SEMICONDUCTOR MATERIALS BASED ON АII-ВVI COMPOUNDS

  • Development and fabrication of AIIBVI compound single crystals and these compounds solid solutions for IR-equipment, dosimetry, optoelectronics elemental base, medical equipment, inspection equipment and radiation safety devices
  • Development and synthesis of polycrystalline ultrapure compounds of AIIBVI type used as sources at single crystal growth and spraying
  • Development of basic processes, materials, structures and crystal elements of devices on the basis of AIIBVI Group compounds, with new functional characteristics, and arrangement of their experimental-industrial production
  • Development of new materials for prospective designs in the field of energy sector, communication systems, navigation, ecologic monitoring

 

FIELDS OF APPLICATION

Zink selenide (ZnSe) Cyan and blue color radiation sources, IR-optics passive elements, IR-optics Cr, Te active elements and X-ray sensitive detectors, substrates for epitaxy.
Cadmium telluride (CdTe)
Zink telluride (ZnTe)
Solid solution ( CdZnTe)		 Electro-optical modulators, X-ray and radioactive radiation detectors, IR-detectors and IR-optics elements, substrates for epitaxy.
Cadmium selenide (CdSe)
Cadmium sulphide (CdS)
Solid solutions (CdSSe), (ZnCdS)		 Tunable IR-lasers, lasers with electron-beam pumping in radiation visible region, wave plates for IR-optics.

 

SPECIFICATION

Zinc selenide (ZnSe), cadmium telluride (CdTe), cadmium sulphide (CdS), cadmium selenide (CdSe), zinc telluride (ZnTe)

  Parameters
ZnSe CdTe CdS CdSe ZnTe
Energy gap width, eV 2,7 1,5 2,42 1,72 2,23
Crystal structure cubic cubic hexagonal hexagonal cubic
Lattice constant, Å 5,67 6,48 4,137
6,71		 4,29
7,01		 6,10
Diameter, mm 50 50 100 100 50
Dislocation density, cm-2 < 5×103 < 5×104 < 2×104 < 5×104 < 5×104
Growth method vapor-phase, melt vapor-phase, melt vapor-phase vapor-phase vapor-phase
Transmission range, µm 0,5 -19 1 - 28 0,5 - 16 0,8 - 23 0,5 - 26
Exciton band wavelenght inluminescence in spectrum, nm 444 ± 2 795 ± 2 487 ± 2 690 ± 2 528 ± 2
Orientation (111), (100) (111), (110)
(013)		 (0001),
(1010), (1120)		 0001),
(1010), (1120)		 (111)
Dopant Cr, Te In, Cl In, Cu, Ag In, Cu, Ag -
Optical absorption(volume)at 10,6 µm, cm-1 < 5×10-3 < 5×10-3 < 1×10-2 < 1×10-2 < 1×10-2