Quiz 1 answer

Quiz 1 answer - AT75.09 Optoelectronic Material and Devices...

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AT75.09 Optoelectronic Material and Devices - J. Dutta 2005 QUIZ 1 (January 20, 2005) Ques 1: Quick quiz a. Name one elemental semiconductor and one compound semiconductor. Si, Ge are elemental semiconductors GaAs, GaSb, AlSb are compound semiconductors b. What is the difference between a crystalline and polycrystalline material? Polycrystalline – The material consists of many small crystalline portions (called “crystallites”), which may be oriented differently with respect to each other. In a true crystalline material, every part of the crystal is oriented exactly the same – its just one “single crystal” c. Give a word definition of the term “unit cell”. Unit cell – a small portion of any given crystal, repeating this cell results in a full crystal. Unit cells are not unique. You can have different unit cells, each giving the full crystal when repeated. d. How many atoms are in a unit cell of the simple cubic/bcc/fcc/diamond lattice ? SC = 1 : 1/8 from each corner atom, 8 corner atoms. Only 1/8 belongs to the unit cell. 7/8 belongs to others that share that atom.
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