Electronic properties of polymers based on thienothiadiazole and thiophene

A. K. Bakhshi, Hiroki Ago, Kazunari Yoshizawa, Kazuyoshi Tanaka, Tokio Yamabe

研究成果: ジャーナルへの寄稿記事

28 引用 (Scopus)

抄録

Ab initio crystal orbital (CO) studies on the geometric and the electronic structures of poly(thienothiadiazole) (Poly-1a) and periodic copolymers of thienothiadiazole and thiophene with the ratio of 1:1 (Poly-2b) and 1:2 (Poly-3b) are presented. In Poly-1a and Poly-2b, considerable change in the geometries is found to occur as one moves from their oligomers to the polymers. Although thienothiadiazole oligomers have a very small highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) separation, the corresponding polymer (Poly-1a) has a considerably large band gap. On the contrary, the geometric and electronic structures of Poly-3b are almost identical to those of the oligomer, and Poly-3b possesses a direct band gap of 1.3 eV estimated by simple scaling. The reasons for these differences are discussed in terms of orbital interactions and nonbonding molecular orbitals in the oligomers, and the reduced π-conjugation and enhanced intercell interaction in the polymers.

元の言語英語
ページ(範囲)5528-5538
ページ数11
ジャーナルJournal of Chemical Physics
104
発行部数14
DOI
出版物ステータス出版済み - 1 1 1996
外部発表Yes

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Thiophenes
thiophenes
oligomers
Oligomers
Electronic properties
Polymers
Molecular orbitals
molecular orbitals
polymers
electronics
Electronic structure
Energy gap
electronic structure
orbitals
conjugation
copolymers
Copolymers
interactions
scaling
Crystals

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

これを引用

Electronic properties of polymers based on thienothiadiazole and thiophene. / Bakhshi, A. K.; Ago, Hiroki; Yoshizawa, Kazunari; Tanaka, Kazuyoshi; Yamabe, Tokio.

:: Journal of Chemical Physics, 巻 104, 番号 14, 01.01.1996, p. 5528-5538.

研究成果: ジャーナルへの寄稿記事

Bakhshi, A. K. ; Ago, Hiroki ; Yoshizawa, Kazunari ; Tanaka, Kazuyoshi ; Yamabe, Tokio. / Electronic properties of polymers based on thienothiadiazole and thiophene. :: Journal of Chemical Physics. 1996 ; 巻 104, 番号 14. pp. 5528-5538.
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