High-efficiency polymer solar cells with small photon energy loss

  title={High-efficiency polymer solar cells with small photon energy loss},
  author={Kazuaki Kawashima and Yasunari Tamai and Hideo Ohkita and Itaru Osaka and Kazuo Takimiya},
  booktitle={Nature communications},
A crucial issue facing polymer-based solar cells is how to manage the energetics of the polymer/fullerene blends to maximize short-circuit current density and open-circuit voltage at the same time and thus the power conversion efficiency. Here we demonstrate that the use of a naphthobisoxadiazole-based polymer with a narrow bandgap of 1.52 eV leads to high open-circuit voltages of approximately 1 V and high-power conversion efficiencies of ∼9% in solar cells, resulting in photon energy loss as… CONTINUE READING
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