Abstract
Abstract The electrical conductivity and the temperature dependency of the organic semiconductors, five simple polycyclic aromatic compounds, two charge transfer complexes and a free radical, have been observed up to 1.6×105 kg./cm2. The conductivity thus increases to 105–107 times that at atmospheric pressure, while the band gaps decrease to about one fifth of the ordinary values. These abrupt changes may be caused by the overlapping of π-electron clouds of adjacent aromatic molecules.
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