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P-Type - a semiconductor material that has been doped so that there is a much larger number of mobile holes than there are mobile electrons
EXAMPLES ARE BORON ALUMINIUM GALLIUM INDIUM THALLIUM
N-type - a semiconductor with more free electrons than free holes
a N type semiconductor is a pure semiconductor that is doped with pentavalent atoms... i.e. atoms with 5 electrons on the outermost shell..
a N type semiconductor is a pure semiconductor that is doped with trivalent atoms... i.e. atoms with 3 electrons on the outermost shell..
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a PN junction is formed when a N type semiconductor and a P type semiconductor are placed adjacent to each other... what happens is that the free electrons at the N type semiconductor moves towards the holes in the P type semicondutor. this results to holes and electrons gathering at the junction forming the depletion region...
basically pure silicon is not an insulator with very high resisitivity.its called intinsic semiconductor.we deliberately add some impurities to change its to mere few kilo ohms to miliohms depending upon doping
if we add phosporus then its called n type as phosporus is pentavalent atom there 1 electron of phosporus doesnt take part in bonding process .hence it can be excited to conduction band with very little energy rather at room temp all such free elc trons are excoted to conduction band .
same applies for p type materials when we use boron.as one space for elctron(hole) is free
dear freind
actually P and N type materilas we call it so because of majority and minority carriers that is in case of P type holes are majority carriers and as in case of N type electrons are majority carriers
Again this concept can be used in case of PN Junction as well as MOS devices
P-type Semicondutors:
P-type materials /semiconductors have a large no. of holes or we can say thay p-type materials have holes as majority carriers and electrons as minority carriers.
How p-type Materials are formed-type materials are formed when Silicon(Si) is doped with an element from 3rd group of the periodic table (such as boron(B), Aluminium(Al) or Gallium(Ga)) . Si has 4 electrons in itrs outermost shell and Al has 3 electrons in its outermost shell and when these both elements are doped the resulting into a bond having 7 electrons so there is defeciency of one electrons.
N-type Semiconductors:
N-type semiconductors have a large no. of electrons or we can say that p-type materials have electrons as majority carriers.
How N-type Materials are formed: N-type materials are formed whenSi is doped with an element of 5th group of the peridic table such as Phosphorus(P) or Arsenic(As). when both materials are doped the resulting materials has covalent bons havng 9 electrons i.e 1 extra in each bond. So electrons become majority carriers
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