Abstract
CdS nanocrystals are synthesized through a chemical bath deposition method. After annealing, these nanocrystals are enlarged according to Scherrer’s formula. Small nanocrystals display wide band gaps as a result of the quantum effect experienced by nanocrystals of a certain size. However, the absorption edge and green and red emissions of annealed CdS nanocrystals show obvious blueshift compared with the as-grown ones. After annealing, the intensity ratio of these green and red emissions increases, which indicated that the defect states are reduced. Therefore, the improvement in crystalline quality and the reduced strain contribute to the unusual blueshifting of the optical band gap and of the green and red emissions.
Highlights
In electronic and optoelectronic devices, semiconductor nanomaterials have attracted considerable attention because of their unique physical and chemical properties, which are novel and are used more extensively than their bulk counterparts [1]
Small nanocrystals typically display wide band gaps because of the quantum confinement effect experienced by grains of a certain size [8]
CdS nanocrystals are fabricated through the chemical bath deposition method
Summary
In electronic and optoelectronic devices, semiconductor nanomaterials have attracted considerable attention because of their unique physical and chemical properties, which are novel and are used more extensively than their bulk counterparts [1]. Among these nanomaterials, CdS is an important II-VI semiconductor that has a direct band gap of 2.42 eV at room temperature. CdS nanocrystals are grown using various techniques, including thermal evaporation [3], chemical vapor deposition [4], radio frequency sputtering [5], and chemical bath deposition (CBD) [6] Among these techniques, CBD is the simplest, coolest, and most economical deposition method for large areas [7]. We ascribe the unusual blueshift of the optical band gap to the improvement in crystalline quality and the reduced strains
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