solar cell is used in many countries including Thailand. The efficiency of the solar cell depends on type, ught intensity and temperature. Thermal accumulation in the solar cell causes the te ture increasing that higher temperature lower electrical generation capacity. As some of organic potymer can absorb infrared light in various ranges, carboxymethylcellulose(CMC) and polyvi ide(PVC) were used as the coating materials in this research for reducing the temperatu of solar celu crMo and pvc were modified by silica sol in order to increase the stability of the pot ackbone, 50 mL of 96 ww CMC in water and PwC in F was separately prepared to obtain CMC and PVC respectively. Silica sol was prepared by dissolving 3 g of tetraethytorthosilicat of 1 M HCl to obtain a clear silica sol. It was then separately mixed with CMC and PVC solutions to obtain CMC+SiO and PNC SiO2. The cle of ethanol and subsequently adding 0.25 mL es were dip coated with CMC Pvo, CMC Sio and PwC t Sio.. All coated films were analyzed by IR spectroscopy. The coated slides were then tested under sunught for 6 hours and the e data of the slides were then recorded