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GDB Topic & date Dated: Jan 30, 14

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Graded MDB will be opened on 6th Feb 2014 at 12:00am. This discussion board will be closed on 7th Feb 2014 at 11:59pm.GDB will remain open for 48 hours. It is important for every student to take part in this discussion board. Your comments will be graded, which is worth 5% of your total marks.

The topic is:

“Tell the type of materials in which we can make control over charge carriers. Describe the current types in such materials and their respective directions”.

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solution :

Charge Carriers in Semiconductors

Charge Carriers in Semiconductors
Current is the rate at which charge ows.
In a semiconductor, two types of charge carrier, the electron and the hole, can contribute to a current.
Since the current in a semiconductor is determined largely by the number of electrons in the conduction band
and the number of holes in the valence band, an important characteristic of the semiconductor is the
density
of these charge carriers.
1.1 Equilibrium Distribution of Electrons and Holes
Equilibrium Distribution of Electrons and Holes
The distribution (with respect to energy) of electrons in the conduction band is given by the density of allowed
quantum states times the probability that a state is occupied by an electron.
This statement is written in equation form as
n(E) =gc(E)fF(E) ..........................(1)
where
gc(E)
is the density of quantum states in the conduction band and
fF(E)
is the Fermi-Dirac probability
function. The total electron concentration per unit volume in the conduction band is found by integrating
Equation (1) over the entire conduction-band energy. The distribution (with respect to energy) of holes in the
valence band is the density of allowed quantum states in the valence band multiplied by the probability that a
state is not occupied by an electron:
p(E) =gv(E) [1fF(E)]...............(2)
The total hole concentration per unit volume is found by integrating this function over the entire valence-band
energy. To nd the thermal-equilibrium electron and hole concentrations, we need to determine the position
of the Fermi energy
EF
, with respect to the bottom of the conduction-band energy
Ec
and the top of the
valence-band energy
Ev
plz do correct me if me wrong

comprehensive answer:

Semiconductors used to control charge carriers (hole and electrons).

after doping of pentavalent and trivalent impurities in pure semi conductor we get N-type and P-type material respectively. Electrons are majority carriers in N-type and holes are in P-type. Elctron diffuse from N to P side and hole from P to N side. both add and form diffusion current.

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