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Keywords:

  • polymer tandem solar cells;
  • inter-connecting layers;
  • optical spacer
Thumbnail image of graphical abstract

A robust inter-connecting layer for achiev­­ing high-performance tandem polymer solar cells is fabricated and demonstrated in polymer tandem solar cells with a PCE of 7.0%. This layer is optically transparent, electrically conductive, and physically strong. It is revealed that, under light illumination, charges are collected and recombined in the interlayer; under dark conditions, charges are generated and extracted from it.