Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/65704
Title: Conjugated oligothiophene derivatives based on bithiophene with unsaturated bonds as building blocks for solution-processed bulk heterojunction organic solar cells
Authors: Cui, C
Wu, Y
Cheung, MS
Ho, CL
Dong, Q
Lin, Z
Li, Y
Wong, WY
Keywords: Alkynes
Conjugation
Oligothiophenes
Organic solar cells
Synthesis
Issue Date: 2016
Publisher: Wiley-VCH
Source: Chemistry, an Asian journal, 2016, v. 11, no. 24, p. 3557-3567 How to cite?
Journal: Chemistry, an Asian journal 
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 %.
URI: http://hdl.handle.net/10397/65704
ISSN: 1861-4728
EISSN: 1861-471X
DOI: 10.1002/asia.201601281
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