Energy Band Gap of P.N Junction Diode Instruments Comprises of DC regulated power supply 0-30V/150 mA, two round meters for voltage & current measurement, one PN junction diode (GE type0 is kept in oven, connections of supplies, meters & diode brought out at 4mm sockets, also provided with oven temperature control knob.The energy band gap of a P-N junction diode is a fundamental characteristic that plays a crucial role in its operation and functionality. Understanding the concept of the energy band gap helps shed light on the behavior of electrons and holes within the diode, allowing for the efficient flow of current in one direction while inhibiting it in the opposite direction.