Types of Extrinsic Semiconductors

What do you mean by a semiconductor? Discuss how can you improve its conductivity on the basis of band theory.

In p-type semiconductor electrons are the majority carriers of current.

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Addition of trivalent impurity to germanium crystal converts it to an n-type semiconductor.

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Electrons are majority carriers in p-type semiconductor.

A semiconductor has equal electron and hole concentrations of  $6\times {10}^8 {\mathrm{m}}^{-3}$. On doping with certain impurities, electron concentration increases to $9 \mathrm{x} {10}^{12} {\mathrm{m}}^{-3}$. Calculate the hole concentration.

A semiconductor has equal electron and hole concentrations of  $6\times {10}^8 {\mathrm{m}}^{-3}$. On doping with certain impurity, electron concentration increases to $9 \mathrm{x} {10}^{12} {\mathrm{m}}^{-3}$. Identify the new obtained after doping.

Pure silicon at $300 \mathrm{K}$ has equal electron and hole concentration of $1.5\times {10}^{16} {\mathrm{m}}^{-3}$. Doping by indium increases the hole concentration to $4.5\times {10}^{22} {\mathrm{m}}^{-3}.$ Calculate the new electron concentration in the doped silicon.

In n$‐$type semiconductor _____ are the major carriers of current. 

A doped semiconductor has impurity levels $0.01 \mathrm{eV}$ above the valence band. Find maximum wavelength of light which can create a hole in the valence band. 

A doped semiconductor has  impurity levels $0.01 \mathrm{eV}$ above the valence band. Is it an n-type semiconductor or p-type?

Distinguish between n-type and p-type semiconductors.

In a semiconductor the concentration of electrons is $8\times {10}^{13} {\mathrm{cm}}^{-3}$ and that of the holes is $5\times {10}^{12} {\mathrm{cm}}^{-3}$. Is it a p-type or n-type semiconductor?

What type of extrinsic semiconductor is formed when silicon is doped with bismuth?

What type of extrinsic semiconductor is formed when germanium is doped with indium?

How does the energy gap in a semiconductor vary, when doped with a pentavalent impurity?

Majority charge carriers in extrinsic semiconductors are _____.

If silicon atom is doped with a donor impurity, then donor atoms should be _____.

When pure silicon is doped with trivalent impurity like boron, the conduction is due to _____.

An n-type semiconductor is ______.

Name the minority charge carriers in a p-type semiconductor?