Size and shape effects on the band gap of semiconductor compound nanomaterials

Abstract

The size-and shape-dependent band gap energy of semiconductor compound nanomaterials (SCNs) is formulated. The model theory is based on the cohesive energy of the nanocrystals compared to the bulk crystals. We have considered CdSe, CdTe, ZnS, ZnSe and ZnTe semiconductors compounds for the study of size-and shape-dependent band gap energy. It is found that the band gap energy of SCN depends upon the particle size and shape. The model predicts that the band gap energy increases as particle size of the semiconductor nanomaterials decreases. The results obtained are compared with the available experimental data, which support the validity of the model reported.

The modification of surface, size and shape of barium zirconate powder via salt flux

“…This result agrees well with the interpretation from Cavalcante et al , in that the optical band gap is controlled by the structural order‐disorder degree and also point defects in the BaZrO 3 lattice . On the other hand, the increase of energy band gap is also related to the decreasing particle size …”

“…49 On the other hand, the increase of energy band gap is also related to the decreasing particle size. 50,51 Room temperature PL emission spectra of the sub-μm-BaZrO 3 powder product, in comparison to the µm-BaZrO 3 precursor after excitation at 350.7 nm (3.52 eV), are displayed in Figure 8. The intense blue-green PL spectra, with maximum emission at around 568 and 557 nm for nm-and µm-BaZrO 3 , respectively, are associated with structural order-disorder degrees or point defects in the BaZrO 3 lattice, which sheds light on the structural deformation effects in the electronic structure.…”

Applications of nano-materials in diverse dentistry regimes

“…Thus, they are highly prominent materials in photo-catalysis, photo optics, and electronic devices. 46…”

Behavioral analysis of simultaneous photo-electro-catalytic degradation of antibiotic resistantE. coliand antibioticviaZnO/CuI: a kinetic and mechanistic study

“…However, the band gap of a semiconductor can be tuned by the method of preparation and particle size of the particles. 20 In the present study, an effort has been successfully made to synthesize a ZnO/CuI composite on an FTO substrate. A vertically aligned ZnO nanorods array has been grown on the FTO substrate using the hydrothermal approach followed by SILAR for growth of CuI.…”