123B_1_EE 123B W 11 lect 2 Chaps 1,2

# 123B_1_EE 123B W 11 lect 2 Chaps 1,2 - Chapter 1 Crystal...

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Chapter 1. Crystal Structure Lecture 2 January 6, 2011

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Quiz #1: 1. From periodic table, why is Ga, Al, In called “column III” atoms and P, As, Sb atoms called “column V”.
Periodic Table 3 5 valence e - 3 valence e - 8 e - is a complete shell •1 Ga atom bonds to 3 As atoms

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Crystal Growth – Epitaxy 4 GaAs Ga As Substrate MBE sample holder
2. We discussed epitaxy briefly and related the importance of lattice size to high quality crystal formation. Please list the following compounds in order of lattice constant:, AlAs, GaSb, GaP,GaAs.

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Planes in a Crystal (233) To describe this plane: Find intercept: 3a 1 , 2a 2 , 2a 3 or 3,2,2 Take reciprocal: 1/3, ½, ½ Represent as smallest integers: (2,3,3) Called ( h k l ) ≡ index of plane Second example Intercepts are: 4,1,2 (4,1,2) (1/4, 1, 1/2) (1, 4, 2) = (h k l) 2 1 2 1 1 2 3 â 1 â 2 â 3
Equilibrium crystal shape in nanopatterned epitaxy Faceting is determined by growth rate and mask. Low energy planes require more time to reach equilibruim. P. Wong, accepted JAP (2007) Pyramid A Pyramid B Pyramid C Pyramid A Pyramid B Pyramid C

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3. Draw the (111) crystal plane on an x, y, z axis.
Important Planes in a Cubic Crystal ) 200 ( ) 100 ( ) 00 1 ( ) 110 ( ) 111 ( How do these relate to (010), (200), (0Ī0) etc. ? Equivalent planes: (100) plane parallel to y, z planes

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Last Lecture: General overview and motivation periodic table atomic arrangement, bonding epitaxy

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