This first video provides an overview of the pn junction with an emphasis on the nature of the depletion region. It may help prepare you for the subsequent videos on forward biased junctions. You can skip it if you already understand this part.
Here are the second and third videos (accidentally split into two). These discuss the 6 regions that arise in a biased pn junction (normal p, recombination, depleted p, depleted n, recombination, normal n). Recombination and a minority carrier diffusion current occur together outside the depletion region in a "recombination region". For HW, calculate and discuss the length scale associated with the recombination region. Is larger or smaller than the length scale of the depletion region, \(x_d\)?
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