1. Silicon Computer Chips Review Band Theory Expand to Conductors/ Semiconductors/ Insulators Intrinsic vs. Doped Semiconductors n-type and p-type Semiconductors np Junctions and Circuit Elements Chip Fabrication

2. Review of Band Theory

3. Conduction in Solids

4. Intrinsic Semiconductors

5. Doped n-type and p-type Semiconductors

6. Junctions Diode Transistor

7. Chip Fabrication 1.Make really, really pure Si 2.Add impurities in a controlled way SiO 2 (s) + 4 HCl  SiCl 4 (l) + H 2 O(l) SiCl 4 purified by distillation. SiCl 4 + 2 Zn  Si + ZnCl 2 Si now 99.9% pure. Zone refining used to purify to 99.99999% pure.

8. Doping 1.Apply coating 2.Illuminate through mask 3.Dissolve illuminated areas 4.Add gas phase dopant 5.Repeat