How can you make Ohmic contact with NiSi in semiconductors?

[wasong]

TL;DR Summary

How NiSi is ohmic contact?

How NiSi is ohmic contact?
Ohm contact occurs when a semiconductor has a lower work function than a metal, doesn't it? NiSi has a larger work function than Ni, so how do you make ohm contact?

 

[berkeman]

Can you post some links to the reading that you have been doing about this? Why do you want to use Ni in an Ohmic contact with a semiconductor? What is the application?

 

[Baluncore]

https://en.wikipedia.org/wiki/Nickel_silicide

 

[wasong]

Can you post some links to the reading that you have been doing about this? Why do you want to use Ni in an Ohmic contact with a semiconductor? What is the application?

I'm not trying to use nickel for Ohm contact. Nickel silicide is used for ohmic contact differently from nickel, so we just want to know what difference NiSi becomes ohmic contact differently from Ni.