555862
- Citations
- 8
- Primary Topic
- Ga2O3 and related materials
- Type
- article
- Field-Weighted Citation Impact
- 3.42
Funders
- National Key Research and Development Program of China