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Unformatted text preview: 5. Which picture above best illustrates the band structure for an n-type semiconductor? 6. Which picture above best illustrates the band structure for an insulator? 7. If you had a semiconductor made of Al and P, what would you substitute for the P to decrease the band gap? 8. To promote electrons from the valence band to the conduction band, what voltage (in V) must be applied to a 2.35 cm thick sample of the semiconductor with the band gap of 2315 kJ/mol? 9. What wavelength of light will be sufficient to move electrons across the band gap in ZnS? Is this visible light? GIVEN: E g for ZnS = 2.34 eV. 10. What temperature in degrees K must you raise ZnS to in order to move electrons across the gap thermally? 11. Indium arsenide, InAs, has a band gap energy of 0.35 eV. To make a compound semiconductor with a larger band gap you could substitute which element for As ? (a) In (b) P (c) Sb (d) Zn 12....
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This note was uploaded on 06/15/2010 for the course CHEM 124 taught by Professor Hascall during the Winter '08 term at Cal Poly.
- Winter '08