Distinguish between ‘intrinsic’ and ‘extrinsic’ semiconductors.

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An intrinsic semiconductor material is chemically very pure and possesses poor conductivity. It has equal numbers of negative carriers (electrons) and positive carriers whereas an extrinsic semiconductor is an improved intrinsic semiconductor with a small amount of impurities added by a process, known...
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An intrinsic semiconductor material is chemically very pure and possesses poor conductivity. It has equal numbers of negative carriers (electrons) and positive carriers whereas an extrinsic semiconductor is an improved intrinsic semiconductor with a small amount of impurities added by a process, known as doping, which alters the electrical properties of the semiconductor and improves its conductivity. read less
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Intrinsic semiconductor: An intrinsic semiconductor material is chemically very pure and possesses poor conductivity. It has equal numbers of negative carriers (electrons) and positive carriers (holes). A silicon crystal is different from an insulator because at any temperature above absolute zero temperature,...
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Intrinsic semiconductor: An intrinsic semiconductor material is chemically very pure and possesses poor conductivity. It has equal numbers of negative carriers (electrons) and positive carriers (holes). A silicon crystal is different from an insulator because at any temperature above absolute zero temperature, there is a finite probability that an electron in the lattice will be knocked loose from its position, leaving behind an electron deficiency called a "hole".If a voltage is applied, then both the electron and the hole can contribute to a small current flow. Extrinsic Semiconductor An extrinsic semiconductor is an improved intrinsic semiconductor with a small amount of impurities added by a process, known as doping, which alters the electrical properties of the semiconductor and improves its conductivity. Introducing impurities into the semiconductor materials (doping process) can control their conductivity. Doping process produces two groups of semiconductors: the negative charge conductor (n-type) and the positive charge conductor (p-type). Semiconductors are available as either elements or compounds. Silicon and Germanium are the most common elemental semiconductors. Compound Semiconductors include InSb, InAs, GaP, GaSb, GaAs, SiC, GaN. Si and Ge both have a crystalline structure called the diamond lattice read less
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Intrinsic Semiconductors 1. Intrinsic semiconductors, also called an undoped semiconductors or i-type semiconductor, are pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount...
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Intrinsic Semiconductors 1. Intrinsic semiconductors, also called an undoped semiconductors or i-type semiconductor, are pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities. 2. Conductivity of intrinsic semiconductors is poor . 3. Number of electrons in conduction band and holes in valence band are approximately equal . 4. Fermi energy level lies at the centre of forbidden energy gap. Extrinsic Semiconductors 1. These are impure semiconductors . When a small quantity of impurity is mixed in a pure or intrinsic conductor , conductivity of semiconductor increases . Such an impure semiconductor is called extrinsic semiconductor. 2. Conductivity of extrinsic semiconductors is large. 3. If it is an n-type electrons are in majority and if it is a p-type holes are in majority . 4. In n-type Fermi-level lies near the bottom of conduction band and in p-type near the top of valence base . read less
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B.Tech(EC/EE/IN),Math(IX,X,XI,XII std.),Physics(IX,X,XI,XII std.) CBSE/ICSE/IB.

These are impure semiconductors . When a small quantity of impurity is mixed in a pure or intrinsic conductor , conductivity of semiconductor increases . Such an impure semiconductor is called extrinsic semiconductor
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Intrinsic Semiconductor : 1.)These are pure semiconductor without any significant dopant species present. it is also called i-type semicondoctor. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities. 2.) Conductivity of intrinsic...
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Intrinsic Semiconductor : 1.)These are pure semiconductor without any significant dopant species present. it is also called i-type semicondoctor. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities. 2.) Conductivity of intrinsic semiconductors is poor . 3.) Number of electrons in conduction band and holes in valence band are approximately equal . 4.) Fermi energy level lies at the centre of forbidden energy gap. Extrinsic Semiconductors : 1.) These are impure semiconductors . When a small quantity of impurity is mixed in a pure or intrinsic conductor , conductivity of semiconductor increases . Such an impure semiconductor is called extrinsic semiconductor. 2.) Conductivity of extrinsic semiconductors is large. 3.) If it is an n-type semiconductor , electrons are majority carrier and holes are minority carrier and if it is a p-type semiconductor ,holes are majority carrier and electrons are minority carrier. 4.) In n-type semiconductor,Fermi-level lies near the bottom of conductioin band and in p-type semiconductor, fermi - level lies near the top of valence band . read less
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