Effects of ethynyl unit and electron acceptors on the performance of triazatruxene-based dye-sensitized solar cells. (15th February 2018)

• Record Type: Journal Article
• Authors: Pan, Bin; Zhu, Yi-Zhou; Ye, Dan; Li, Feng; Guo, Yi-Fan; Zheng, Jian-Yu
• Is Part Of: New journal of chemistry. Volume 42:Number 6(2018)
• Page Start: 4133
• Page End: 4141
• Publication Date: 2018-02-15
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c7nj04629d
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Effects of ethynyl unit and electron acceptors/anchors on the photovoltaic performance of triazatruxene-based organic dyes were systematically investigated. Abstract : Metal-free organic dyesJY43–JY46 based on the triazatruxene donor were synthesized for dye-sensitized solar cells (DSSCs), where the effects of ethynyl unit and electron acceptor/anchor were systematically investigated. Compared to dyesJY45 andJY46, JY43 andJY44 containing an additional ethynyl unit in the molecular structure showed higher molar absorption coefficients, respectively. The strongly electron-withdrawing cyanoacrylic acid seemed helpful for dyes to achieve better light harvesting ability compared with dyes having carboxylic acid groups, resulting in the enhancement of the dyes' photocurrents. Notably, dyesJY43 andJY45 incorporating carboxylic acid anchors exhibited more effective suppression of charge recombination and longer lifetimes of excited electrons, therefore delivering higher photovoltages. Under standard light irradiation (AM 1.5G), the dyeJY43 with an ethynyl unit and carboxylic acid in its skeleton gave the highest power conversion efficiency of 7.51% in the iodine electrolyte.