Abstract
Abstract The electrical resistivities and Seebeck coefficients of the 2 : 3 iodine complexes of phenoxazine, phenoselenazine, and benzophenothiazines were measured as a function of the temperature. They have resistivity values at 20°C ranging from 10 ohm·cm for the phenoxazine complex to 34 ohm·cm for the benzo[a]phenothiazine complex. Employing the equation of Johnson and Lark-Horowitz for the Seebeck coefficient of an intrinsic semiconductor, the ratio of the electron-to-hole mobility in the phenoselenazine complex was found to be 1.07 and the electron mobility was estimated as 0.26 cm2/V sec. By an examination of the vibrational spectra, the expected cation-radical character was confirmed for the complexes of phenoselenazine and benzophenothiazines. The presence of a broad electronic absorption band in the rock-salt region characteristic of low-resistivity organic semiconductors was noted in every case.
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