open access

https://hdl.handle.net/2115/70626

Mechanisms of photo-induced degradation of polythiophene derivatives: re-examination of the role of singlet oxygen

英語

2017-06

Springer

Polymer bulletin

74(6)

2319-2330

Roles of singlet oxygen (1O2) in photo-induced degradation of poly(3-hexylthiophene) (P3HT) and poly(3-hexyloxythiophene) (P3HOT) were examined. The results indicate that 1O2 has a considerable role in the degradation of P3HT and P3HOT. Photo-irradiation of P3HT in air resulted in the reduction of the pi-conjugation. The photo-induced reduction also occurred for P3HOT, and it was much faster than that of P3HT. Manceau et al. have reported that 1O2 was generated by photo-irradiation of P3HT in the presence of oxygen and, nevertheless, 1O2 is not the principal photo-oxidative degradation intermediate of P3HT (Manceau et al., Macromol Rapid Commun 29:1823-1827, 2008). However, exposures of solid P3HT and P3HOT to chemically generated 1O2 provided decreases in the pi pi*absorption in our study. The decrease for P3HOT was much larger than that for P3HT. The exposure of P3HOT showed the formation of polarons. The difference in P3HT and P3HOT for the effects of the photo-irradiation and of 1O2 will be ascribed to the difference in their ionization potentials.

学術雑誌論文

Accepted Manuscript

The final publication is available at link.springer.com.

0170-0839