Briefly
n -semoconductor has primary carrier -electrons
p - semoconductor has primary carrier -holes
"+" or "-" means that in this area much more primary carriers(or less if "-" ) then in area without "+" or "-" so we can changes resistivity of materials.
Diffusion - is process for creating p,p+,n,n+ etc areas. Good analogy - spreading aerosol in the room
Pwell- diffusion of p -semi in n-substrape (most common)
Nwell -diffusion of p -doping in n-substrape
i guess, bicave asked the role of these things, not the mean of these things.
I guess think like that: to make a contact you should make a p+ region (or n+, depends) in other case it would act like a Schottky junction (for example you don't conact the substrate directly)
i guess, bicave asked the role of these things, not the mean of these things.
I guess think like that: to make a contact you should make a p+ region (or n+, depends) in other case it would act like a Schottky junction (for example you don't conact the substrate directly)