Solid State Devices
Solid State Devices ECE 3103
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This 7 page Class Notes was uploaded by Hulda Gaylord on Monday September 21, 2015. The Class Notes belongs to ECE 3103 at University of Virginia taught by John Bean in Fall. Since its upload, it has received 35 views. For similar materials see /class/209736/ece-3103-university-of-virginia in ELECTRICAL AND COMPUTER ENGINEERING at University of Virginia.
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Date Created: 09/21/15
quotA Place for Everything amp Everything in its Placequot Place semiconductor crystal Everything valence electrons Semiconductor crystal offers arrangement of atoms with precisely the right number of strong bonding sites for the atoms39 valence electrons Because all electrons have a comfortable quotplacequot they tend to be locked in position insulator If additional electron is added by inserting foreign atom with too many valence electrons that electron won39t quotfitquot well into structure and will tend to wander f electron is deleted by inserting foreign atom with too few valence electrons electron will be quotstolenquot from neighboring atom which will steal from its neighbor Can come up with lots of alternatives Here are some possible unit cellsquot basic block of atoms that is repeated to get crystal x K I s 1 1L1 1quotO I I r I 4 quot 1 quot z 17 1 ixI I I I y 3 M I I I I I 0 o f I a b 6 Cubic Body Centered CubIc Face Centered Cubicquot Or the ones that will be most important to us Zincblende Structure Howdo you describe directions and planes in a general lattices not j a silicon diamondlike lattice Natural to describe displacements in terms of basic unit cell spacings Lattice displacement 3a 2b Can similarly describe directions 1m 1111a1blc 1101a1bOc 1001a0b 0c 010 0a 1b 0c 001 0a0b 1c No effective difference between 100 010 and 001 in a cubic lattice 80 describe this family of directions as lt100gt note the triangular brackets How do you specify a plane quotie the surface of the crystal is a planequot 1 Specify plane by lattice vector it is perpendicular to plane perpendicular to 111 vector is a 111 plane plane perpendicular to 110 vector is a 110 plane Squiggly brackets Family of equivalent planes 100 010 001 100 family 2 Miller lndicies more general method i Determine where plane or plane intersects axes a intersect is 2 units b intersect is 2 units c intersect is infinity is to c axis ii Take reciprocals of intersects in order 12 12 1 infinity 12 12 0 iii Multiply by smallest number to make all integers 2 12 12 0 quot 1 1 0 planequot 1 inf inf 1 1 inf 100 110 integers 10 0 110