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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Ultraviolet Photodetectors: From Photocathodes to Low-Dimensional Solids.

Antoni Rogalski1, Zbigniew Bielecki2, Janusz Mikołajczyk2

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This paper reviews ultraviolet (UV) photodetector evolution, from early designs to advanced wide bandgap semiconductors like Gallium Oxide (Ga2O3) and low-dimensional materials, highlighting performance improvements.

Keywords:
2D nanostructuresphotoemissive UV photodetectorssilicon-based UV detectorsultraviolet photodetectorswide bandgap UV photodetectors

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Area of Science:

  • Optoelectronics
  • Semiconductor Physics
  • Materials Science

Background:

  • Ultraviolet (UV) photodetectors are crucial for various applications.
  • Their development spans decades, evolving from basic photoemission devices to sophisticated semiconductor-based sensors.
  • Understanding this evolution is key to appreciating current technological advancements.

Purpose of the Study:

  • To provide a comprehensive overview of the historical development of UV photodetectors.
  • To discuss the recent advancements in wide bandgap semiconductor and low-dimensional material-based UV detectors.
  • To highlight the key performance improvements achieved through architectural innovations.

Main Methods:

  • Literature review of UV photodetector technology.
  • Categorization of detectors based on historical progression and material type.
  • Analysis of device architectures and their impact on performance metrics.

Main Results:

  • Detailed description of photoemission detectors, photomultipliers, and image intensifiers.
  • In-depth discussion of silicon, AlGaN, SiC, diamond, and Ga2O3 based UV photodetectors.
  • Exploration of novel device concepts utilizing low-dimensional solid materials.

Conclusions:

  • Gallium Oxide (Ga2O3) shows promise for solar-blind UV detection due to its properties.
  • New device architectures significantly enhance UV photodetector sensitivity, frequency response, noise levels, and gain-bandwidth products.
  • The field continues to advance, driven by material innovation and novel device designs.