Chapter 4 Lecture - Part 2

Concentration the total current density for each

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Unformatted text preview: ield and a Applicable concentration gradient. concentration – The total current density for each carrier will have The diffusion and drift components (Eq. 4-23) diffusion – The total current density is the sum of each carrier Drift and diffusion directions for electrons and holes in a carrier gradient and an electric field. Particle flow directions are indicated by dashed arrows, and the resulting currents are indicated by solid arrows. Diffusion of Carriers Diffusion • Implication: – Minority carriers can contribute significantly to total Minority diffusion current density diffusion – Why: • Drift components of current density are proportional to Drift the majority carrier concentration and minority carrier concentration is l...
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