Metal oxides

  • Cadmium Sulfide – Properties, Applications and the Future for CdS

What is cadmium sulfide used for? Is cadmium sulfide toxic? How is CAS different from CdS? How do you make cadmium sulfide

CdS 

Cadmium sulfide is a chemical compound that has the formula CdS. It is yellow in color and is a semiconductor of electricity. It exists as two different polymorphs, hexagonal greenockite, and cubic hawleyite.

Greenlockite

Greenockite is a hexagonal, yellowish crystal. It is a rare mineral and is the only real ore of cadmium. It is a much sought-after mineral because of its beautiful color and crystal habit. It has the same structure as that of zinc-iron sulfide wurtzite. The structure of Greenockite is composed of SCd4 tetrahedrons, which are stacked in a layered structure with every other layer exactly the same in an AB AB AB hexagonal sequence. Crystals of greenockite are typical of six-sided pyramids. In it, the hemimorphic character is easily seen because the top of the crystal is the point and the bottom of it is its base.

Hawleyite

Cubic hawleyite, the other polymorph of Cadmium Sulfide, is a rare sulfide mineral in the sphalerite group, dimorphous and easily confused with greenockite (mentioned above). Chemically, it is cadmium sulfide, and occurs as a bright yellow coating on sphalerite or siderite in vugs, deposited by meteoric waters. It was discovered in 1955 in the Hector-Calumet mine, Keno-Galena Hill area, Yukon Territory and named in honor of mineralogist James Edwin Hawley, a professor at Queen's University in Ontario, Canada.

Major Applications

The main application of Cadmium Sulfide is as a pigment.

Cadmium Sulfide is also used in the production of solar cells where it is used as a buffer layer in the manufacture of CIGS (Copper -Indium-Gallium-Selenide) solar cells. With an increasing interest and uptake of solar cells, this application for cadmium sulfide could also increase..

Other Uses

  • Light-dependent resistors/photoresistors for light sensors
  • Chemical bath deposition, CBD
  • Sol gel techniques
  • MOCVD
  • Sputtering
  • Electrochemical deposition
  • Spraying with precursor cadmium salt, sulfur compound and dopant
  • Screen printing using a slurry containing dispersed CdS

Future of Cadmium Sulfide

While the main use for Cadmium Sulfide has been as a pigment, it is reasonable to expect that the solar cell market will begin to consume more Cadmium Sulfide in the future as the technology becomes more widely accepted and more affordable.


Formula: CdS
Molecular Weight: 144.47 g/mol
Form: Orange hexagonal, cubic crystals
CAS Number: 1306-23-6
Density: 4.826 g/cm³
Synonyms: cadmium(II) sulfide, greenockite, hawleyite, cadmium yellow, sulfanylidenecadmium, Capsebon, Orange cadmium, Cadmopur Yellow, Jaune Brilliant, Aurora Yellow, Ferro Yellow

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Cadmium Sulfide – Properties, Applications and the Future for CdS

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