CdBr2 - P-3m1

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1. Structure Summary

Last Updated

2022-04-20

Crystal Prototype

AB2

Crystal System

Hexagonal

Lattice Constant a (Å)

3.957

Lattice Constant b (Å)

3.957

Space Group

P-3m1

Formation Energy (eV/f.u.)

-2.2142

2. Mechanical Properties (PBE)

2.1 Stiffness Tensors

Cij (N/m)

xx

yy

zz

xx

27.846

9.131

0.000

yy

9.131

27.846

0.000

zz

0.000

0.000

9.358

2.2 Compliance Tensors

Sij (m/N)

xx

yy

zz

xx

0.040238

-0.013195

0.000000

yy

-0.013195

0.040238

0.000000

zz

0.000000

0.000000

0.106860

2.3 Orientation-Dependent Mechanical Properties

../_images/ELASTIC-CdBr2_P-3m1.png

2.4 Anisotropic Mechanical Properties Of 2D Singlecrystal

Mechanical Properties

Min

Max

Anisotropy

Young’s Modulus (N/m)

24.852

24.853

1.000

Shear Modulus (N/m)

9.357

9.358

1.000

Poisson’s Ratio

0.328

0.328

1.000

2.5 Anisotropic Mechanical Properties Of 2D Polycrystal

Mechanical Properties

Min

Max

Anisotropy

Young’s Modulus (N/m)

18.489

18.489

1.000

Shear Modulus (N/m)

9.358

9.358

1.000

3. Fundmental Electronic Properties

Band Character

Direct

Band Gap (PBE, eV)

3.2591

Band Gap (HSE, eV)

4.4237

Ionization Energy (HSE, eV)

-7.950

Electron Affinity (HSE, eV)

-3.527

Effective Mass of Electron Max. (m0)

0.388

Effective Mass of Electron Min. (m0)

0.388

Effective Mass of Hole Max. (m0)

8.230

Effective Mass of Hole Min. (m0)

4.397

Location of Valence Band Maximum

[0.000000, 0.000000]

Location of Conduction Band Minimum

[0.000000, 0.000000]

3.1 Global Band Structure (PBE)

../_images/3D_band-CdBr2_P-3m1.jpg

3.2 Band Structure and Density of States (PBE)

../_images/BAND_LDOS-CdBr2_P-3m1.png

3.3 Projected Band Structure and Density of States (PBE)

../_images/BAND_PDOS_Br-CdBr2_P-3m1.png ../_images/BAND_PDOS_Cd-CdBr2_P-3m1.png

3.4 Orientation-Dependent effective Masses (PBE)

../_images/EMC-CdBr2_P-3m1.png

4. Optical Spectrums (HSE)

../_images/Optical-CdBr2_P-3m1.png

5. Phonon Spectrum and Density of States (PBE)

../_images/phonon_BAND_LDOS-CdBr2_P-3m1.png

References

Note

For more details of this database, please refer to the following reference.

[1] V. Wang, R.-T. Wang, G. Tang, Y.-Y. Liang, Y. Kawazeo, J. Nara, W.-T. Geng, High-Throughput Computational Screening of Two-Dimensional Semiconductors, arXiv:1806.04285.

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