Solid-state dye-sensitized solar cells based on spiro-MeOTAD

Dye-sensitized solar cells (DSC) could become low cost alternatives to inorganic photovoltaic devices. The DSC studied here use the hole transporting material 2,2′7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9′-spirobifluorene (spiro-MeOTAD). The effect of t-butyl pyridine (t-BP) on the current–voltage characteristics of thin layer cells were investigated using complete cells and cells consisting only of the TiO₂ blocking layer. In addition, absorption spectroscopy was used to study the effect t-BP has on the doping density of spiro-MeOTAD. The results are correlated with device performance.