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Development of AlGaAs avalanche diodes for soft X-ray photon counting
- Source :
- 2011 IEEE Nuclear Science Symposium Conference Record.
- Publication Year :
- 2011
- Publisher :
- IEEE, 2011.
-
Abstract
- We report on the performance of avalanche photodiodes (APDs) based on the wide band gap material AlGaAs which have been developed for soft X-ray spectroscopy applications. A number of diode types with different layer thicknesses have been characterised. The temperature dependence of the avalanche multiplication process at soft X-ray energies in Al 0.8 Ga 0.2 As APDs was investigated at temperatures from +80 °C to −20 °C. X-ray spectra from a 55Fe radioactive source show these diodes can be used for spectroscopy with promising energy resolution (0.9–2.5keV) over a wide temperature range. The temperature dependence of the pure electron initiated multiplication factor (M e ) and the mixed carrier initiated avalanche multiplication factor (M mix ) were experimentally measured. The experimental results are compared with a spectroscopic Monte Carlo model for Al 0.8 Ga 0.2 As diodes from which the temperature dependence of the pure hole initiated multiplication factor (M h ) is determined.
Details
- Database :
- OpenAIRE
- Journal :
- 2011 IEEE Nuclear Science Symposium Conference Record
- Accession number :
- edsair.doi...........efe3253a3ca9a8d33261f4f969ff9301