AlGaAs diodes for X-ray spectroscopy.
journal contributionposted on 27.11.2008, 12:34 by J. E. Lees, D. J. Bassford, J. S. Ng, C. H. Tan, J. P. R. David
Al0.8Ga0.2As p+-p--n+ diodes with low reverse leakage currents (<10nA) were evaluated as room temperature (23ºC), soft X-ray photon counting detectors. X-ray spectra from a 55Fe radioactive source show these diodes can be used for spectroscopy with promising energy resolution of 1.47 keV FWHM at 5.9 keV. At elevated reverse bias levels (>20V) we observed avalanche multiplication which, while improving the signal-to-noise ratio, degraded the spectroscopic performance.