Dear Amit Das ,

There is a general formulation for the contact difference of potential between two any two semiconductors or even two materials. Such junctions are called heterojunctions.

The contact difference of potential phi= The work function difference of the two contacted materials. Assume that the work function of the two materials are phi1 and phi2, then phi= Ph1-ph1

The work function of a material is the difference between the vacuum level and the Fermi-level= Ev-Ef

For an application of this principle please follow the paper in the link:Article M. Abdelnaby, A. Zekry, F. Elakkad and H. F. Ragaie, “ Depen...

and the paper:Conference Paper Generic Analytical Models for Organic and Perovskite Solar Cells

Best wishes

Have a look at:

- Kanbe, Hiroshi, Masayuki Miyaji, and Tatsuya Ito. "Ge/Si heterojunction photodiodes fabricated by low temperature wafer bonding." Applied physics express 1.7 (2008): 072301. (https://opg.optica.org/oe/fulltext.cfm?uri=oe-21-14-17309)

Thank you, everyone.