Semiconductors are at the heart of electronics devices and things like mobiles which we use today. It's a tough topic to understand but we have made it as simple as possible, with creative animations, 3D models and images.
Following topics are covered:
1) Why is it called 'semi' conductor?
2) gadgets having semiconductors
3) About Conductivity
4) Energy Bands in solids: Conduction band and Valence band
5) About Semiconductors: holes and electron movements
6) p-n junction
> Diffusion current
> Biasing a p-n junction : Forward and Reverse Bias
7) p-n junction Diode
8) p-n junction as a Rectifier
9) Transistors - comparing with the older Triodes
10) Transistors: a sandwitch of P-N-P and N-P-N
> N-P-N transistor: how it works
> Symbol and circuit diagram
11) P-N-P Transistor
> Symbol and circuit diagram
12) Transistor Symbols: Emitter and Colelctor positions - the easy way - for NPN and PNP
13) Biasing of Transistors, and Thermal runaway
> Beta dependent and beta-independent types of biasing
14) Solved problems