CBSE Class 12 Physics Notes

SemiconductorsandTypesofSemiconductor

Semiconductors – Type, Applications, Uses & Example

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Semiconductors are the materials, whose conductivity lies between metals and insulators. They are characterised by narrow energy gap (≈1eV) between the valence band and conduction band. At room temperature all semiconductors behave like insulator. On the basis of purity, semiconductors are of two types. 1. Intrinsic Semiconductors 2. Extrinsic Semiconductors 1. Intrinsic Semiconductors An intrinsic semiconductors […]

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Difference Between Conductor, Insulator and Semiconductor On The Basis Of Energy Band

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1. Conductor (Metal) In conductor the conduction band and valence band overlap each other. Electron can easily jumped to conduction band and available for conduction of electricity. 2. Insulator In insulator, The Valence band is completely filled and conduction band is completely empty and the energy gap is large. 3. Semiconductor In semiconductor, The valence

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EnergyBandsInSolids 1

Energy Bands In Solids

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Energy Bands In Solids (Conductor, Insulator and Semiconductor) According to Bohr atomic model and concept of electronic configuration in an isolated atom, there are well defined energy levels of electrons in an isolated atom. But in real, isolated atom is not possible. Many atom comes together and form a crystal. In case of crystal, these

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Classificationofmetals2Cconductorsandsemiconductors

Classification of Metals, Conductors and Semiconductors

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On the basis of the relative values of electrical conductivity(σ) and resistivity(ρ=1/σ), the solid are broadly classified as 1. Metals They have very low resistivity or high conductivity. Resistivity ρ ≈ 10⁻² – 10⁻⁸ Ωm  and Conductivity σ = 10²  – 10⁸ S/m (Siemens/metre) 2. Insulators They have high resistivity or low conductivity. Resistivity ρ ≈ 10¹¹ – 10¹⁹ Ωm  and  Conductivity

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