Activationless charge transport across 4.5 to 22 nm in molecular electronic junctions

Yan H.; Bergren A.J.; McCreery R.Della Rocca M.L.Martin P.Lafarge P.Lacroix J.C.

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Activationless charge transport across 4.5 to 22 nm in molecular electronic junctions

机译：Activationless charge transport across 4.5 to 22 nm in molecular electronic junctions

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In this work, we bridge the gap between short-range tunneling in molecular junctions and activated hopping in bulk organic films, and greatly extend the distance range of charge transport in molecular electronic devices. Three distinct transport mechanisms were observed for 4.5-22-nm-thick oligo(thiophene) layers between carbon contacts, with tunneling operative when d 16nmfor high temperatures and lowbias, and a third mechanism consistent with field-induced ionization of highest occupiedmolecular orbitals or interface states to generate charge carriers when d = 8-22 nm. Transport in the 8-22-nm range is weakly temperature dependent, with a field-dependent activation barrier that becomes negligible at moderate bias. We thus report here a unique, activationless transport mechanism, operative over 8-22-nm distanceswithout involving hopping,which severely limits carriermobility and device lifetime in organic semiconductors. Charge transport in molecular electronic junctions can thus be effective for transport distances significantly greater than the 1-5 nm associated with quantum-mechanical tunneling.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2013年第14期|5326-5330|共5页
作者
Yan H.; Bergren A.J.; McCreery R.Della Rocca M.L.Martin P.Lafarge P.Lacroix J.C.;
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作者单位

National Institute for Nanotechnology, Edmonton, AB T6G 2M9, Canada;

Laboratoire Matériaux et Phénomènes Quantiques (MPQ), Unité Mixte de Recherche 7162, Université Paris Diderot, Sorbonne Paris Cité, 75205 Paris Cedex 13, France;

Laboratoire Interfaces, Traitements, Organisation et Dynamique des Systèmes (ITODYS), Unité Mixte de Recherche 7086, Université Paris Diderot, Sorbonne Paris Cité, 75205 Paris Cedex 13, France;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
All-carbon molecular junction; Attenuation coefficient; Field ionization; Strong electronic coupling;

Activationless charge transport across 4.5 to 22 nm in molecular electronic junctions

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