Abstract
WHEN one approaches the examination of dark conductivity of molecular crystals, a good first approximation is that ‘molecular crystals are electrical nonconductors’1. Most measurements of dark conductivity on molecular crystals such as anthracene must be regarded as involving carrier injection from electrode material, ambient gas, impurities or surface imperfections. Simple d.c. measurements by two-probe techniques which neglect polarization or space-charge effects are relatively meaningless. These measurements are, however, commonly performed to screen materials in an attempt to find high conductivity crystals.
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