Simple metal-free organic D-φ-A dyes with alkoxy-or fluorine substitutions: Application in dye sensitized Solar Cells

作者：Chandrasekharam M.; Chiranjeevi B.; Gupta K.S.V.; Singh S.P.; Islam A.; Han L.; Lakshmi Kantam M.

来源：Journal of Nanoscience and Nanotechnology, 2012, 12(6): 4489-4494.

• Dye-Sensitized Solar Cells
• Metal-Free Sensitizers
• Nanocrystalline TiO 2
• Simple D-φ-A Systems

Two new metal-free organic sensitizers with simplest structural variations have been synthesized for application in nanocrystalline TiO 2 sensitized solar cells. The donor-φ-bridge-acceptor (D-φ-A) structure dyes, Y2 and Y3 each designed with three parts, an electron donor unit (substituted phenyl), a linker unit (thiophene), and an anchor unit (cyanoacrylic acid) showed maximal monochromatic incident photon to current conversion efficiencies (IPCE) in a device reaching upto 67 and 82 respectively. The organic sensitizers with 3,4,5-trimethoxy phenyl (Y3) as donor moieties obtained better solar light to electrical energy conversion efficiencies of 3.30 where as the organic sensitizer with 2,4-difluoro phenyl as donor (Y2) showed comparatively lower efficiency of 1.02. The efficiency obtained with the reference sensitizer N719 under similar fabrication and evaluation conditions was 5.84.