The Knowledge Vault

  Diode or P-N Junction Theory Explained Introduction A diode is a fundamental component in electronics, widely used for its unidirectional current-carrying property. At the core of its operation lies the P-N junction —a boundary or interface between p-type and n-type semiconductors. Understanding the theory of the P-N junction, including forward and reverse biasing, depletion regions, and V-I characteristics, is crucial for anyone learning electronics or semiconductor physics. This blog explains the theory behind the P-N junction and how diodes work under various conditions, with all the important parameters and equations included.  Table of Contents What is a Diode ? Formation of P-N Junction Depletion Layer Potential Barrier and Electric Field Forward and Reverse Biasing Forward Bias Reverse Bias V-I Characteristic of Diode Ideal vs Practical Diode Conclusion What is a Diode? A diode is a non-linear , active , and unidirectional device. It allows current to flow in one dir...