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2015-03-01T13:31:00+05:30
 A p-n junction consists of two semiconductor regions with opposite doping type as shown in Figure 4.2.1. The region on the left is p-type with an acceptor density Na, while the region on the right is n-type with a donor density Nd. The dopants are assumed to be shallow, so that the electron (hole) density in the n-type (p-type) region is approximately equal to the donor (acceptor) density.
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Figure 4.2.1 ????
i think this is important
2015-03-01T21:05:45+05:30
the device formed by joining atomically a wafer of P- type semiconductor to the N - type semiconductor is known as P - N junction.

there are three process of making junctions,
diffusion
alloying
growth

diffusion - the impurity concentration is maximum at surface and decreases gradually inside the semiconductor

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