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