Normally polysilicon has more resistance compared to metal. For shorter distance we go with polysilicon keeping fabrication process in mind .
Usage of metal for short distances need contacts which increases the resistance significantly.
Poly has got higher melting point and can withstand high temperature phases that follow Gate formation. So,Poly is preffered to metal, Although it has got high resistivity.
Post a Comment
Your comments will be moderated before it can appear here.