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1. Find Debye length in p-type Ge at 300 K if Na = 1014 cm-3. Assume that all acceptors are ionized, o = 16.
2. Calculate the bipolar diffusion coefficient of intrinsic (un doped) Ge at 300 K.
µn/µp = 2.1, µn = 3900 cm2 V-1s-1.
3. Holes are injected into n-type Ge so that at the sample surface ?p0 = 1014 cm-3.
Calculate ?p at the distance of 4 mm from the surface if τp = 10-3 s and Dp = 49 cm2/s.
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