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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Related Experiment Video

Updated: Jan 14, 2026

Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Ultrasensitive and Ultrafast Self-Powered Ultraviolet Photodetector Array for Solar-Blind and Weak-Light Imaging.

Weilong Deng1, Xiangyu Fan2, Yuxuan Du2

  • 1National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, 150001, China.

Advanced Materials (Deerfield Beach, Fla.)
|October 17, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel ultraviolet (UV) photodetector array using CuNiO2/SiC heterojunctions for ultrasensitive weak-light detection. The device achieves superior performance, enabling real-time imaging under solar illumination.

Keywords:
CuNiO2/SiC heterojunctionsarraysself‐poweredsolar‐blindweak‐light

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Optoelectronics

Background:

  • Self-powered ultraviolet (UV) photodetectors (PDs) using wide bandgap semiconductors (WBGSs) and heterostructures struggle with ultrasensitive and ultrafast weak-light detection.
  • Existing SiC and Ga2O3-based WBGS UV PDs have limitations in sensitivity and response speed.

Purpose of the Study:

  • To demonstrate an 8x8 UV photodetector array based on CuNiO2/SiC p-n heterojunctions.
  • To achieve high performance in both solar-blind and weak-light detection conditions.
  • To explore the potential for real-time imaging applications.

Main Methods:

  • Fabrication of an 8x8 UV photodetector array utilizing CuNiO2/SiC p-n heterojunctions.
  • Characterization of device performance including weak-light detection limit, response time, responsivity, and detectivity.
  • Analysis of charge transport mechanisms, interface quality, and light absorption enhancement.

Main Results:

  • The CuNiO2/SiC UV photodetector array achieved a weak-light detection limit of 4.6 nW·mm-2.
  • Demonstrated a fast response time of 45 ns, high responsivity of 104.2 mA·W-1, and detectivity of 3.4 × 1012 Jones.
  • Exhibited low noise power density (<10-22 A2·Hz-1) and a high cutoff frequency (5 kHz), outperforming existing WBGS UV PDs.

Conclusions:

  • The CuNiO2/SiC heterojunction is highly effective for self-powered UV photodetectors.
  • The device's performance is attributed to high interface quality, a large built-in electric field, Fowler-Nordheim tunneling transport, and enhanced light absorption.
  • The developed UV PD array enables high-contrast real-time reflection imaging under solar illumination.