Electrical Conductivity of Organic Semiconductors at High Pressure

Abstract

Abstract In order to study the effect of high pressure on the electrical conductivity of organic semiconductors, the band structure of the anthracene crystal has been calculated at atmospheric pressure and also at 160 kilobars, using the treatment of the tight-binding approximation. The total band widths of both electrons and holes at 160 kilobars are 5∼6 times as large as those at atmospheric pressure. Although the mobilities of both carriers, on the whole, increase in magnitude by several tens times at 160 kilobars, the sharp drop in the resistivity at high pressure may be due mostly to the great increase in the concentrations of the charge carriers (103∼104 times).