# Energy-band diagram of forward-biased pn junction

When a p-n junction is forward biased then its energy-band diagram looks like this:

What would happen if $V_a>V_{bi}$? ($V_{bi}$ is the built-in potential and $V_a$ is the externally applied voltage). Apparently, the bands would "reverse", in the sense that the conduction band limit in the p-side will be lower that the conduction band limite in the n-side; the same would happen with the valence band.

What's the meaning of this? Can this happen?