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GaN-Based Solar-Ultraviolet Detection Instrument.

E Monroy, F Calle, C Angulo

    Applied Optics
    |February 21, 2008
    PubMed
    Summary
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    We developed a solar-ultraviolet (UV) monitoring system using gallium nitride (GaN)-based photodetectors. Schottky photodiodes demonstrated optimal performance, enabling a reliable UV detection head.

    Area of Science:

    • Materials Science
    • Semiconductor Physics
    • Optoelectronics

    Background:

    • Gallium nitride (GaN)-based materials are crucial for optoelectronic devices due to their wide bandgap properties.
    • Accurate solar-UV monitoring is essential for applications ranging from environmental science to human health.
    • Developing robust and sensitive UV detectors is an ongoing challenge in semiconductor research.

    Purpose of the Study:

    • To fabricate and characterize a solar-UV monitoring system utilizing GaN-based photodetectors.
    • To evaluate different GaN photodetector structures (photoconductors, p-n junction, Schottky barrier) for UV sensing capabilities.
    • To assess the performance of Al(x)Ga(1-x)N detectors and integrate GaN Schottky diodes into a complete UV detection head.

    Main Methods:

    Related Experiment Videos

  • Fabrication of GaN photoconductors, p-n junction photodiodes, and Schottky barrier photodiodes.
  • Characterization of fabricated devices for UV sensing performance, including responsivity, linearity, and noise.
  • Preliminary investigation of Al(x)Ga(1-x)N detectors with varying aluminum compositions.
  • Assembly and evaluation of a complete solar-UV detection head using optimized GaN Schottky diodes.

    • Main Results:

    • Schottky barrier photodiodes exhibited the best performance among the tested GaN structures.
    • Optimized Schottky photodiodes demonstrated a linear response, flat responsivity (100 mA/W), and high visible rejection ratio (>10^3).
    • A noise-equivalent power of 1 nW/Hz(-1/2) was achieved for the Schottky photodiodes.
    • Preliminary data on Al(x)Ga(1-x)N detectors showed potential for tailored UV detection.

    Conclusions:

    • GaN-based Schottky photodiodes are highly suitable for solar-UV monitoring applications.
    • The developed GaN Schottky diode-based detection head offers a promising solution for accurate UV sensing.
    • Further research into Al(x)Ga(1-x)N alloys could lead to advanced UV detector designs.