Synthesis of organic dyes with linkers between 9,9-dimethylfluorenyl terminal and α-cyanoacrylic acid anchor, effect of the linkers on Uv-Vis absorption spectra, and photovoltaic properties in dye-Sensitized solar cells

Abstract

Six metal-free organic dyes having thiophene (1), benzene-thiophene (2), thiophene-benzene (3), thiophene-pyridine (4), thiophene-thiophene (5), and pyridine (6) linkers between 9,9-dimethylfluorenyl terminal group and α-cyano-acrylic acid anchor were synthesized. Among them, organic dye 5 showed the longest λmax value (424 nm) in UV-Vis absorption spectrum, better incident monochromatic photon-to-current conversion efficiency (IPCE), highest short circuit photocurrent density (JSC, 9.33 mA2/cm2), and highest overall conversion efficiency (η, 3.91%).