The temperature dependence of the electrical resistivity of single crystals of TCNQ anion radical salts with alkali metal, quinolinium, and triethylammonium cations has been investigated at temperatures between 300 and 540°K. It has been observed in these salts that the activation energy increases in the region of higher temperatures. In the cases of Na- and K(TCNQ) crystals, the reversal of the sign of the thermo-e.m.f. from the p-type to the n-type has been observed around the temperatures at which the activation energy increases. An interpretation of the experimental results is presented.
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Sakai et al. (1972) studied this question.
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