Abstract
Low band gap polymers are expected to improve the efficiency of polymer solar cells. Polymers with donor-acceptor repeating units can lead to a reduction of band gap. Two novel poly(phenylenevinylene)s(PPV) copolymers PPV-QL and PPV-BPh containing alternating phenyl rings and quinoxaline units were synthesized and characterized by NMR, FT-IR. The UV-vis absorption spectra in solution/films were characterized. The geometries of the oligomers were optimized using semi-empirical AM1. Although an alternate donor-acceptor repeating units has been imparted, PPV-QL and PPV-BPh still reveal a similar optical band gap value compared to homopolymer PPV. And the absorption maximum of PPV-QL and PPV-BPh was evidently blue-shifted comparison with that of PPV. The similar optical band gap and evident blue shift compared to PPV are mainly due to the large steric hindrance induced by the quinoxaline units which lead to destroyed chain coplanar.
| Original language | English |
|---|---|
| Pages (from-to) | 44-47 |
| Number of pages | 4 |
| Journal | Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering |
| Volume | 26 |
| Issue number | 10 |
| State | Published - Oct 2010 |
Keywords
- Photovoltaic materials
- Poly(phenylenevinylene)s
- Polymer
