Direct C-H arylation synthesis of (DD ' AD ' DA ')-constituted alternating polymers with low bandgaps and their photovoltaic performance

作者：Shaker Mohamed; Trinh Cuc Kim; Kim Wonbin; Kim Heejoo; Lee Kwanghee; Lee Jae Suk^*

来源：New Journal of Chemistry, 2015, 39(6): 4957-4964.

DOI：10.1039/c5nj00287g

A series of new (DD'AD'DA')-constituted conjugated polymers were synthesized via C-H arylation with the aid of a Pd(OAc)(2)/Bu4NBr catalytic system. The polymers are based on 4,7-bis(4-hexylthiophen-2-yl)-2,1,3-benzothiadiazole (HT. BT. HT), which alternated with 3,4-ethylenedioxythiophene (EDOT) as a second donor and a lactam-and/or imide-containing material as a second acceptor. The synthesis methodology avoided the drawbacks of Stille and Suzuki coupling and obtained high yields. All of the new polymers possessed broader absorption windows with low energy bandgaps (1.34-1.64 eV), as well as low-lying HOMO energy levels. The prescreening of these polymers as an active material in bulk heterojunction solar cells was investigated and a power conversion efficiency of 2.36% was achieved.

• 出版日期2015