Binary Organic Solar Cells Breaking 19% via Manipulating the Vertical Component Distribution

The variation of the vertical component distribution can significantly influence the photovoltaic performance of organic solar cells (OSCs), mainly due to its impact on exciton dissociation and charge-carrier transport and recombination. Herein, binary devices are fabricated via sequential deposition (SD) of D18 and L8-BO materials in a two-step process. Upon independently regulating the spin-coating speeds of each layer deposition, the optimal SD device shows a record power conversion efficiency (PCE) of 19.05% for binary single-junction OSCs, much higher than that of the corresponding blend casting (BC) device (18.14%). Impressively, this strategy presents excellent universality in boosting the photovoltaic…

• NN
  National Natural Science Foundation of China

  Awards: 52120105006, 51925306, 52103352
• CA
  Chinese Academy of Sciences

  Award: XDPB08‐2
• YI
  Youth Innovation Promotion Association of the Chinese Academy of Sciences

  Award: 2022165
• UO
  University of Chinese Academy of Sciences
• FR
  Fundamental Research Funds for the Central Universities