Synthesis and Characterization of Polythiophenes Bearing Aromatic Groups at the 3-Position
SCIE
SCOPUS
- Title
- Synthesis and Characterization of Polythiophenes Bearing Aromatic Groups at the 3-Position
- Authors
- Ohshimizu, K; Takahashi, A; Rho, Y; Higashihara, T; Ree, M; Ueda, M
- Date Issued
- 2011-02-22
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Regioregular poly(3-(4'-(3 '',7 ''-dimethyloctoxy)phenyl)thiophene) (P3PhT) and poly(3-(4'-(3 '',7 ''-dimethyloctoxy)-3'-pyridinyl)thiophene) (P3PyT) were successfully prepared with reasonably high molecular weights and low polydispersity indices by the Grignard metathesis (GRIM) polymerization. These polymers were found to be thermally stable up to 360-390 degrees C, depending on the phenyl or pyridinyl linker in the bristle. Both polymer films revealed a molecularly multilayer structure (i.e., lamellar structure) whose layers stacked normal to the film plane; each lamella consists of two sublayers, namely ordered and amorphous layers. The amorphous sublayer was composed of a bilayer formed from the bristles. The ordered sublayer in P3PhT consisted of laterally stacked 3-phenylthiophene backbone chains, whereas that of P3PyT consisted of thiophene backbone chains without the pyridinyl linker. These ordered sublayer formations led a longer pi-conjugation length. The enhanced pi-conjugation lengths were reflected in their optical and electronic properties, showing that both P3PhT and P3PyT exhibited a lower highest occupied molecular orbital (HOMO) level and lower energy band gap compared to those of poly(3-hexylthiophene) (P3HT). Overall, the structure and properties of P3PhT and P3PyT make them promising materials for advanced polymer solar cells having an excellent performance.
- Keywords
- X-RAY-SCATTERING; ORGANOSILICATE DIELECTRIC FILMS; CHAIN-GROWTH POLYMERIZATION; THIN-FILMS; MOLECULAR-WEIGHT; BLOCK; POLY(3-HEXYLTHIOPHENE); TRANSISTORS; CELLS; POLY(3-ALKYLTHIOPHENES)
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/25086
- DOI
- 10.1021/MA102661S
- ISSN
- 0024-9297
- Article Type
- Article
- Citation
- MACROMOLECULES, vol. 44, no. 4, page. 719 - 727, 2011-02-22
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- There are no files associated with this item.
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