A propeller-shaped perylene diimide hexamer as a nonfullerene acceptor for organic solar cells

作者：Liu, Juncheng; Xie, Sufei; Feng, Shiyu; Li, Miao; Wu, Liangliang; Xu, Xinjun^*; Chen, Xuebo; Li, Cuihong^*; Bo, Zhishan^*

来源：Journal of Materials Chemistry C, 2018, 6(35): 9336-9340.

DOI：10.1039/c8tc03081b

• SMALL-MOLECULE ACCEPTORS
• NON-FULLERENE ACCEPTORS
• ELECTRON-ACCEPTORS
• POLYMER
• EFFICIENCY
• BISIMIDE
• GENERATION
• MORPHOLOGY
• GEOMETRY
• ENABLES

A novel propeller-shaped molecule (HPB-PDI6) with a hexaphenylbenzene (HPB) core and six peripheral PDI units was synthesized via Co-2(CO)(8)-catalyzed cyclotrimerization and used as an acceptor for organic solar cells (OSCs). The intriguing geometry of the HPB core and the spatial repulsion of the PDI rings created a twisted three-dimensional propeller-shaped conformation for HPB-PDI6. The propeller-shaped conformation could prevent the acceptor molecules from forming large aggregates in the active layer. As expected, the PTB7-Th:HPB-PDI6 blend films show a favorable morphology as well as high and balanced charge carrier mobility. Devices based on PTB7-Th:HPB-PDI6 achieved a PCE of 6.63% with a V-oc of 0.92 V, a J(sc) of 15.11 mA cm(-2), and an FF of 48.0%. Our results have demonstrated that the easily prepared propeller-shaped HPB-PDI6 could be a promising acceptor for high efficiency organic solar cells.

• 出版日期2018-9-21
• 单位北京师范大学