Small gap semiconducting organic charge-transfer interfaces


We investigated transport properties of organic heterointerfaces formed by single-crystals of two organic donor-acceptor molecules, tetramethyltetraselenafulvalene and 7,7,8,8-tetracyanoquinodimethane (TCNQ). Whereas the individual crystals have unmeasurably high resistance, the interface exhibits a resistivity of few tens of megohm with a temperature dependence characteristic of a small gap semiconductor. We analyze the transport properties based on a simple band diagram that naturally accounts for our observations in terms of charge transfer between two crystals. Together with the recently discovered tetrathiafulvalene-TCNQ interfaces, these results indicate that single-crystal organic heterostructures create functional electronic systems with properties relevant to both fundamental and applied fields. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3449558]



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Nakano, M; Alves, H; Molinari, AS; Ono, S; Minder, N; Morpurgo, AF

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We acknowledge H. Xie and I.G. Lezama for experimental help and fruitful discussions. H.A., S.O., and A.F.M. also acknowledge financial support from FCT, Grant-in-Aid for Scientific Research (Grant No. 20740213) from MEXT, NEDO and MaNEP, respectively.

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