00:01
So, transistor is composed of thin layers of semiconductor material either made of silicon or germanium, or nowadays it can be made from any other compound which acts as semiconductor.
00:12
And in transistor particularly, there are three layers of semiconductor, which is called emitter, base and collector.
00:22
So it can be either npn or pn transistor as you can see here and here.
00:27
N means that it is doped with phosphorus or arsenic.
00:36
So it's a mixture of silicon plus phosphorus or silicon plus arsenic.
00:41
And p means that it can be a mixture of silicon plus boron.
00:49
And there can be other dopings as well.
00:51
So this is the primary example of that.
00:55
So this is transistor for you...