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Achieving over 10% efficiency in a new acceptor ITTC and its blends with hexafluoroquinoxaline based polymers

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Abstract

A new small molecule, ITTC, bearing an indacenodithieno[3,2-b]thiophene core and a 2-(6-oxo-5,6-dihydro-4H-cyclopenta[c]thiophen-4-ylidene)malononitrile end group, was designed, synthesized and characterized as a non-fullerene electron acceptor. The ITTC possesses strong and broad light absorption, high and balanced charge mobility and a nanoscale interpenetrating morphology when blended with a recently synthesized hexafluoroquinoxaline based polymer donor-HFQx-T. HFQx-T was obtained from a Stille coupling copolymerization of a 2,6-bis(trimethyltin)-4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)benzo[1,2-b:4,5-b′]dithiophene electron donating unit and a hexafluoroquinoxaline based electron accepting unit. The device employing HFQx-T as the donor and ITTC as the acceptor delivered a power conversion efficiency (PCE) of 8.19% without any post-treatment. After thermal annealing, an impressive PCE of 10.4% was obtained. This performance is among the highest PCEs reported for fullerene-free polymer solar cells up to date. This study demonstrates the great potential of ITTC as n-type materials for organic electronics.

Graphical abstract: Achieving over 10% efficiency in a new acceptor ITTC and its blends with hexafluoroquinoxaline based polymers

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Publication details

The article was received on 21 Mar 2017, accepted on 08 May 2017 and first published on 09 May 2017


Article type: Paper
DOI: 10.1039/C7TA02486J
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Achieving over 10% efficiency in a new acceptor ITTC and its blends with hexafluoroquinoxaline based polymers

    Z. Zhang, L. Feng, S. Xu, J. Yuan, Z. Zhang, H. Peng, Y. Li and Y. Zou, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA02486J

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