What is an extrinsic semiconductor or doped?

What is an extrinsic semiconductor or doped?
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Answer :

A semiconductor whose conductivity is enhanced by addition of minute traces ofimpurities is called doped or extrinsic semiconductor.
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Related questions

A doped semiconductor is called : a) Extrinsic b) Intrinsic c) Insulator d) Conductor

Description : A doped semiconductor is called : a) Extrinsic b) Intrinsic c) Insulator d) Conductor

Last Answer : b) Intrinsic

How are extrinsic semiconductors classified?

Description : How are extrinsic semiconductors classified?

Last Answer : Extrinsic semiconductors are classified into two types depending upon the type of impurity added into a) n-type semiconductor b) p-type semiconductors.

What is a semiconductor diode or junction diode?

Description : What is a semiconductor diode or junction diode?

Last Answer : A diode is a single crystal of semiconducting material which is doped one side with a donor impurity and the other side with acceptor impurity.

Explain the formation of a p-type semiconductor.

Description : Explain the formation of a p-type semiconductor.

Last Answer : When a small amount of a trivalent impurity like Boron, Indium, Aluminium or Gallium is added to a tetra valant element like Silicon or Germanium, three electrons of each impurity atoms ... and becomes n-type semiconductor. In an ntype semiconductor the majority charge carriers are holes.

Explain the formation of an n-type semiconductor.

Description : Explain the formation of an n-type semiconductor.

Last Answer : When a small amount of a penta valant impurity like antimony, arsenic or phosphorous is added to a tetra valant element like Silicon or Germanium, four out of five electrons of each impurity ... becomes an n-type semiconductor. In an n-type semiconductor the majority charge carriers are electrons.

What is an intrinsic semiconductor or pure semiconductor?

Description : What is an intrinsic semiconductor or pure semiconductor?

Last Answer : A semiconductor in which the number of holes and electrons are equal is called intrinsic orpure semiconductor.

What is material used in making semiconductor?

Description : What is material used in making semiconductor?

Last Answer : Silicon & Germanium are the raw materials used for making semiconductor. Semiconductors are located between conductors & insulators in the resistivity spectrum & allow current to flow only under certain conditions. 

When a semiconductor is doped with a P-type impurity, each impurity atom will (A) acquire negative charge. (B) acquire positive charge. (C) remain electrically neutral. (D) give away one electron.

Description : When a semiconductor is doped with a P-type impurity, each impurity atom will (A) acquire negative charge. (B) acquire positive charge. (C) remain electrically neutral. (D) give away one electron.

Last Answer : (A) acquire negative charge.

A P-type semiconductor is doped to produce one of the following. Will it produce: w) both holes and electrons x) positive electrons y) negative electrons z) holes

Description : A P-type semiconductor is doped to produce one of the following. Will it produce: w) both holes and electrons x) positive electrons y) negative electrons z) holes

Last Answer : ANSWER: Z -- HOLES

Why is an intrinsic semiconductor doped?

Description : Why is an intrinsic semiconductor doped?

Last Answer : Intrinsic semiconductor is doped in order to increase conductivity of semiconductor. Doping increases majority charge carries either electrons or holes and majority charge carriers responsible for electric current. 

While comparing doped semiconductor vs. un-doped semiconductor, which of the following

Description : While comparing doped semiconductor vs. un-doped semiconductor, which of the following statements is NOT true ? (A) Doped semiconductor has smaller band-gap compared to un-doped semiconductor (B) ... to un-doped semiconductor (D) Doped as well as un-doped semiconductor have equal bandwidth

Last Answer : While comparing doped semiconductor vs. un-doped semiconductor, which of the following statements is NOT true ? (A) Doped semiconductor has smaller band-gap compared to un-doped semiconductor (B) ... to un-doped semiconductor (D) Doped as well as un-doped semiconductor have equal bandwidth

When the temperature of a doped semiconductor is increased, its conductivity...

Description : When the temperature of a doped semiconductor is increased, its conductivity  (1) Decreases (2) Increases (3) Does not change (4) Increases or decreases depending on whether it is p-type or n-type

Last Answer : When the temperature of a doped semiconductor is increased, its conductivity Increases.

When Arsenic atoms are added Germanium lattice, it becomes a/an - (1) Insulator (2) Superconductor (3) Intrinsic semiconductor (4) Extrinsic semiconductor

Description : When Arsenic atoms are added Germanium lattice, it becomes a/an - (1) Insulator (2) Superconductor (3) Intrinsic semiconductor (4) Extrinsic semiconductor

Last Answer : (4) Extrinsic semiconductor Explanation: When a peritavalent (donor) impurity, like arsenic, is added to germanium, it will form covalent bonds with thegermanium atoms, leaving 1 electron relatively ... this manner - either with Nor P-type impurities - are referred to as EXTRINSIC semiconductors.

In a transistor, the base is _______. (1) an insulator (2) a conductor of low resistance (3) a conductor of high resistance (4) an extrinsic semiconductor

Description : In a transistor, the base is _______. (1) an insulator (2) a conductor of low resistance (3) a conductor of high resistance (4) an extrinsic semiconductor

Last Answer : (2) a conductor of low resistance Explanation: A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.

Differentiate between intrinsic and extrinsic semiconductor

Description : Differentiate between intrinsic and extrinsic semiconductor

Last Answer : Pure form of semiconductors are said to be intrinsic semiconductor. Ex: germanium, silicon. It has poor conductivity If certain amount of impurity atom is added to intrinsic semiconductor the resulting semiconductor is Extrinsic or impure Semiconductor It has good conductivity.

The conductivity of an extrinsic semiconductor (A) decreases with temperature. (B) increases with temperature. (C) remains constant with temperature. (D) decreases and then increases with temperature.

Description : The conductivity of an extrinsic semiconductor (A) decreases with temperature. (B) increases with temperature. (C) remains constant with temperature. (D) decreases and then increases with temperature.

Last Answer : (B) increases with temperature.

n-type semiconductor is an example of (A) extrinsic semiconductor. (B) intrinsic semiconductor. (C) super conductor. (D) insulators..

Description : n-type semiconductor is an example of (A) extrinsic semiconductor. (B) intrinsic semiconductor. (C) super conductor. (D) insulators..

Last Answer : (A) extrinsic semiconductor.

When Arsenic atoms are added to Germanium lattice, it becomes a/an (1) Insulator (2) Superconductor (3) Intrinsic semiconductor (4) Extrinsic semiconductor

Description : When Arsenic atoms are added to Germanium lattice, it becomes a/an (1) Insulator (2) Superconductor (3) Intrinsic semiconductor (4) Extrinsic semiconductor

Last Answer : Extrinsic semiconductor

Define intrinsic and extrinsic semiconductor.

Description : Define intrinsic and extrinsic semiconductor. 

Last Answer : Intrinsic – Semiconductor in pure form is called as intrinsic semiconductor. Extrinsic – Semiconductor with added impurity is called as extrinsic semiconductor.

Compare intrinsic and extrinsic semiconductor

Description : Compare intrinsic and extrinsic semiconductor

Last Answer : Intrinsic semiconductor Extrinsic Semiconductor Pure form of semiconductor Impure form of semiconductor No. electrons and holes are equal  No. of electrons and holes are not equal Electrical ... e.g. Ge, Si semiconductor e.g. p-type or n-type semiconductor

Define the term-Dopant, Extrinsic semiconductor.

Description : Define the term-Dopant, Extrinsic semiconductor. 

Last Answer : Dopant: - An element or compound used to dope a semiconductor is called dopant.  Extrinsic Semiconductor:- In order to increase current carrying capacity some impurity are added in a semiconductor such semiconductor are called extrinsic Semiconductor. 

At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because

Description : At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because (A) Of drive in diffusion of dopants & carriers. (B) Band to band transition dominates impurity ionization. (C) ... band to band transition. (D) Band to band transition is balanced by impurity ionisation.

Last Answer : At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because Impurity ionization dominates band to band transition.

When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on……

Last Answer : When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on Minority carriers.

The impurity level in an extrinsic semiconductor is about ….. of pure semiconductor.

Last Answer : The impurity level in an extrinsic semiconductor is about 1 atom for 108 atoms of pure semiconductor.

The conductivity of an extrinsic semiconductor with temperature

Last Answer : The conductivity of an extrinsic semiconductor with temperature remains constant.

Mention the uses of superconductors.

Description : Mention the uses of superconductors.

Last Answer : a) Superconductors are used in powerful electromagnets. b) High temperature super conductors are used in microwave devices. c) Superconductor magnets are used in Magnetic Resonance Imaging (MRI)

What is the most important feature of a superconductor?

Description : What is the most important feature of a superconductor?

Last Answer : The most important feature of a superconductor is that once current is setup in a superconductor ring, it will continue indefinitely even if the battery connected is switched off.

What is critical temperature?

Description : What is critical temperature?

Last Answer : The temperature below which material becomes superconductor is called critical temperature.

What are superconductors? Give example.

Description : What are superconductors? Give example.

Last Answer : The materials which show property of superconductivity are called superconductors. Example: Mercury, oxide of compound of Lanthanum, Barium and copper.

What is meant by superconductivity?

Description : What is meant by superconductivity?

Last Answer : The property by which certain materials show almost zero resistance at a very low temperature is called superconductivity. Ex: The resistance of mercury drops abruptly to zero at 4.2K

What is an oscillator?

Description : What is an oscillator?

Last Answer : Oscillator is a device to produce electric oscillations of a desired frequency.

Mention the applications of transistor.

Description : Mention the applications of transistor.

Last Answer : a) Transistor is used in amplifier. b) It is used in oscillator. c) It is used in switching circuits.

Write the principle of a transistor or amplifier.

Description : Write the principle of a transistor or amplifier.

Last Answer : A small change in the input signal (voltage) results a large change in the output signal (voltage).

Write about the biasing of a transistor.

Description : Write about the biasing of a transistor.

Last Answer : Emitter base junction is forward biased while collector base junction is reverse biased.

Name the types of transistor.

Description : Name the types of transistor.

Last Answer : a) Bipolar Junction Transistor (BJT) b) Field Effect Transistor (FET) c) Metal Oxide Semiconductor Field Effect Transistor (MOSFET) d) Junction Effect Transistor (JET)

Write the functions of the tree regions of a transistor.

Description : Write the functions of the tree regions of a transistor.

Last Answer : a) Emitter: It is of moderate size and heavily doped. It emits large number of majority carriers for the flow of current through the transistor. b) Base: It is the central region of the ... larger in size compared to emitter. It collects a major portion of majority carriers supplied by the emitter.

What is a transistor? Name its three regions.

Description : What is a transistor? Name its three regions.

Last Answer : Transistor is the short form of transfer resistor. It is a device having three terminal semiconductor. A transistor has two ends regions called emitter and collector. The middle is called base.

Mention the different types of diodes and one use of each.

Description : Mention the different types of diodes and one use of each.

Last Answer : a) Light Emitting Diode (LED): They are used in lighting, display units of electric and electronic devices. b) Zener diode: It is used in voltage stabilizers. c) Photodiode: It is used in light sensitive semiconductors. d) Laser diode: It is used in fiber optical fibre communications.

Mention the applications of a diode.

Description : Mention the applications of a diode.

Last Answer : a) Diode is used to convert A.C into D.C. b) They are used in voltage regulation systems. c) They are used in logic circuits which are used in computers.

Mention the characteristics of a diode.

Description : Mention the characteristics of a diode.

Last Answer : a) Diode has a p-type semiconductor at one end and a n-type semiconductor on the other end. b) It can be biased by connecting to an external source of e.m.f c) It may be forward biased or reverse biased. d) It allows current to pass through in one direction only.

Name the types of rectifier.

Description : Name the types of rectifier.

Last Answer : The two types of rectifier are: a) Half wave rectifier b) Full wave rectifier.

Why is a diode called as rectifier?

Description : Why is a diode called as rectifier?

Last Answer : Diode allows current to pass only when it is forward biased when AC voltage is applied across a diode. This property is used to rectify AC voltage. Hence a diode is called as rectifier.

What is a rectifier?

Description : What is a rectifier?

Last Answer : A rectifier is a device that allows current to pass through in one direction.

Why is there a small flow current during reverse bias?

Description : Why is there a small flow current during reverse bias?

Last Answer : In reverse bias there is a small flow of current due to minority charge carries electrons in p region and holes in n region.

Why does a reversed biased diode offer high resistance?

Description : Why does a reversed biased diode offer high resistance?

Last Answer : The charge carriers are repelled from the junction and no current flows through the junction. Thus the diode offers a high resistance.

Why does a forward biased diode offer low resistance?

Description : Why does a forward biased diode offer low resistance?

Last Answer : The external voltage over comes the junction potential and provides an easy path for the flow of charges across the junction. Hence it offers low resistance.

When is a p-n junction said to be forward biased or what is meant by forward biasing of p-n junction? How does it affect resistance?

Description : When is a p-n junction said to be forward biased or what is meant by forward biasing of p-n junction? How does it affect resistance?

Last Answer : When the positive terminal of a cell is connected to p-side and negative terminal to the n-side of a p-n junction then it is said to be forward biased. It offers low resistance.

What is bias voltage?

Description : What is bias voltage?

Last Answer : The external voltage applied to make p-n junction biased is called bias voltage.

When is a p-n junction said to be biased?

Description : When is a p-n junction said to be biased?

Last Answer : When an external source of e.m.f is connected to a p-n junction, it is said to be biased.

What is meant by depletion region?

Description : What is meant by depletion region?

Last Answer : The thin region around the junction containing immobile positive and negative charges is called depletion region.