Construction of MOSFET
A Metal oxide semiconductor field effect transistor (MOSFET) is also known as the IGFET i.e. insulated gate FET. The schematic constructional diagrams of both n-channel and p-channel MOSFETs are given below.
unipolar transistor
It is called unipolar transistor, because the current carried in it is due to only one type of charges either electrons or holes. They are of two types: N-channel and P-channel.
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Junction Field Effect Transistor (JFET)
The Junction Field Effect Transistor consists of one long n-channel with two p-layers inserted at the sides. The n-channel forms the conducting path for the charges.
Introduction to Bipolar & Unipolar Transistors
Bipolar and unipolar transistors can be categorized according to their basic functionality. In bipolar transistor the electric current flows due to BOTH electrons and holes through it. However, in unipolar transistor the current flows EITHER due to electrons OR holes through it.