First-principles study of the electronic and structural properties of (CdTe)n/(ZnTe)n superlattices

Boucharef, M.; Benalia, S.; Rached, D.; Merabet, M.; Djoudi, L.; Abidri, B.; Benkhettou, N.

doi:10.1016/j.spmi.2014.09.014

Cited by 14 publications

(3 citation statements)

References 39 publications

(26 reference statements)

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“…4 s, 4 p, and 3 d electronic states of Zn in the valence band of ZnTe have lower energies than 5s, 5p, and 4d electronic states of Cd in CdTe [20]. Additionally, electronic states of Te including 5 s, 5 p, and 5 s are lower in ZnTe than those states in CdTe [20], probably due to the higher dissociation energy of the Zn-Te bond compared to the Cd-Te bond [21]. The changes in electronic states reduce the density of state near the conduction band edge of CdTe QDs, therefore reducing the absorption cross-section as mentioned above.…”

Section: Resultsmentioning

confidence: 86%

“…The decreased absorption coefficient caused by Zn 2+ incorporation could be explained as follows. 4 s, 4 p, and 3 d electronic states of Zn in the valence band of ZnTe have lower energies than 5s, 5p, and 4d electronic states of Cd in CdTe [20]. Additionally, electronic states of Te including 5 s, 5 p, and 5 s are lower in ZnTe than those states in CdTe [20], probably due to the higher dissociation energy of the Zn-Te bond compared to the Cd-Te bond [21].…”

Section: Resultsmentioning

confidence: 99%

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Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion

Nhàn¹,

Duc²,

Dũng³

et al. 2022

NST

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Water-soluble CdTe quantum dots (QDs) have been utilized as photoluminescence probes for the detection of metal ions such as Pb2+, Hg2+, Cd2+, etc. We initially developed highly photoluminescence (PL) Zn-doped CdTe for toxic ions detection. A study on the changes of optical properties of Zn-doped CdTe and CdTe QDs when exposed to Pb2+ suggested that Pb2+ could act as a surface passivating agent to reduce Te2- dangling bonds while Zn2+ dopant stabilizes the QDs surface against ambient oxidation. The results demonstrated herein provide useful understandings of the interactions between water-soluble QDs and metal ions. These results suggest further applications of QDs in sensing metal ions.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion

Nhàn¹,

Duc²,

Dũng³

et al. 2022

NST

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“…However, the Hg 1−x Zn x Te possesses gap energies from −0.3 eV (HgTe) to 2.38 eV (ZnTe) and mechanical hardness that is greater than those of the Hg 1−x Cd x Te. These alloys are found to have the same nature of gaps [11,12].…”

Section: Introductionmentioning

confidence: 88%

DFT and TB-mBJLDA studies of structural, electronic and optical properties of Hg1-xCdxTe and Hg1-xZnxTe

Aouail¹,

Belkaid²,

Oukebdane³

et al. 2021

Rev. Mex. Fís.

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In this paper, the fundamental semiconductor properties of Hg1-xCdxTe and Hg1-xZnxTe are investigated by ab initio calculations based on the FP-LAPW method. Structural properties have been calculated using LDA and GGA approximations. The electronic properties are studied using the LDA and GGA approximations, and the potential TB-mBJLDA coupled with the lattice parameters aLDA and aGGA. The optical properties are determined from the optimal gap energies based on the TB-mBJLDA potential. Lattice parameters aLDA obtained by the LDA calculations predict values that are in good agreement with the experimental results and are better than those results obtained by the GGA calculations. The use of TB-mBJLDA potential coupled with the lattice parameter aGGA gives gap energy values in good agreement with the experimental results for all alloys except Hg1-xZnxTe (x=0.5, 0.75) where the (TB-mBJ LDA+aLDA) is more suitable. Optical constants are calculated from the dielectric function in the energy range (0-30 eV). The spectrum of real and imaginary parts of the dielectric function, the energy loss function, the refractive index, the extinction coefficient, the absorption coefficient, and the reflectivity show that optical properties of Hg1-xCdxTe are comparable to those of Hg1-xZnxTe. Our results are found to be in reasonable agreement with existing data reported in the literature.

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First-principles study on the electronic and optical properties of the ZnTe/InP heterojunction

Chen

Zhou

2019

J Comput Electron

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First-principles study of the electronic and structural properties of (CdTe)n/(ZnTe)n superlattices

Cited by 14 publications

References 39 publications

Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion

Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion

DFT and TB-mBJLDA studies of structural, electronic and optical properties of Hg1-xCdxTe and Hg1-xZnxTe

First-principles study on the electronic and optical properties of the ZnTe/InP heterojunction

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