Silicon Computer Chips

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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
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Review of Band Theory
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Conduction in Solids
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Intrinsic Semiconductors
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Doped n-type and p-type Semiconductors
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Junctions
Diode Transistor
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Chip Fabrication

1. Make really, really pure Si
2. Add impurities in a controlled way

SiO2(s) 4 HCl ? SiCl4 (l) H2O(l)
SiCl4 purified by distillation. SiCl4 2
Zn ? Si ZnCl2 Si now 99.9 pure. Zone
refining used to purify to 99.99999 pure.
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Doping

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

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