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Photoelectron Spectroscopy. Band Theory: Metallic Bonding. Photoelectron Spectroscopy. Band Theory: Metallic Bonding. Band Structure for Periods 4-6, Group 1A – 2B. http://employees.oneonta.edu/viningwj/sims/metallic_bonding_band_theory_s.html. Conduction in Solids. Silicon Semiconductors.

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band structure for periods 4 6 group 1a 2b
Band Structure for Periods 4-6, Group 1A – 2B

http://employees.oneonta.edu/viningwj/sims/metallic_bonding_band_theory_s.html

slide8

Chip Fabrication

  • Make really, really pure Si
  • Add impurities in a controlled way (doping)

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.

slide9

Doping

  • Apply coating
  • Illuminate through mask
  • Dissolve illuminated areas
  • Add gas phase dopant
  • Repeat