Synthesis and Characterization of Two-Dimensional Conjugated Polymers Incorporating Electron-Deficient Moieties for Application in Organic Photovoltaics

Polymers

Chuen-Yo Hsiow¹  Rathinam Raja¹  Leeyih Wang¹  Chi-An Dai²  Wen-Yen Chiu²  Yu-Hsiang Lin³  Syang-Peng Rwei³  Han-Ying Wang³ 

[1] Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan;Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan;Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 10608, Taiwan;

关键词: two-dimensional conjugated polymer;    polymer solar cell;    benzo[1,2-b:4,5-b′]dithiophene;    thieno[3,4-c]pyrrole-4,6-dione;    pyrrolo[3,4-c]pyrrole-1,4-dione;    conjugated side chain.;   

DOI  :  10.3390/polym8110382

来源: DOAJ

【 摘 要 】

A series of novel p-type conjugated copolymers, PTTVBDT, PTTVBDT-TPD, and PTTVBDT-DPP, cooperating benzo[1,2-b:4,5-b′]dithiophene (BDT) and terthiophene-vinylene (TTV) units with/without thieno[3,4-c]pyrrole-4,6-dione (TPD) or pyrrolo[3,4-c]pyrrole-1,4-dione (DPP) via Stille polymerization were synthesized and characterized. Copolymer PTTVBDT shows a low-lying HOMO energy level and ordered molecular-packing behavior. Furthermore, two terpolymers, PTTVBDT-TPD and PTTVBDT-DPP, display stronger absorption ability, alower-lying HOMO energy level, and preferred molecular orientation, due to the replacement TTV-monomer units with electron-deficient groups. Furthermore, bulk-heterojunction organic solar cells were fabricated using blends of the PTTVBDT-TPD, and PC61BM gave the best power conversion efficiency of 5.01% under the illumination of AM 1.5G, 100 mW·cm−2; the short circuit current (Jsc) was 11.65 mA·cm−2 which displayed a 43.8% improvement in comparison with the PTTVBDT/PC61BM device. These results demonstrate a valid strategy combining the two-dimensional molecular structure with random copolymerization strikes promising conjugated polymers to achieve highly efficient organic photovoltaics.

【 授权许可】

Unknown