A non-fullerene acceptor with all “A” units realizing high open-circuit voltage solution-processed organic photovoltaics?

Journal of Materials Chemistry A Pub Date: 2013-12-03 DOI: 10.1039/C3TA14396A

Abstract

A novel non-fullerene small molecule electron acceptor TTzBT-DCAO, which contains all electron-withdrawing units of 2,1,3-benzothiadiazole, oligothiazole and alkyl cyanoacetate, has been synthesized and characterized. Its photophysical, electrochemical, and photovoltaic properties have been investigated. The material has favorable HOMO and LUMO levels of ?5.88 and ?3.60 eV, and shows strong absorption in the visible spectrum up to 650 nm. The small molecule?:?non-fullerene bulk-heterojunction organic photovoltaics (OPVs) were constructed based on two small molecules SF8TBT and TTzBT-DCAO. The influence of the donor?:?acceptor composition on device performance was investigated. The open-circuit voltages of the devices are over 1.20 V, which is among the highest values reported for single-junction OPVs. The results indicate that small molecules with all electron-withdrawing units could provide a novel route to efficient solution-processed OPVs with high open-circuit voltages.

Graphical abstract: A non-fullerene acceptor with all “A” units realizing high open-circuit voltage solution-processed organic photovoltaics
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