Synthesize and characterization of CdSe QDs for enhancing Solar cell efficiency

Cadmium Selenide quantum dots are synthesized by a chemical method in various sizes. These CdSe quantum dots can be used in adsorption of wide range of solar spectrum. The optical properties of these QDs are characterized by ultraviolet-visible and photoluminescence (PL) spectroscopies. The results of absorption and emission spectroscopies show a red shift by increasing the size of QDs. Moreover, transmission electron microscopy (TEM) is applied for investigation on morphology of the nanoparticles. Then CdSe QDs are coated on a Si PV cell with a specific efficiency by drop casting method for I-V characterization. It is found that the CdSe QDs can enhance the efficiency of Si PV cells depending on the nanoparticle size. Studies show that these QDs can increase the efficiency of solar cells about 18.78 % compared to uncoated cell.