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...