Electrical and photophysical analyses on the impacts of arylamine electron donors in cyclopentadithiophene dye-sensitized solar cells

• DOI: 10.1039/c1ee02432a
• Publication Date: 2011-10-06T08:30:48Z
• Authors: Mingfei Xu; Difei Zhou; Ning Cai; Jingyuan Liu; Renzhi Li; Peng Wang
• Keywords: Triphenylamine; Electron donor; Carbazole; Electron acceptor; BODIPY

The electron donor of a D-π-A dye is known for its capability to tune both the electronic trait and packing mode molecules chemisorbed on titania nanocrystals dye-sensitized solar cells (DSCs), bringing opportunity impact cell performance by modulating physicochemical characteristics at titania/dye/electrolyte interface. In this paper, we scrutinize influences arylamine donors optoelectronic features thin-film DSCs employing tris(1,10-phenanthroline)cobalt(II/III) redox electrolyte, use four cyclopentadithiophene dyes (C218, C244, C245 C246) with respective dihexyloxy-, diphenothiazinyl- or di-tert-butylphenyl-substituted triphenylamine N-hexyl-carbazole donors. Amongst these donors, dihexyloxy-substituted found present strongest electron-donating capacity, endowing corresponding C218 evidently red-shifted light absorption in comparison other three congeners. Transient measurements show that all exhibit expeditious regeneration, guaranteeing efficient long-distance charge separation titania/dye/redox couple Furthermore, it worthwhile noting prompts highest open-circuit photovoltage amongst chromophores, which primarily attributed positive effect slow cobalt(III) interception electrons, highlighting superiority applying as dye.