What is the main difference between alloy junction transistor and grown junction transistor?

Yes, the are different names for the same thing.

bipolar transistors drive current vertically as opposed to fets which go horizontally. because the dies are flat bipolar has a much larger current flow area. Think of the bipolar as a wedding cake...

A power transistor is physically larger, and capable of carrying more current without melting or burning up. Usually a power transistor has a heatsink attached to help remove heat from the device and...

Bipolar transistors are so named because in which holes & electrones takes part in conduction.as opposed to unipolar transistors, such as field-effect transistors, in which only one type of...

The junction temperature is limited by the relationship between temperature and life, and the characteristics of the materials composing the transistor. Furthermore, transistors use minority carriers...