Physics for Electrical Engineering: Unit III: Semiconductors and Transport Physics
Carrier Transport in Semiconductor mobility
In absence of an electrical field, the free electrons (electron gas) move in all directions in a random manner. They collide with other free electrons and positive ion core during the motion.
CARRIER TRANSPORT IN SEMICONDUCTOR MOBILITY
In
absence of an electrical field, the free electrons (electron gas) move in all
directions in a random manner. They collide with other free electrons and
positive ion core during the motion. This collision is known as elastic
collision (Fig 3.12).
As
the motion is random, the resultant velocity in any particular direction is
zero.
When
an electrical field is applied in a semiconducting material, the free charge
carriers such as free electrons and holes attain drift velocity Vd
The
drift velocity attained by the carriers is proportional to the electrical field
strength E.
i.e.,
Vd ∝ E
Vd
= µE ...(1)
where
μ is a proportionality constant and it is known as the mobility of the charge
carrier.refre
This velocity Vd, is different for different semiconductors and for different types of charge carriers.
Physics for Electrical Engineering: Unit III: Semiconductors and Transport Physics : Tag: : - Carrier Transport in Semiconductor mobility
Related Topics
Related Subjects
Physics for Electrical Engineering
PH3202 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation