Optical absorption spectra due to intrinsic defects in CdS were measured between 0.13 and 2.5 eV, at 80 °K. The results indicate that Cd interstitials (Cd i ) and Cd vacancies (Vcd) are the dominant electronically active defects, which act as double donors and double acceptors, respectively. A detailed discussion of the properties of the observed absorption bands, in particular their shape, polarization, and the effects of Cd and S heat treatment, leads to assignments to optical transitions at isolated Cd i and Vcd and at nearest‐neighbour donor‐acceptor associates between these intrinsic defects and impurity ions.
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R. Boyn (1968) studied this question.
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