2 Semiconductor - Solution

2 Semiconductor - Solution - and acceptor impurities. An. A...

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Tutorial (Semiconductor) Chapter 1 problems - 7, 8, 9, 10, 11 Tutorial (Semiconductor) - Solution 7. Describe the difference between n-type and p-type semiconductor materials. An. An n -type semiconductor material has an excess of electrons for conduction established by doping an intrinsic material with donor atoms having more valence electrons than needed to establish the covalent bonding. The majority carrier is the electron while the minority carrier is the hole. A p -type semiconductor material is formed by doping an intrinsic material with acceptor atoms having an insufficient number of electrons in the valence shell to complete the covalent bonding thereby creating a hole in the covalent structure. The majority carrier is the hole while the minority carrier is the electron. 8. Describe the difference between donor
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Unformatted text preview: and acceptor impurities. An. A donor atom has five electrons in its outermost valence shell while an acceptor atom has only 3 electrons in the valence shell. 9. Describe the difference between majority and minority carriers. An. Majority carriers are those carriers of a material that far exceed the number of any other carriers in the material. Minority carriers are those carriers of a material that are less in number than any other carrier of the material. 10. Sketch the atomic structure of silicon and insert an impurity of arsenic as demonstrated for silicon in Fig. 17. An. Same basic appearance as Fig. 1.7 since arsenic also has 5 valence electrons (pentavalent). 11. Repeat Problem 10, but insert an impurity of indium. An. Same basic appearance as Fig. 1.9 since boron also has 3 valence electrons (trivalent )....
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This note was uploaded on 01/11/2011 for the course EE 2106 taught by Professor Ytchow during the Spring '07 term at City University of Hong Kong.

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