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This Tutorial notes semiconductors and PN Junction diode mainly consists of Definitions of Matter - Atom - Element - Molecule - CompoundAtomic Structure and Neil Bohr's Atomic TheoryEnergy Band/Energy Level for Conductors, Insulators and SemiconductorsProperties of semiconductorclassification of SemiconductorsIntrinsic Semiconductor and Extrinsic Semiconductor N-type Semiconductor and P-type Semiconductor Effect of Temperature on SemiconductorsPN Junction Diode and its FormationDiode Biasing: Forward Biased Condition and Reverse Biased ConditionV-I Characteristics of DiodePN Junction Diode Equation5 Effect of Temperature on Diode CurrentRatings/Specifications of a DiodeIdeal and Real view of a DiodeApplications of PN Junction Diode: Diode as a Switch and Diode as Half Wave RectifierZener diodeV-I Characteristics of Zener DiodeAvalanche breakdown and Zener breakdownApplications of Zener diode: Zener Diode as a Voltage Regulator