Effect of π-spacers and anchoring groups on the photovoltaic performances of ullazine-based dyes. Issue 74 (22nd July 2016)

• Record Type: Journal Article
• Authors: Qiao, He; Deng, Yanghua; Peng, Ruipeng; Wang, Guo; Yuan, Jing; Tan, Songting
• Is Part Of: RSC advances. Volume 6:Issue 74(2016)
• Page Start: 70046
• Page End: 70055
• Publication Date: 2016-07-22
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra11918b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Three ullazine-based organic sensitizers were designed, synthesized and applied in dye-sensitized solar cells (DSSCs). The tuning of π-spacers and anchoring groups led to a variation of the photovoltaic performances. Abstract : Three ullazine-based organic sensitizers (QD1, QD2 andQD3 ) have been designed, synthesized, and characterized for dye-sensitized solar cells (DSSCs). Ullazine possesses some attractive properties, such as a planar π-system to promote intensely the intramolecular charge transfer (ICT) between ullazine donor units and cyanoacrylic acid or carboxylic acid acceptor units. The tuning of π-spacers and anchoring groups led to variation of the photovoltaic performances. The DSSC based onQD1 with a cyanoacrylic acid and ethylene, obtained a PCE of 5.28%, which was higher than that ofQD2 with a carboxylic acid and phenylethylene, andQD3 with a carboxylic acid and thiophene ethylene. The absorption spectra ofQD2 andQD3 with the increasing of the length of the π-spacers are blue-shifted compared to that ofQD1 . The absorbed amount ofQD1 was the highest of all, contributing to the highest J sc of 12.28 mA cm −2 . The different V oc values, in the order ofQD1 (0.65 V) >QD2 (0.60 V) >QD3 (0.53 V), are caused by the charge recombination rates at the TiO2 /dye/electrolyte interface and the electron lifetimes.