Zinc selenide

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Zinc selenide
Zinc selenide
ZnSe.jpg
Identifiers
CAS number 1315-09-9 YesY
PubChem 4298215
Properties
Molecular formula ZnSe
Molar mass 144.35 g/mol
Appearance light yellow solid
Density 5.27 g/cm3
Melting point 1,525 °C (2,777 °F)
Solubility in water negligible
Band gap 2.82 eV (10 ºK)
Refractive index (nD) 2.67 (550 nm)
2.40 (10.6 µm)
Structure
Crystal structure Zincblende (cubic)
Lattice constant a = 566.8 pm
Coordination
geometry
Tetrahedral (Zn2+)
Tetrahedral (Se2−)
Thermochemistry
Std enthalpy of
formation
ΔfHo298
−177.6 kJ/mol
Hazards
EU Index 034-002-00-8
EU classification Toxic (T)
Dangerous for the environment (N)
R-phrases R23/25, R33, R50/53
S-phrases (S1/2), S20/21, S28, S45, S60, S61
Related compounds
Other anions Zinc oxide
Zinc sulfide
Zinc telluride
Other cations Cadmium selenide
Mercury selenide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

Zinc selenide (ZnSe), is a light yellow solid compound. It is an intrinsic semiconductor with a band gap of about 2.70 eV at 25 °C (77 °F). ZnSe rarely occurs in nature. It is found in the mineral stilleite named after Hans Stille.

Properties[edit]

ZnSe can be made in both hexagonal (wurtzite) and cubic (zincblende) crystal structure.

It is a wide-bandgap semiconductor of the II-VI semiconductor group (since zinc and selenium belong to the 12th and 16th groups of the periodic table, respectively). The material can be doped n-type doping with, for instance, halogen elements. P-type doping is more difficult, but can be achieved by introducing gallium.

Applications[edit]

Chemistry[edit]

ZnSe is insoluble in water, but reacts with acids to form toxic hydrogen selenide gas.

It can be deposited as a thin film by chemical vapour deposition techniques including MOVPE and vacuum evaporation.

References[edit]

  1. ^ Cr2+ excitation levels in ZnSe and ZnS, G. Grebe, G. Roussos and H.-J. Schulz, J. Phys. C: Solid State Phys. vol. 9 pp. 4511-4516 (1976) doi:10.1088/0022-3719/9/24/020
  2. ^ http://www.kayelaby.npl.co.uk/general_physics/2_5/2_5_8.html Kaye and Laby online at NPL

External links[edit]