Push-pull type material having spirobifluorene as π-spacer for dye sensitized solar cells

Two organic dyes for dye-sensitized solar cells (DSSC) based on spirobifluorene were synthesized and characterized. Electrochemical, spectroscopic and photovoltaic properties of the dyes have been investigated. Hexyloxy substituted triarylamine was used as electron donating moiety in the molecule while spirobifluorene and cyanoacrylic acid were used as π-bridge and acceptor groups, respectively. MK162-sensitized solar cells exhibited a short-circuit current (ISC) of 4,92 mA cm−2, an open-circuit voltage (VOC) of 520 mV and a fill factor (FF) of 0.59, resulting an overall power conversion efficiency of 1,52 where the reference cell, Z907 was yielded an overall conversion efficiency of 4.08% efficiency with 620 mV of VOC and 14.51 mA cm−2 of ISC under standard AM 1.5 illumination.