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Chapter 3, Current in Homogeneous Semiconductors • Carrier Motion • Current Flow – Drift – Diffusion • Recombination/Generation • Continuity Equations • Use of Continuity Equations •Notation Reminder •no, po: equilibrium •n, p: general carrier concentrations Reference: Pierret, Section 5.2 Electrons removed. Holes removed. 3 Electrons added to condution band. Holes added to valence band. From nT/NT no Note: R corresponds to generation here!! Reference: Pierret, Section 5.3. Equilibrium Excess carriers Gop is from light shining on the semiconductor Normal recombination. Depend on details of situation. For normal, low-level injection, p<<ND For direct bandgap semiconductors, R=βnp for direct band to band recombination. Minority carrier diffusion length for holes.