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

Tandy, Kristen ; Dutta, Gitish K. ; Zhang, Yuliang ; Venkatramaiah, N. ; Aljada, Muhsen ; Burn, Paul L. ; Meredith, Paul ; Namdas, Ebinazar B. ; Patil, Satish (2012) A new diketopyrrolopyrrole-based co-polymer for ambipolar field-effect transistors and solar cells Organic Electronics, 13 (10). pp. 1981-1988. ISSN 1566-1199

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Official URL: http://doi.org/10.1016/j.orgel.2012.05.046

Related URL: http://dx.doi.org/10.1016/j.orgel.2012.05.046

Abstract

A new thieno[3,2-b]thiophenediketopyrrolopyrrole-benzo[1,2-b:4,5-b′]dithiophene 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 cm2 V−1 s−1 and 10−5 cm2 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(thieno[3,2-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.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:120555
Deposited On:01 Jul 2021 12:31
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