1. Discuss how a missing atom at a lattice side contributes to the conductivity of a semiconductorÂ Â Â Â Â 2....

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Physics

1. Discuss how a missing atom at a lattice sidecontributes to the conductivity of asemiconductorÂ Â Â Â Â
2. Estimate the energy of a photon of X rays. (Answer:12 keV)
3. On the one hand, we say thatelectrons in atoms have discrete energies; on the other hand, wesay that there is inherent uncertainty in our ability to measureenergies. Is there a conflict here?
4. You have just calculated the number density ofp-carriers in undoped germanium, a semiconductor, at roomtemperature. Is it necessary to make a second calculation to findthe number density of free electrons?
5. Estimate the energy of a photon of visible light.(Answer: 2.4 eV)

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4.2 Ratings (799 Votes)

1 When a particle is missing at oneor more lattice sites we get a vacancy If thesevacancies are occupied by some other materials atom then theconductivities will change abruptly Semiconductors are verysensitive to impurities The conductivity of silicon or germaniumcan be increased by a factor of up to 106 by adding aslittle as 001 of an impurity The conductivity of a semiconductoris given by are themobilities of electron and holes q is the charge of the carriersp and n are the density of hole and electrons in semiconductor Adoped semiconductor majority carriers greatly outnumber minoritycarriers so that See Answer

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