Question

What causes a larger current through a
pn-junction diode when forward biased?​

Answer 1

$\huge\star\mathfrak\blue{{Answer:-}}$

When a pn-junction diode is forward biased, the depletion region narrows and consequently the potential barrier is reduced. Hence, the diode has a very low resistance. Therefore, the junction allows a high current to flow across it.

Answer 2

Answer:

If a diode is reverse-biased, the voltage at the cathode is comparatively higherthan at the anode. ... This increases the voltage barrier causing a high resistance to the flow of charge carriers, thus allowing minimal electriccurrent to cross the p–n junction.