Synthesis of Solid Additive 2-(thiophene-2-methylene)malononitrile and its Organic Photovoltaic Performance
A simple and low-cost solid additive 2-(thiophene-2-methylene)malononitrile(SAT)was synthe-sized to improve the performance of organic photovoltaic devices,and its effects on the performance of organic solar cells were tested.The results showed that UV-vis absorption spectrum of the optimized blend film was red-shifted by 14 nm,and the fluorescence intensity was reduced significantly.The crystallinity,phase sepa-ration morphology and molecular stacking were improved for better exciton separation and charge transfer.When the mass concentration of SAT was 5 mg/mL,the open-circuit voltage decreased from 0.85 V to 0.83 V,and the short-circuit current increased from 21.15 mA/cm2 to 23.58 mA/cm2,the fill factor increased from 65.70％to71.17％and the power conversion efficiency increased from 11.89％to 13.90％.
Organic solar cellssolid additives2-(thiophene-2-methylene)malononitrilephotovoltaic per-formance
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