Class 12 Physics Semiconductor Electronics Classification of metals, semiconductors and insulators

Classification of metals, semiconductors and insulators

On the basis of conductivity

The conductivity of a material indicates whether they can be classified as metals, semiconductors or insulators

The electrical conductivity is expressed as σ whereas the reciprocal of conductivity is resistivity ρ = 1/σ

  • Metals – Metals have high conductivity and low resistivity ; ρ is of order10-2 to 10-8 Ω m ; σ is of order 102 to 108 S/m

 

  • Semiconductors – They have conductivity and resistivity in between metals and insulators ; ρ is of order 10-5 to 10-6 Ω m ; σ is of order 105 to 106 S/m

 

  • Insulators – They have high resistivity and hence low conductivity ; ρ is of order 10-11 to 10-19 Ω m ; σ is of order 102 to 1019 S/m

 

Share these Notes with your friends  

< Prev Next >

You can check our 5-step learning process


.