N-type and P-type Semiconductors Class 12 Notes | EduRev

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Class 12 : N-type and P-type Semiconductors Class 12 Notes | EduRev

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N-type and P-type Semiconductors

d) Difference between N-type and P-type semiconductors

 

S.No.

N-type semiconductors

P-type semiconductors

1.

In these the impurity of some pentavalent element like P, As, Sb, Bi, etc. is mixed

In these, the impurity of some trivalent element like b, Al, In, Ga etc. is mixed

2.

N-type and P-type Semiconductors Class 12 Notes | EduRev

3.

in these the impurity atom donates one electrons, hence these are known as donor type semiconductors

In these, the impurity atom can accept one electron, hence these are known as acceptor type semiconductors.

4.

In these the electrons are majority current carriers and holes are minority current carriers, (i.e. the electron density is more than hole density n>> np)

In these the holes are majority current carriers and electrons are minority current carriers i.e. np >> nn

5.

In these there is majority of negative particles (electrons) and hence are known as N-type semiconductors

N-type and P-type Semiconductors Class 12 Notes | EduRev

In these there is majority of positive particles (cotters) and hence are known as P-type semiconductors.

N-type and P-type Semiconductors Class 12 Notes | EduRev

6.

in these the donor energy level is close to the conduction band and far away from valence band.

In these the acceptor energy level is close to the valence band and far away from conduction band.


(e) Conductivity formulae:

(a)  N-type and P-type Semiconductors Class 12 Notes | EduRev
(b)  N-type and P-type Semiconductors Class 12 Notes | EduRev
(c)  N-type and P-type Semiconductors Class 12 Notes | EduRev
(d)  N-type and P-type Semiconductors Class 12 Notes | EduRev

(f) Resistivity formulae:

(a)  N-type and P-type Semiconductors Class 12 Notes | EduRev
(b)  N-type and P-type Semiconductors Class 12 Notes | EduRev
(c) N-type and P-type Semiconductors Class 12 Notes | EduRev
(d)  N-type and P-type Semiconductors Class 12 Notes | EduRev
(e)  N-type and P-type Semiconductors Class 12 Notes | EduRev
(f)  N-type and P-type Semiconductors Class 12 Notes | EduRev

(vii) Characterizes Si and Ge at 300 K

 

Characteristics

Ge

Si

Energy gap

0.7 (eV)

1.1 (eV)

Electron mobility (μn)

0.39 (M2V-1S-1)

0.135 (M2V-1S-1)

Cotter mobility (μp)

0.19 (M2V-1S-1)

0.048 (M2V-1S-1)

Intrinsic current concentration

ni = 2.4 x 1019 cm-3

ni = 1.5 x 1016 cm-3

Resistivity

0.46 Ω-m

2300 Ω-m

Potential barrier

0.3 V

0.7 V

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