Lets Know about Pn Junction
PN Junction
It is possible to manufacture a single piece of a semiconductor
material half of which is doped by P-type impurity and the other half
by N-type impurity ,The plane dividing the
two zones is called junction. Theoretically, junction plane is assumed
to lie where the density of donors and acceptors is equal. The P-N
junction is fundamental to the operation of diodes, transistors and
other solid-state devices.
Let us see if anything unusual happens at the junction. It is found
that following three phenomena take place :
1. A thin depletion layer or region (also called space-charge
region or transition region) is established on both sides of the junction and is so called
because it is depleted of free charge carriers. Its thickness is about 10−6m.
2. A barrier potential or junction potential is developed across the junction.
3. The presence of depletion layer gives rise to junction and diffusion capacitances
PN Junction
It is possible to manufacture a single piece of a semiconductor
material half of which is doped by P-type impurity and the other half
by N-type impurity ,The plane dividing the
two zones is called junction. Theoretically, junction plane is assumed
to lie where the density of donors and acceptors is equal. The P-N
junction is fundamental to the operation of diodes, transistors and
other solid-state devices.
Let us see if anything unusual happens at the junction. It is found
that following three phenomena take place :
1. A thin depletion layer or region (also called space-charge
region or transition region) is established on both sides of the junction and is so called
because it is depleted of free charge carriers. Its thickness is about 10−6m.
2. A barrier potential or junction potential is developed across the junction.
3. The presence of depletion layer gives rise to junction and diffusion capacitances
0 comments: