When the positive terminal of a cell or battery is connected to the p-side of the junction and the negative terminal to the n side, the diode is said to be forward biassed.
The depletion region narrows when the diode is forward biassed, lowering the potential barrier. As a result, the bulk of charge carriers in each region cross over into the other. The electrons flow from the n-side to the p-side, eventually arriving at the battery’s positive terminal. The electrons pumped into the n-region from the negative terminal of the battery combine with the holes that move from the p-side to the n-side. When forward-biased, the diode behaves in this manne