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Keywords:

  • polymer–polymer solar cell;
  • organic photovoltaic cells;
  • morphology
Thumbnail image of graphical abstract

Careful selection of processing solvents to tune optimal active layer morphology in a donor-acceptor copolymer blend [PTB7:P(NDI2OD-T2)] yields bulk heterojunction microstructures with intradomain percolative pathways and enhanced charge transport. Such microstructures afford all-polymer solar cells with power conversion efficiencies as high as 2.7%.