Novel dithienopyrrole-based molecular donor materials for organic solar cells

作者：Zhang, Zong-Bing; Xu, Jia-Wei; Zhang, Xin-Yu; Sun, Shi-Xin^*; Xing, Rong^*

来源：Functional Materials Letters, 2017, 10(6): 1750085.

DOI：10.1142/S1793604717500850

• Solar energy materials
• diketopyrrolopyrrole
• dithienopyrrole
• organic solar cells
• optical materials and properties

A new molecule with dithieno[3,2-b: 2', 3'-d] pyrrole (DTP) as central moiety and two terminal diketopyrrolopyrrole (DPP) units named DPP-DTPC8 has been designed and synthesized. The push-pull molecule exhibits excellent thermal stability, strong absorption in visible region, and matched energy levels. Devices fabricated from DTPC8: PC71BM blend films exhibit the maximum power conversion efficiency of 2.75%, with Voc of 0.63 V, Jsc of 9.94 mA . cm(-2), and FF of 43.8%. The active layers undergo thermal annealing or solvent vapor annealing treatments, exhibiting inconspicuous influence on the aggregation of the molecule. This study demonstrates that the new molecule DPP-DTPC8 tailored with DTP and DPP units could affect the thermal stability, absorption, energy levels and morphology that manage the photovoltaic performances.

• 出版日期2017-12
• 单位南京工业大学; 盐城师范学院