InAs avalanche photodiodes for X-ray detection

Pulse height spectra were obtained by irradiating 55Fe radioactive X-ray source on an InAs n-i-p APD cooled to 77K. The full width half maximum (FWHM) of the detected photopeak at 5.9 keV improves with increasing reverse bias. The FWHM decreases rapidly with gain from 2 keV at M = 1 to ~950eV at M =...

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Bibliographic Details
Main Authors: Gomes, R. B., Pin Jern Ker, Chee Hing Tan, David, J. P. R., Jo Shien Ng
Format: Conference Proceeding
Language:English
Online Access:Request full text
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Summary:Pulse height spectra were obtained by irradiating 55Fe radioactive X-ray source on an InAs n-i-p APD cooled to 77K. The full width half maximum (FWHM) of the detected photopeak at 5.9 keV improves with increasing reverse bias. The FWHM decreases rapidly with gain from 2 keV at M = 1 to ~950eV at M = 5.2, improving the minimum detectable energy and resolution of the APD. The larger than expected FWHM is due to non-optimised packaging that leads to increased leakage current of the detector.
ISSN:1082-3654
2577-0829
DOI:10.1109/NSSMIC.2011.6154421