Charge supply by a Forward-biased PN Junction

In the following applet, use the scroll bar to set a positive bias voltage (Forward bias), say 0.2 Volts. Now, suppose that you are sitting inside the p-type Semiconductor (red rectangle in the top diagram). As you look at the junction, what kind of carriers are moving into the p-type region ? Answer: lots of electrons and a small amount of holes.

What you see in this applet is the log of the number of carriers moving. So, even though the applet shows a small difference in the numbers of carriers, it is actually a big difference. Not worrying about the carriers leaving the p-region, and worrying only about those moving in, we conclude the following: To the p-side, a forward-biased junction sends in lots of electrons (minority carrier), and leaking in a small amount of holes. The small amount holes are the thermally generated minority holes within a diffusion-length distance from the junction. A very small number indeed. negligible.

A forward-biased PN Junction supplies a large amount of minority carrier charge into the semiconductor (injection), and supplies a very small amount of majority charge (leakage).