The present study comprises the fabrication of dye sensitized solar cells (DSC) and evaluating their performance and stability at 60oC under light soaking with 1 sun light irradiation (1000W/m2, AM 1.5). In order to achieve the long-term stability of devices we designed novel low volatile electrolytes containing ionic liquids in combination with high molar extinction coefficient sensitizers. The initial performances of the devices are between 7 and 8% efficiency at one sun light irradiation. Even after keeping these cells under light and thermal stress the devices show excellent stability over 1000 h, retained more than 90% of their initial values.