Lecture_2_semiconductor

Lecture_2_semiconductor - Homework: 1.8, 2.1, 2.3...

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Unformatted text preview: Homework: 1.8, 2.1, 2.3 Semiconductor? (1) Pure silicon is not conductive (2) doped silicon is conductive Pure Silicon is not conductive at all! 1. 4 electron Lecture 2: semiconductor Wednesday, August 31, 2011 Lect2_semi Page 1 Add As Add Boron Add Boron Add As Doping Wednesday, August 31, 2011 9:24 AM Lect2_semi Page 2 Electric current is calculated as the amount of charge in v meters that passes thru a cross-section if the charge travel with a velocity of v m/s. q n Area s C I ] nd meter/seco [ / cond coulomb/se C 10 6 . 1 19 q ne I J 2 meter Area Ampere The electrons are ONLY accelerated by the field during the flight between one scattering center and next. The relationship between drift velocity and electric is a a 2 1 mass effective electron the is m parameter; material a is : ; m e E Mobility u Drift current Wednesday, August 31, 2011 9:27 AM Lect2_semi Page 3 Example 1: A p-type silicon wafer resistivity is 3 ohm.cm, what is the doping concentration?...
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Lecture_2_semiconductor - Homework: 1.8, 2.1, 2.3...

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