Urea as a long-term stable alternative to guanidium thiocyanate additive in dye-sensitized solar cell

► GSCN additive shows poor stability with time. ► Dye analogue crystals form in the presence of GSCN. ► GSCN leads to dye desorption. ► Urea is found to be an additive alternative to GSCN. ► Urea shows almost the same performance after 40 days.