Question

why we called it metal oxide semiconductor but we used polysislicon

Answer 1

Answer:

The phrase "metal–oxide–semiconductor" is a reference to the physical structure of MOS field-effect transistors, having a metal gate electrode placed on top of an oxide insulator, which in turn is on top of a semiconductor material. Aluminium was once used but now the material is polysilicon.

hope it will help

Answer 2

Answer:

The phrase "metal–oxide–semiconductor" is a reference to the physical structure of MOS field-effect transistors, having a metal gate electrode placed on top of an oxide insulator, which in turn is on top of a semiconductor material. Aluminium was once used but now the material is polysilicon. Other metal gates have made a comeback with the advent of high-κdielectric materials in the CMOS process, as announced by IBM and Intel for the 45 nanometernode and smaller sizes.

Explanation:

Plz give me a thanks.