Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 22, Pages 18816-18825Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b03947
Keywords
hexafluoroquinoxaline; photovoltaic polymer; high efficiency; thermal annealing; nonfullerene
Funding
- National Natural Science Foundation of China [51673205, 51173206]
- 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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Through introducing six fluorine atoms Onto quinoxaline (Qx), a new electron acceptor unit-hexafluoroquinoxaline (HFQx) is first synthesized. On the basis of this unit, we synthesize a new donor-acceptor (D-A) copolymer (HFQx-T), which is composed of a benzodithiophene (BDT) derivative donor block and an HFQx accepting block. The strong electron-withdrawing properties of fluorine atoms increase significantly the open-circuit voltage (V-oc) by tuning the highest occupied molecular Orbital (HOMO) energy level. In addition, fluorine atoms enhance the absorption coefficient of the conjugated copolymer and change the film morphology, which implies an increase of the short-circuit current density (J(sc)) and fill factor (FF). Indeed, the HFQx-T:ITIC blended film achieves an impressive power conversion efficiency (PCE) of 9.4% with large short-current density (J(sc)) of 15.60 mA/cm(2), high V-oc of 0.92 V, and FF of 65% via two step annealing (thermal annealing (TA) and solvent vapor annealing (SVA) treatments). The excellent results obtained show that the new copolymer HFQx-T synthesized could be a promising candidate for organic photovoltaics.
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