Abstract
Fabrication of field-effect transistors (FET) using the Langmuir–Blodgett films of neutral TCNQ derivatives with long alkyl-chain is reported. The films of neutral TCNQ derivatives (C n -TCNQ; n = 12, 15, 18) were employed as the active layers of FET. The FET characteristics of n-type semiconductor were clearly observed. It was found that the field-effect mobility depends on the alkyl-chain length. Infrared absorption spectroscopy implies that the lateral packing manner of molecules is affected by whether the number of carbon atoms in the alkyl-chain is odd or even. Such odd–even effect seems to be responsible for the different field-effect mobility values.
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