A near-infrared small molecule acceptor based on the quinoidal form for organic solar cells

作者：Sun, Shi-Xin^*; Xu, Jia-Wei; Chen, Xiao-Long; Zhang, You-Wen; Chen, Yang; Chen, De-Yin; Ren, Tian-Hua; Xing, Rong

来源：Functional Materials Letters, 2019, 12(2): 1950003.

DOI：10.1142/S1793604719500036

• Near-Infrared
• quinoidal form
• dithienopyrrole
• organic solar cells
• optical materials and properties

A novel non-fullerene small molecule acceptor named DPPMDPC6 with diketopyrrolopyrrole (DPP) as central moiety and methyldioxocyano-pyridine (MDP) units as two branches has been designed and synthesized. Benefitted from the quinoidal MDP segment, the molecule exhibits effective electron delocalization extending to the near infrared (NIR) region absorption with narrow bandgap of 1.42 eV. The acceptor also displayed intrinsic properties with good thermal stability, and matched energy levels with various donor materials especially for the commercial polymer PTB7. Under optimized condition, the devices fabricated by forming PTB7:DPPMDPC6 blend films yield a moderate PCE of 5.80% with a V-oc of 0.84 V, a J(sc) of 12.94 mA.cm(-2), and an FF of 53.4%. This preliminary study demonstrates that the new acceptor tailored with quinoidal MDP units could lead to enhancement on the low energy absorption band that is favorable for the photovoltaic performances.

• 出版日期2019-4
• 单位盐城师范学院; 北京大学深圳研究生院