Conjugated Oligothiophene Derivatives Based on Bithiophene with Unsaturated Bonds as Building Blocks for Solution-Processed Bulk Heterojunction Organic Solar Cells
| Autor: | Wai Yeung Wong, Cheuk Lam Ho, Chaohua Cui, Yue Wu, Zhenyang Lin, Yongfang Li, Man Sing Cheung, Qingchen Dong |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Organic solar cell Organic Chemistry Energy conversion efficiency Alkyne 02 engineering and technology General Chemistry Conjugated system Electron acceptor 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry Triple bond 01 natural sciences Biochemistry Polymer solar cell 0104 chemical sciences Crystallography chemistry Molecule 0210 nano-technology |
| Zdroj: | Chemistry - An Asian Journal. 11:3557-3567 |
| ISSN: | 1861-4728 |
| Popis: | 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:PC60 BM (1:1, w/w) based device afforded the highest Voc value of 0.96 V and a power conversion efficiency (PCE) of 2.19 %. |
| Databáze: | OpenAIRE |
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