Step 1: Understanding the Concept:
A P-N junction diode operates essentially as a one-way valve for electric current.
Biasing refers to the application of an external DC voltage to set the operating conditions. Forward bias occurs when the external voltage reduces the built-in potential barrier, allowing significant current to flow.
Step 2: Detailed Explanation:
To achieve forward bias, the applied voltage must counteract the internal depletion layer's electric field.
- The P-side (anode), which has holes (positive charge carriers) as majority carriers, is connected to the Positive terminal of the external voltage source.
- The N-side (cathode), which has electrons (negative charge carriers) as majority carriers, is connected to the Negative terminal.
This arrangement repels holes and electrons towards the junction, shrinking the depletion region width and enabling conduction.
Step 3: Final Answer:
During forward biasing, the P-side is connected to the positive terminal.