Optimized Morphology Enables High-Efficiency Nonfullerene Ternary Organic Solar Cells

• DOI: 10.1021/acs.langmuir.2c01952
• Publication Date: 2022-12-16T20:51:31Z
• Authors: Yun Wang; Zhengli Zhang; Haoming Xu; Haoyun Deng; Mi Hu; Ting Yang; Junli Li
• Keywords: Morphology

Tuning the three-dimensional morphology in active layer is an effective method to improve performance of bulk heterojunction organic solar cells (OSCs). In this work, acceptor–donor–acceptor structured small molecule ST10-CN-1 was synthesized and employed as guest donor fabricate ternary OSCs based on a PBDB-T:IT-M host binary system. The incorporation could broaden layer's absorption range light thereby leading promotional short-circuit current. Moreover, adding appropriate amount effectively regulate both lateral direction vertical stratification. All these morphological alterations helped speed up exciton dissociation, charge transit, collecting processes, which turn increased power conversion efficiency. As result, excellent PCE 11.5% for device PBDB-T:IT-M:ST10-CN-1 obtained. enhanced also linked formation alloylike state between PBDB-T ST10-CN-1, evidenced by fact that open circuit voltage lay those (0.925 V) ST10-CN-1:IT-M (1.064 V). This work illustrates refining incorporating third component way further enhance device's performance.