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Lecture 1

Lecture 1 - EE105 Fall 2009 Lecture 1 Slide 1 Prof...

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Unformatted text preview: EE105 Fall 2009 Lecture 1, Slide 1 Prof. Salahuddin, UC Berkeley Lecture 1 OUTLINE • Semiconductor Basics – Semiconductor materials – Intrinsic (undoped) silicon – Doping – Carrier concentrations Reading: Chapter 2.1 EE105 Fall 2009 Lecture 1, Slide 2 Prof. Salahuddin, UC Berkeley What is a Semiconductor? • Low resistivity => “conductor” • High resistivity => “insulator” • Intermediate resistivity => “semiconductor” – conductivity lies between that of conductors and insulators – generally crystalline in structure for IC devices • In recent years, however, non-crystalline semiconductors have become commercially very important polycrystalline amorphous crystalline EE105 Fall 2009 Lecture 1, Slide 3 Prof. Salahuddin, UC Berkeley Semiconductor Materials Gallium (Ga) Phosphorus (P) EE105 Fall 2009 Lecture 1, Slide 4 Prof. Salahuddin, UC Berkeley Silicon • Atomic density: 5 x 10 22 atoms/cm 3 • Si has four valence electrons. Therefore, it can form covalent bonds with four of its nearest neighbors. • When temperature goes up, electrons can become free to move about the Si lattice. EE105 Fall 2009 Lecture 1, Slide 5 Prof. Salahuddin, UC Berkeley Carrier Concentrations in Intrinsic Si...
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Lecture 1 - EE105 Fall 2009 Lecture 1 Slide 1 Prof...

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