Abstract
Abstract An expression is derived for the current-voltage characteristic under space-charge-limited conditions when the density of deep states increases exponentially with energy above the Fermi level. This shows that the slope of a logJ - log V curve increases slowly and only reaches the limiting value of (l + 1) (where l = T c/T and T c characterizes the steepness of the exponential) at voltages above those used in practical experiments. This invalidates the procedure of deriving values for T c by fitting straight lines to experimental log J - log V plots and suggests an explanation of some anomalous results published recently. Some brief comments are made on the values of T c to be expected for a-Si: H.
Published Version
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