Conduction mechanisms in zinc sulphide switching devices - II

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Abstract
The results of an extensive investigation of the low-field DC current-voltage characteristics of vapour-grown zinc sulphide platelet (1-100 μm thickness) switching devices is described in an attempt to characterize and understand the end states of the switching. A wide range of metastable states was observed, typical characteristics exhibiting a range of current-voltage laws, including the Poole-Frenkel effect. A detailed analysis of the results in terms of conduction band theory, whilst not categorically ruling out impurity conduction, does strongly support an explanation of the conduction in terms of filamentary behaviour and a `variable donor density' model. A fuller account of switching in zinc sulphide is given in the accompanying paper (I).