We investigated transport properties of organic heterointerfaces formed by single-crystals of two organic donor-acceptor molecules, tetramethyltetraselenafulvalene (TMTSF) and 7,7,8,8-tetracyanoquinodimethane (TCNQ). Whereas the individual crystals have un-measurably high resistance, the interface exhibits a resistivity of few tens of MegaOhm 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 (TTF)-TCNQ interfaces, these results indicate that single-crystal organic heterostructures create new electronic systems with properties relevant to both fundamental and applied fields.
@article{arxiv.1004.3927,
title = {Small gap semiconducting organic charge-transfer interfaces},
author = {M. Nakano and H. Alves and A. S. Molinari and S. Ono and N. Minder and A. F. Morpurgo},
journal= {arXiv preprint arXiv:1004.3927},
year = {2015}
}