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lec_2.3

# lec_2.3 - 2.3 Carrier Transport 2.3.1 Carrier Drift Drift...

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ECE3080, Chapter 2.3 1 May 25, 2005 ECE 3080: Chapter 2.3 – Device Fundamentals O. Brand, 1 of 16 2.3 Carrier Transport 2.3.1 Carrier Drift Drift Current Mobility Resistivity Band Structure under Applied Field 2.3.2 Carrier Diffusion Diffusion Current 2.3.3 Total Current Equations Pierret, Chapter 3.1-3.2, page 75-104 May 25, 2005 ECE 3080: Chapter 2.3 – Device Fundamentals O. Brand, 2 of 16 2.3.1 Carrier Drift I Drift = Charged particle motion in response to an applied electric field Macroscopic Definition: Carriers of a given type (electrons or holes) move along at a constant velocity, the drift velocity, parallel or antiparallel to the applied electric field Drift Current Densities [A/cm 2 ]: ! J p,drift = q p ! v d,p ! J n,drift = ! q n ! v d,n

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ECE3080, Chapter 2.3 2 May 25, 2005 ECE 3080: Chapter 2.3 – Device Fundamentals O. Brand, 3 of 16 Carrier Drift II For small electric fields, the drift velocity is proportional to the applied electric field with the mobility µ as proportionality factor: The mobility is the central parameter characterizing the carrier drift, resulting in the following current densities: v d,p = μ p !
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