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Optical Absorption in Neutron Irradiated GaAs
Author(s) -
Baramidze N. V.,
Bonchbruevich V. L.,
Kurdiani N. I.
Publication year - 1984
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221240126
Subject(s) - irradiation , absorption (acoustics) , attenuation coefficient , cluster (spacecraft) , neutron , field (mathematics) , field dependence , materials science , photon , amorphous solid , molecular physics , atomic physics , physics , optics , chemistry , nuclear physics , magnetic field , crystallography , mathematics , quantum mechanics , computer science , pure mathematics , programming language
The spectral dependence is investigated of the light absorption coefficient, α, of GaAs subjected to a fast‐neutron irradiation. In the tail region a complex dependence is found: three parts are seen each of which is described by an exponential dependence of α on photon energy. The experimental results are explained using the concept of random fieldsgenerated by irradiation produced clusters. The statistical characteristicsof the fields are calculated and a quantitative agreement with the experimental data is obtained. Various parts of the spectrum are ascribed to absorption tails due to three kinds of random fields: 1. a deformation potential field due to cluster produced stresses, 2. a smooth field produced by a setof charged clusters in the GaAs matrix, and 3. an intrinsic random field inthe amorphous substance of the clusters.