Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 22, Pages 11286-11293Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta02486j
Keywords
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Funding
- National Natural Science Foundation of China [51673205]
- Science Fund for Distinguished Young Scholars of Hunan Province [2017JJ1029]
- Project of Innovation-driven Plan in Central South University, China [2016CX035]
- State Key Laboratory of Powder Metallurgy, Central South University, China
- Fundamental Research Funds for the Central Universities of Central South University [2016zzts023]
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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.
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