Vb. Chmill et al., EXPLORATION OF GAAS STRUCTURES WITH PI-NU JUNCTION FOR COORDINATE SENSITIVE DETECTORS, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 340(2), 1994, pp. 328-340
The results of a systematic study of GaAs samples as the basis for the
construction of radiation resistant coordinate sensitive detectors ar
e presented. The technology to manufacture high resistivity GaAs layer
s has been optimized. As a result we have produced samples with charge
collection efficiency greater than 95% and with a time response of le
ss than a few ns for minimum ionizing particle detection. The study of
the radiation resistance of the GaAs samples has shown that their mai
n characteristics degrade by less than by 20% at a neutron fluence of
the order of 10(15) cm(-2) and do not worsen at a absorbed gamma-dose
of 11 Mrad.