Resonant Transport in Single Diketopyrrolopyrrole Junctions

Zang, Yaping and Ray, Suman and Fung, E-Dean and Borges, Anders and Garner, Marc H.- and Steigerwald, Michael L and Solomon, Gemma C and Patil, Satish and Venkataraman, Latha (2018) Resonant Transport in Single Diketopyrrolopyrrole Junctions. In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 140 (41). pp. 13167-13170.

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Abstract

We study the single-molecule transport properties of small bandgap diketopyrrolopyrrole oligomers (DPPn, n = 1-4) with lengths varying from 1 to 5 nm. At a low bias voltage, the conductance decays exponentially as a function of length indicative of nonresonant transport. However, at a high bias voltage, we observe a remarkably high conductance close to 10(-2) Go with currents reaching over 0.1 mu A across all four oligomers. These unique transport properties, together with density functional theory-based transport calculations, suggest a mechanism of resonant transport across the highly delocalized DPP backbones in the high bias regime. This study thus demonstrates the unique properties of diketopyrrolopyrrole derivatives in achieving highly efficient long-range charge transport in single molecule devices.

Item Type:	Journal Article
Publication:	JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Publisher:	AMER CHEMICAL SOC
Additional Information:	Copy right for this article belong to AMER CHEMICAL SOC
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	14 Nov 2018 15:12
Last Modified:	24 Nov 2018 15:23
URI:	http://eprints.iisc.ac.in/id/eprint/61048

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