Issue 22, 2017

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

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

Supplementary files

Article information

Article type
Paper
Submitted
21 Mar 2017
Accepted
08 May 2017
First published
09 May 2017

J. Mater. Chem. A, 2017,5, 11286-11293

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, 5, 11286 DOI: 10.1039/C7TA02486J

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