Deposition and characterization Of CdSe nanoparticles multilayer on conductive substrate by chemical bath deposition method
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Date
2016-06
Authors
Sin Khai Wen
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Abstract
In this research, the CdSe nanoparticles were synthesized by using chemical bath deposition method (CBD). CBD method is a very attractive method for producing thin films by large area deposition at low cost. However, CBD method is time consuming. The method requires the presence of cadmium salt, complexing agent and a chalcogen source. To synthesize CdSe nanoparticles, the cadmium sulfate solution is used as the Cd2+ ions source, and the sodium selenosulphate solution is used as the Se2- ions source. The deposition was carried out at different NTA concentration, different time deposition and deposition of CdSe multilayer. The structural properties of the materials have been studied using X-Ray Diffraction pattern and it confirms the formation of CdSe. The formation of Cd(OH)2 and CdO pahse had been identified with FTIR. The optical band gap energy of CdSe solution was studied using UV-Vis. The band gap of CdSe solution obtained is within the range from 1.93 eV to 2.10 eV. However, the measured band gap are found to be higher than bulk band gap of CdSe, Eg = 1.74eV which is due to quantum confinement in the CdSe nanocrystalline. The electrical properties of the solar cell were studied by current-density voltage curve. The samples were prepared by sandwiching the CdSe photoanode and Cu2S photocathode. The highest efficiency of CdSe sensitized QDSSCs is from 240mM NTA concentration which was deposited for 8 hours is 0.694%. For the highest efficiency of CdSe multilayer sensitized QDSSCs, 1st layer is from 240mM NTA concentration which was deposited for 8 hours and 2nd layer is from 120mM NTA concentration which was deposited for 26 hours, is 0.491%.