Achieving 20% Efficiency in Organic Solar Cells Through Conformationally Locked Solid Additives

Abstract Volatile solid additives (VSAs) have emerged as one of the most effective strategies for optimizing the active layer morphology of organic solar cells (OSCs). In this study, two VSAs, HBT‐1 and HBT‐2, are designed and synthesized to investigate the effect of the VASs’ conformation on the photovoltaic performances. Compared to HBT‐1, HBT‐2 incorporates internal noncovalent conformational locks (NoCLs), resulting in reduced conformational disorder, improved molecular planarity, and enhanced crystallinity. These features significantly influence the intermolecular packing of both donor and acceptor materials in the active layer, which can facilitate charge transport and reduce charge recombination.…

• NN
  National Natural Science Foundation of China

  Awards: 52120105006, 52473200, 51925306, 52103352
• NK
  National Key Research and Development Program of China

  Award: 2018FYA0305800