Synthesis and photovoltaic properties of new branchlike organic dyes containing benzothiadiazole or triphenylamine-linked consecutive vinylenes units

• Published in: Dyes and pigments Vol. 97; no. 3; pp. 405 - 411
• Main Authors: Wang, Changwei, Fang, Yan, Cao, Zhencai, Huang, Hui, Zhao, Bin, Li, Haohao, Liu, Ying, Tan, Songting
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2013
• Subjects: Benzothiadiazole; Branchlike dye; Consecutive vinylenes; Dye-sensitized solar cells; Photovoltaic performance; Red-shifted absorption; Consecutive vinylenes; Red-shifted absorption; Benzothiadiazole; Dye-sensitized solar cells; Branchlike dye; Photovoltaic performance
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2013.01.009

Two novel branchlike organic dyes (WD1 and FD1) based on 4,7-bis-(4-hexylthiophen-2-yl)benzo[1,2,5]thiadiazole (DTBT) and triphenylamine, containing vinylenes and consecutive vinylenes as π-conjugated unit, respectively, were designed and synthesized for dye-sensitized solar cells (DSSCs). The photophysical, electrochemical and photovoltaic properties of the dyes were investigated. The introduction of consecutive vinylenes into two branches of the FD1 molecule leads to a remarkably red-shifted absorption and higher molar extinction coefficient compared with the reference dye D2. The DSSCs based on FD1 and WD1 dyes exhibited the power conversion efficiency of 7.04% and 2.18% under AM1.5G irradiation (100mW/cm2). [Display omitted] ► Two branchlike organic dyes have been designed and synthesized. ► The introduction of consecutive vinylenes leads to high molar extinction coefficient. ► The DSSCs based on FD1 dye exhibited the maximum power conversion efficiency of 7.04%.