The effect of varied alkyl chain length of additives on the PC71BMs was systematically investigated for the first time.
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The length of alkyl chain of additives influences on the surface morphology of PTB7:PC71BM bulk heterojunction film.
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The electrical properties of PTB7:PC71BM solar cells have been found to closely correlate with chain length of additives.
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A new four-step route is finally proposed to further optimize the performance of additive based polymer solar cell.
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