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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