A new diketopyrrolopyrrole-based co-polymer for ambipolar field-effect transistors and solar cells

Tandy, Kristen and Dutta, Gitish K and Zhang, Yuliang and Venkatramaiah, N and Aljada, Muhsen and Burn, Paul L and Meredith, Paul and Namdas, Ebinazar B and Patil, Satish (2012) A new diketopyrrolopyrrole-based co-polymer for ambipolar field-effect transistors and solar cells. In: ORGANIC ELECTRONICS, 13 (10). pp. 1981-1988.

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Abstract

A new thieno3,2-b]thiophenediketopyrrolopyrrole-benzo1,2-b:4,5-b']dithio phene based narrow optical gap co-polymer (PTTDPP-BDT) has been synthesized and characterized for field-effect transistors and solar cells. In field-effect transistors the polymer exhibited ambipolar charge transport behaviour with maximum hole and electron mobilities of 10(-3) cm(2) V-1 s(-1) and 10(-5) cm(2)V(-1) s(-1), respectively. The respectable charge transporting properties of the polymer were consistent with X-ray diffraction measurements that showed close molecular packing in the solid state. The difference in hole and electron mobilities was explained by density functional theory calculations, which showed that the highest occupied molecular orbital was delocalized along the polymer backbone with the lowest unoccupied molecular orbital localized on the bis(thieno3,2-b]thiophene)diketopyrrolopyrrole units. Bulk heterojunction photovoltaic devices with the fullerene acceptor PC70BM were fabricated and delivered a maximum conversion efficiency of 3.3% under AM1.5G illumination. (C) 2012 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	ORGANIC ELECTRONICS
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Field-Effect Transistors; Solar Cells; Donor-Acceptor; Semiconducting Polymers; Diketopyrrolopyrrole; Ambipolar
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	20 Feb 2013 08:52
Last Modified:	20 Feb 2013 08:52
URI:	http://eprints.iisc.ac.in/id/eprint/45387

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