Working of Photovoltaic Device (Solar Cell)

[NewtonApple]

In the following http://electrons.wikidot.com/solar-cells
it mentioned that

The electron drifts and reaches the neutral n+-side whereupon it makes this region negative by an amount of charge -e.

how and when n-side becomes positive?

 

[Greg Bernhardt]

I'm sorry you are not generating any responses at the moment. Is there any additional information you can share with us? Any new findings?