Further Considerations on a Theory of Superlinearity in CdS and Related Materials

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Abstract
A theory of superlinearity by Cardon and Bube is extended by considering the effect of a high density of shallow traps, either discrete or with a quasiexponential distribution. New conditions for the breakpoints of superlinearity are introduced. These new conditions allow the explanation of several features of superlinearity in sintered layers, including the ``anomalous'' observation of lifetime decrease above the superlinear region, as described in investigations on CdSe by Stupp. A possible relationship between such trap distributions and an apparent decrease in sensitizing center hole ionization energy in highly impure single crystals of CdS is suggested. A summary of all the basic superlinearity conditions is given, with principal emphasis on the physics of the involved mechanisms.