Organic Solar Cell with Efficiency of 20.49% Enabled by Solid Additive and Non‐Halogenated Solvent

Recently, benzene-based solid additives (BSAs) have emerged as pivotal components in modulating the morphology of the blend film in organic solar cells (OSCs). However, since almost all substituents on BSAs are weak electron-withdrawing groups and contain halogen atoms, the study of BSAs with non-halogenated strong electron-withdrawing groups has received little attention. Herein, an additive strategy is proposed, involving the incorporation of non-halogenated strong electron-withdrawing groups on the benzene ring. An effective BSA, 4-nitro-benzonitrile (NBN), is selected to boost the efficiency of devices. The results demonstrate that the NBN-treated device exhibits enhanced light absorption, superior charge…

• NN
  National Natural Science Foundation of China

  Awards: 52373180, 52122307
• NK
  National Key Research and Development Program of China

  Award: No.2024YFF1500300
• FR
  Fundamental Research Funds for the Central Universities

  Award: 2024ZYGXZR076