4 Continuum Sources Emit radiation over a broad spectral range. Continuum in Wavelength, not necessarily in time.Most of these are “black body emitters. The spectral range depends upon the temperature of the black body.
19 3. Si Photodiode Si: 3s23p2 Covalent Bonds in Solid Therefore 1/2–filledsp3ΔE ≤ 2.5 eV(semiconductor)4 electrons fill a valence band at 0KAt higher T an electron can move to conduction bandLeaving a positive hole behind (both are mobile)
20 3. Si Photodiode Doping Si with a group 5 element (As or Sb) results in extra electrons (n-type).Doping with a group 3element (In, Ga) resultsin extra holes (p-type)