Highly efficient organic solar cells enabled by suppressing triplet exciton formation and non-radiative recombination

The high non-radiative energy loss is a bottleneck issue that impedes the improvement of organic solar cells. The formation of triplet exciton is thought to be the main source of the large non-radiative energy loss. Decreasing the rate of back charge transfer is considered as an effective approach to alleviate the relaxation of the charge-transfer state and the triplet exciton generation. Herein, we develops an efficient ternary system based on D18:N3-BO:F-BTA3 by regulating the charge-transfer state disorder and the rate of back charge transfer of the blend. With the addition of F-BTA3, a well-defined morphology with a more condensed molecular packing is obtained. Moreover, a reduced charge-transfer state…

• NN
  National Natural Science Foundation of China

  Awards: 52120105006, XDPB08-2, 52003013, 2018FYA 0305800, 51925306, 52103352
• CA
  Chinese Academy of Sciences

  Awards: XDPB08, 2018FYA 0305800, XDPB08-2, 51925306
• UO
  University of Chinese Academy of Sciences

  Awards: 51925306, XDPB08-2, 2018FYA 0305800
• FR
  Fundamental Research Funds for the Central Universities

  Award: BSRF-1W1A