semiconductor
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1
Ge Eg?
0.67 eV
2
Si Eg?
1.1 eV
3
GaAs Eg?
1.43 eV
4
when valence electron of atom transfer to another
Ionic Bonding
5
form bet. group of positive ions and a sea of electrons that are free to move; release of valence electron
metallic bind
6
bind that share electron w/ other atom
covalent bond
7
free from impurities
intrinsic semiconductor
8
w/ impurities to change electrical property
extrinsic semiconductor
9
Donor: _ Acceptor:_
N type (free electron) ; P type (holes)
10
extrinsic formed by adding donor impurities of 5 valence electron called pentavalent atoms.
N type
11
Pentavalent atoms
Antimony, phosphorus, arsenic, bismuth
12
extrinsic formed by adding acceptor of 3 valence electron (trivalent atom)
P type semiconductor
13
trivalent atom
gallium, aluminum, boron, indium
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