The resistivity of pure germanium at a particular temperature is `0.52Omegam`. If the material is doped with `10^(20)` atoms `m^(-3)` of a trivalent impurity material, determine the new resistivity. The electron and hole mobilities are givenn to be `0.2` and `0.4 m^(2)V^(-1)s^(-1)` respectively.
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The rate of effusion of a particular gas whas measured to be 40ml/min. Under same condition the rate of effusion of pure methane was 20ml/min. Then fi
`(r_(CH_(4)))/(r_(gas))=sqrt((M_(gas))/(16))=(20)/(40)=(1)/(2)` `M_(gas)=4gm`
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Limited Liability Partnership
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(a) What change occurs when AgCl is doped with `CdCl_(2)` ? (b) What type of semiconductor is produced when silicon is doped with boron?
(a) `CdCl_(2)` on adding to AgCl introduces impurity defect. The addition of one `Cd^(2+)` ion will replace two `Ag^(+)` ions to maintain electrical conductivity. One of the position of `Ag^(+)`...
2 Answers 1 views
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Correct Answer - `1.87 Omega^(-1)m^(-1)`
2 Answers 1 views
A doped semiconductor has impurity levels `30meV` below the conduction band. Is the material `n`-type or `p`- type? Find the maximum wavelength of igh
Correct Answer - `4.125xx10^(-5)m`
2 Answers 4 views
The number density of electrons and holes in intrinsic silicon at a given temperature is `4.94xx10^(10)cm^(-3)`. Calculate the resistivity and conduct
Correct Answer - `9xx10^(4)Omegacm, 11.1xx10^(-6)Scm^(-1)`
2 Answers 1 views
Determine the number density of donor atoms which have to be added to an intrinsic germanium to produce an `n`-type semiconductor of conductity `0.06S
Correct Answer - `96x10^(16)m^(-3)`
2 Answers 1 views
Germanium is doped one part million with indium at room temperature. Calculate the conductivity of doped germanium. Given: concentration of Ge atoms `
Correct Answer - `1.34xx10^(3)ohm^(-1)m^(-1)`
2 Answers 2 views
Determine the conductivity and resistivity of pure germanium at `300K` assuming that at this temperature the concentration of germanium is `2.5xx10^(1
Correct Answer - `2.12Sm^(-1),0.472Omegam`
2 Answers 2 views
A sample of germanium is doped to the extent of `10^(14)` donor atoms per `cm^(3)` and `7xx10^(13)` acceptor atoms per `cm^(3)`. The resistivity of pu
Correct Answer - `52.3mAcm^(-2)`
2 Answers 5 views