The electrical conductivity of alkylthio-substituted tetrathiafulvalene (TTCn-TTF) single crystal has been measured in a vacuum of 10−4 Pa with the two probe method. The room temperature dark conductivity of TTC10-TTF reaches 10−5 S cm−1, a value that is extraordinarily high compared with those of other organic semiconductors constructed with a single component. The cause of this high conductivity is that the central tetrathiafulvalene skeleton has been fastened strongly with the four long alkyl chains.
A series of CuTCNQ (TCNQ =
7,7,8,8-tetracyano-p-quinodimethane) thin-film
materials
were prepared by different methods or under different conditions and
characterized by
scanning electron microscopic analyses, infrared, Raman, and UV−vis
spectral analyses,
and current−voltage characteristic measurements. All of the
spectral analyses were
compared with those of chemically synthesized pure CuTCNQ powder
produced by the
metathetical reaction of CuI and TCNQ. The effects of the
preparation methods or growth
parameters upon the morphology of the film materials and their physical
properties were
discussed.
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