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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)
ISSN:2141-7016
| Abstract: We determine the optical properties of PbS quantum dot and PbS/CdS core/shell quantum dot investigating the effect of the CdS passivation on the optical properties of the PbS quantum dot. The unpassivated PbS QD exhibit high absorbance value at lower wavelength of 397nm indicating a large increase in the band gap. A band gap of 2.96ev is obtained due to quantum confinement. The unpassivated PbS QD exhibit high absorbance value at higher wavelength of 427nm indicating reduction in the band gap. This spectral response confirms the presence of the CdS QD on the PbS QD. The PbS/CdS core/shell QD has a reduced band gap of 2.57ev when compared to the PbS QD due to quantum size effect. |
| Keywords: Quantum Dots, TiO2, PbS, CdS, SILAR |
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