which layer has highest resistance and why?

[ms_90]

among n+, p+, n well and poly which layer is having highest resistance and why?

is the resistance of diffusion/well increases as doping increases?

 

[badash199]

Resistivity is inversely proportional to the doping. So the highest resistance is obtained with the less doped well or diffusion.

See this chart: https://inside.mines.edu/~sagarwal/phgn435/images/resistivity.jpg

 

[erikl]

among n+, p+, n well and poly which layer is having highest resistance and why?

n-well has the highest resistance, then poly with salicide blocking, then n+, p+, then salicided poly (lowest, apart from metal layers).

is the resistance of diffusion/well increases as doping increases?

Other way round: resistance decreases with increasing doping: More doping atoms, more charge carriers free to move -> less electrical resistance.