Small gap semiconducting organic charge-transfer interfaces

Nakano, M.; Alves, H.; Molinari, A. S.; Ono, S.; Minder, N.; Morpurgo, A. F.
June 2010
Applied Physics Letters;6/7/2010, Vol. 96 Issue 23, p232102
Academic Journal
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.


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