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Unformatted text preview: Semiconductors – σ = n i q(mu n + mu p ) – only for intrinsic semiconductors extrinsic – column V n-type column III p-type σ = nqu Diffusion to permeate dopants Ficks second law to find n Assuming complete ionization Stress and strain Stress - σ = F/A o strain - Σ = l – l o /l o = dl/l o F vs dl looks like stress – strain Slope = modulus of elasticity = stress/strain = σ/ Σ GPa = 10 3 MPa Specific strength – UTMS/density Fracture toughness – K IC = Y σsqrt(pi*a) Surface crack is 1a Diffusion Error function problem D = D o e-Q/RT NO LEVER LAW Phase change question Phase diagrams...
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- Spring '07
- Materials Science, Extrinsic semiconductor, unit cell CN, conductors thermal vibrations