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- Title
Conjugated Oligothiophene Derivatives Based on Bithiophene with Unsaturated Bonds as Building Blocks for Solution-Processed Bulk Heterojunction Organic Solar Cells.
- Authors
Cui, Chaohua; Wu, Yue; Cheung, Man ‐ Sing; Ho, Cheuk ‐ Lam; Dong, Qingchen; Lin, Zhenyang; Li, Yongfang; Wong, Wai ‐ Yeung
- Abstract
A new building block ATVTA that uses stiff carbon-carbon triple bonds (A) on 1,2-di(2-thienyl)-ethene (TVT) has been developed. Oligothiophene derivatives S-01 with a TVT unit, S-02 with a 5,5′-diethynyl-2,2′-dithienyl (AT2) unit and S-03 with ATVTA were synthesized to compare their effects in a systematic study. Due to the better π-conjugation extension of the TVT unit, S-01 exhibits the most red-shifted absorption profile among them, whereas S-02 possesses the deepest HOMO level. While the HOMO level of S-03 is down-shifted by 0.02 eV relative to that of S-01, the alkyne linkages can effectively down-shift the HOMO level. By replacing the terminal units of S-03 with stronger electron acceptors, S-04 and S-05 exhibited broader absorption profiles and lower HOMO levels than those of S-03. Organic solar cells based on these molecules were fabricated and an S-03:PC60BM (1:1, w/w) based device afforded the highest Voc value of 0.96 V and a power conversion efficiency (PCE) of 2.19 %.
- Subjects
OLIGOTHIOPHENES; HETEROJUNCTIONS; SOLAR cells; FRONTIER orbitals; UNSATURATED compound synthesis; TRIPLE bonds (Chemistry)
- Publication
Chemistry - An Asian Journal, 2016, Vol 11, Issue 24, p3557
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.201601281