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Modelling results of avalanche multiplication in AlGaAs soft X-ray APDs

journal contribution
posted on 2023-06-08, 16:18 authored by Anna BarnettAnna Barnett, J E Lees, D J Bassford, J S Ng, C H Tan, R B Gomez
First results from a new simple simulation of X-ray spectroscopy with an Al0.8Ga0.2As p+–p-–n+ spectroscopic X-ray photon counting avalanche photodiode are presented and compared with experimentally obtained data. Particular attention is paid to the experimentally observed phenomenon of an additional peak being present in the spectrum from a radioisotope source that, whilst previously reported, had not been fully explained. The additional peak is shown to result from the unequal distributions of multiplications undergone by the charge carriers created by photons absorbed in the p+ and p- layers. The consequences of this effect for future AlGaAs X-ray photon counting avalanche photodiode designs are discussed.

History

Publication status

  • Published

Journal

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

ISSN

0168-9002

Publisher

Elsevier

Volume

626-7

Page range

25-30

Department affiliated with

  • Engineering and Design Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2013-11-29

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