Cadmium Sulfide (CdS) Semiconductors

Topics Covered

Description
Applications
Chemical Properties
Electrical Properties
Thermal, Mechanical and Optical Properties
Safety Information

Description

Cadmium sulfide is an inorganic compound with the chemical formula CdS. It is a yellow solid and a semiconductor of electricity. It occurs in nature with two different polymorphs, cubic hawleyite and hexagonal greenockite. However, it is more common as an impurity substituent in the similarly structured ores of zinc, wurtzite and sphalerite, which are the major sources of cadmium.

Applications

Cadmium sulfide is mainly used as a pigment owing to its good thermal stability, light and weather fastness, chemical resistance and high opacity.

Other applications of cadmium sulfide are listed below:

  • Photoresistors
  • Thin-film transistors
  • Transducers
  • Solar cells
  • Electrochemical deposition
  • Sol gel techniques
  • Screen printing.

Chemical Properties

The chemical properties of cadmium sulfide are provided in the table below:

Chemical Properties
Chemical Formula CdS
Molecular Weight 144.48
CAS No. 1306-23-6
Group Cadmium - 12
Selenium -16
Crystal Structure Hexagonal, Cubic
Lattice Constants a=4.160 Å
c=6.756 Å

Electrical Properties

The electrical properties of cadmium sulfide are provided in the table below:

Electrical Properties
Dielectric Constant 8.9
Band Gap 2.42 eV
Electron Mobility 350 cm2/Vs
Hole Mobility 40 cm2/Vs

Thermal, Mechanical and Optical Properties

The thermal, mechanical and optical properties of cadmium sulfide are provided in the tables below:

Thermal Properties
Thermal Expansion Coefficient a 1=6.26´10-6/K
a 3=3.5´10-6/K
Specific Heat Capacity 0.47 J/gK
Thermal Conductivity 40.1 W/mK
Mechanical Properties
Young’s Modulus 45 GPa
Melting Point 1750°C
Boiling Point 980°C
Density 4.826 g/cm3
Optical Properties
Refractive Index 2.529

Safety Information

Safety Information
GHS Hazard Statements H225 - Highly flammable liquid and vapour
H304 - May be fatal if swallowed and enters airways
H315 - Causes skin irritation
H336 - May cause drowsiness or dizziness
H350 - May cause cancer
H373 - may cause damage to organs through prolonged or repeated exposure
Safety Precautions P201 - Obtain special instructions before use
P210 - Keep away from heat/sparks/open flames/hot surfaces
P261 - Avoid breathing dust/fame/gas/mist/vapors/spray
P281 - Use personal protective equipment as required
P 301+ P310 - Immediately call poison center or doctor if swallowed.

Comments

  1. nikhil verma nikhil verma India says:

    Can you give details of CdS IN ELECTRONICS APPLICATION

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