---

---

• EDC requires basic knowledge of physics like electrons, holes, direction of current and development of potential difference. 

• Operation of semiconductors, doping, N-Type and P-Type semiconductor 

PN Junction Diode Construction and Working

• The PN Junction is a simplest two terminal electronic device. The PN junction has two terminals - Anode (+) and Cathode (-). This device allows current to flow in only one direction - positive to negative terminal.  The electrical representation is shown in the figure. The silver bar on the diode represents the cathode terminal.

​​​​​​​

Construction of PN Junction 

• The construction of PN junction deals with bringing the P-type and N-type semiconductor material together.The P-type material is obtained by doping the intrinsic semiconductor with trivalent impurity and N-type material is obtained by doping the intrinsic semiconductor with pentavalent impurity. The current flowing through the diode is due to the electrons. The electrons flow is always opposite to direction of current. 

---

---