Solar cell open-circuit voltage

[hokhani]

As far as I know, when the light is shining on the solar cell (PN junction), current would be stopped if voltage reaches to Voc (open-circuit voltage). Is Voc equal to the difference between fermi level of n-type and p-type parts?

 

[meBigGuy]

http://pveducation.org/pvcdrom/solar-cell-operation/open-circuit-voltage