I The Role of Doping and Electric Fields in P-N Junction Formation?

[Let'sthink]

In a P region although immobile negative ions are there the overall region is neutral as there are equal number of mobile positively charged holes. But when this P region is beside The N region the excess electrons present there come on the P side and neutralize holes and thus the unbalanced immobile Indium ions help in creating electric field along with the unbalanced positively charged Phosphorous ions. So in brief preferred electron hole recombination creates depletion region and immobile impurity ions on both side create the electric field in equilibrium. Now you ask your original question and you get the correct answer. On this you can superimpose the applied bias and see what happens to the current flow, depletion region and the electric field present in the depletion region.

I have corrected some typographical mistake in the copied portion above.