Efficient Organic Solar Cell with 16.88% Efficiency Enabled by Refined Acceptor Crystallization and Morphology with Improved Charge Transfer and Transport Properties

Abstract Single‐layered organic solar cells (OSCs) using nonfullerene acceptors have reached 16% efficiency. Such a breakthrough has inspired new sparks for the development of the next generation of OSC materials. In addition to the optimization of electronic structure, it is important to investigate the essential solid‐state structure that guides the high efficiency of bulk heterojunction blends, which provides insight in understanding how to pair an efficient donor–acceptor mixture and refine film morphology. In this study, a thorough analysis is executed to reveal morphology details, and the results demonstrate that Y6 can form a unique 2D packing with a polymer‐like conjugated backbone oriented normal to…

• UD
  U.S. Department of Energy
• NS
  Natural Science Foundation of Shanghai

  Award: 19ZR1401400
• NN
  National Natural Science Foundation of China

  Awards: 21734009, 21822505, 51973110, 21905102
• CP
  China Postdoctoral Science Foundation

  Award: 2019M662892
• OO
  Office of Science
• BE
  Basic Energy Sciences