Electronic Devices - FET Devices - Discussion

A BJT is a bipolar device since it has holes and electrons as charge carriers in the PN junction, while for a FET it is either a hole for P-Channel or electron for an N-Channel that is why it is unipolar.

BJT does not use an electric field in its operation so it can't be Bipolar Junction Field Effect Transistor.

Anyway, BJT is bipolar because it employs two majority carrier in its output current because input current always passes on the base. Whereas on FET, it's construction only employs one majority carrier on the output because the input current only passes through the channel (source-to-drain) and will never pass through the Gate.

BJT is bipolar junction field effect transistor.