| 초록 |
We designed and synthesized new polymer material as a donor polymer, Poly{4,8-bis(5-(2-ethylhexyl)-3-fluoro-4-hexylthiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene-co-1,3-bis(2-ethylhexyl)-5,7-di(thiophen-2-yl)-4H,8H-benzo[1,2-c:4,5-c']dithiophene-4,8-dione}, for solar cell materials. By changing the position of the F atom on the BDT moiety, not only high HOMO level was observed but also the interaction between C-F…H and F…S through non-covalent bonding was enhanced. In addition, another alkyl chain was incorporated to solve the solubility problem introduced by F atom. Also, by introducing the Dithieno[2,3-d:2’,3’-d”]benzo[1,2-b:4,5-b’]dithiophene (DTBDT), which has a more resonant structure than BDT, The polymer is intended to have better π-π stacking, higher charge-carrier mobility and broader absorption region. |
