Abstract
The dependence of the dark current in metal-PVK-SnO 2 systems on applied voltage and temperature has been investigated. The current-voltage-temperature characteristics in the temperature range 298–398 K provide support for a Richardson-Schottky (RS) field-assisted hole injection mechanism in the case of high work function metal electrodes (Pt, Au, Ag) at positive bias. A diffusion-limited process is operative over the temperature range studied. Departures from this mechanism, observed at the highest temperature studied, are attributed to the increasing contribution of carriers from other mechanisms to the measured conductivity.
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