I Does the electron generated by the donor have no role?

[A Sofyan]

Why is the number of doping unrelated to the amount of current produced by solar cells? Suppose GaAs and Ge with the same amount of doping. Where is the role of an electron generated by the donor?

 

[scottdave]

Are you asking about n-type doping in general, or how it pertains to solar cells? You may find some of the information you want, by reading through this thread.
https://www.physicsforums.com/threa...urrent-from-pn-junctions.920384/#post-5805549