Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.2006...40g&link_type=abstract
Proc. SPIE Vol. 2006, p. 40-50, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV, Oswald H. Siegmund; Ed.
Astronomy and Astrophysics
Astronomy
Scientific paper
Theoretically, gallium arsenide detectors offer an attractive alternative to silicon for the high energy x-ray astronomer, due to the greater absorption power of the material. However, in practice, GaAs detectors made from bulk-grown crystals have a spectral resolution which falls well short of both expectation and that achieved by silicon detectors of comparable thickness. In contrast, a detector fabricated from GaAs grown by the liquid phase epitaxial (LPE) process displays full charge collection with a resolution in agreement with that expected from measurements of leakage current and device capacitance. Experimental results are presented showing the level of spectral resolution possible in a variety of GaAs detectors, including Liquid Enhancement Czochralski material from various manufacturers, Vertical Bridgeman and LPE material. Both the detector performance and the electrical characteristics (voltage- current, noise, etc) have been explored for each device.
Alexiev D.
Butcher K. S.
Grant S. M.
Sumner Timothy J.
Warren J. P.
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