Band Theory: Metallic Bonding Photoelectron Spectroscopy.

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Presentation transcript:

Band Theory: Metallic Bonding Photoelectron Spectroscopy

Band Theory: Metallic Bonding Photoelectron Spectroscopy

Band Structure for Periods 4-6, Group 1A – 2B

Conduction in Solids

Silicon Semiconductors

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

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

np junction: diode npn junction: transistor

III-V Semiconductors: LED lights