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Biological Samples Preparation for Speciation at Cryogenic Temperature using High-Resolution X-Ray Absorption Spectroscopy
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High temperature AlInP X-ray spectrometers.

S Zhao1, S Butera2, G Lioliou2

  • 1Space Research Group, Department of Engineering and Design, School of Engineering and Informatics, University of Sussex, Falmer, Brighton, BN1 9QT, UK. Shifan.Zhao@sussex.ac.uk.

Scientific Reports
|August 23, 2019
PubMed
Summary
This summary is machine-generated.

Custom AlInP photodiodes function as high-temperature X-ray detectors. These photon-counting devices demonstrate robust performance up to 100°C, crucial for space science and extreme environments.

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Area of Science:

  • Semiconductor Physics
  • Materials Science
  • Detector Technology

Background:

  • High-temperature operation of semiconductor devices is critical for extreme environment applications.
  • Developing robust photon-counting X-ray detectors is essential for space science and terrestrial exploration.
  • Aluminum Indium Phosphide (AlInP) offers potential for high-temperature optoelectronic applications.

Purpose of the Study:

  • To characterize custom AlInP p+-i-n+ mesa photodiodes for high-temperature X-ray detection.
  • To evaluate the performance of these photodiodes as photon-counting X-ray detectors up to 100°C.
  • To analyze system noise and material properties at elevated temperatures.

Main Methods:

  • Electrical characterization of AlInP photodiodes (217 µm and 409 µm diameters) from 0°C to 100°C.
  • Investigation of photodiode performance using an 55Fe radioisotope X-ray source and a low-noise preamplifier.
  • Measurement of energy resolution and estimation of the dielectric dissipation factor of AlInP.

Main Results:

  • Achieved energy resolutions of 1.31 keV ± 0.04 keV (217 µm) and 1.64 keV ± 0.08 keV (409 µm) at 100°C for 5.9 keV X-rays.
  • Demonstrated stable photon-counting X-ray detection capabilities at temperatures up to 100°C.
  • Presented detailed noise analysis and dielectric dissipation factor as a function of temperature.

Conclusions:

  • Custom AlInP photodiodes exhibit excellent high-temperature performance as photon-counting X-ray detectors.
  • These detectors are suitable for space science instrumentation in hot environments and extreme terrestrial applications.
  • The study reports the thickest AlInP X-ray detectors characterized at high temperatures to date.