Semiconductor Transport

Important Concepts

• Carrier Types: Electrons and Holes
• Drift Current: Carrier Movement due to External Field
• Diffusion Current: Carrier Movement due to a concentration gradient
• Movement of excess minority carriers

Lecture Notes

• Lecture #1 notes : Movement of carriers, Drift Current, and Diffusion Current
• Lecture #2 notes : Excess Carriers, Majority/Minority Carriers, Recombination Rates
• Lecture #3 notes : Calculation of carrier distributions and resulting carrier currents
• Lecture #4 notes : Important carrier distribution calculations
• Summary of important equations

Homework Questions

• Relationship of Bandgap and n_i
• Recommended Textbook Questions: 3.2, 3.13, 3.17, 3.22

Project Questions

• An Ideal Barrier Problem --- transport of electrons across an ideal voltage barrier
• Hole diffusion in n-type silicon
• Generation of Excess Hole Concentrations due to Light
• A CdS Photo-Resistor Problem

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