1972 Volume 45 Issue 7 Pages 2096-2100
The electrical resistivities and Seebeck coefficients of 2: 3 iodine complexes of N-methyl- and N-ethyl-phenothiazines were measured. The former complex exhibits a resistivity of 2.0 ohm cm and an activation energy for semiconduction of 0.20 eV at 20°C. Applying the equation of Johnson and Lark-Horowitz for the Seebeck coefficient of an intrinsic semiconductor, the ratio of the electron mobility to the hole mobility in the N-methyl-phenothiazine complex was found to be 2.08 and the electron mobility was estimated as 0.23 cm2/Vsec. The resistivity of the N-ethylphenothiazine complex is 74 ohm cm, and the activation energy 0.15 eV at 20°C. In this complex, the hole appears to be more mobile by a factor of five than the electron. Lichtenecker’s logarithmic rule is observed neither by the resistivity nor by the activation energy of the mixtures of these two complexes.
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