Abstract
Inverted type CdS/CdSe core/shell heterostructures were synthesized using ultrasonic assisted low cost and environmentally friendly sol–gel route. Cadmium chloride, thiourea and selenium dioxide were used as Cd, S and Se precursors, respectively. The core/shell heterostructures were analyzed by various techniques like X-ray diffraction, high resolution transmission electron microscope (HRTEM), photoluminescence and optical studies. X-ray diffractograms exhibit the cubic phase structure with its peaks shifting towards the lower angle due to compressive strain. Moire fringes are observed in HRTEM images of CdS/CdSe core/shell heterostructure due to lattice mismatch between CdS and CdSe. The interplanar spacing of moire fringes is found to be around 2.38 nm. Photoluminescence studies show the peak shifts towards the higher wavelength due to lattice mismatch between CdS and CdSe. Shift in absorption peak towards the higher wavelength makes them suitable for dye synthesized solar cells.
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