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ECE3080-L-9-Photogen-Therm Recomb Gener - minority lifetimes

ECE3080-L-9-Photogen-Therm Recomb Gener - minority...

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ECE 3080 - Dr. Alan Doolittle Georgia Tech Lecture 9 Photogeneration, Absorption, and Nonequilibrium Reading: (Cont’d) Notes and Anderson 2 sections 3.4-3.11
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ECE 3080 - Dr. Alan Doolittle Georgia Tech Photogeneration Light with photon energy, h ν < Eg is not easily absorbed. A convenient expression for the energy of light is E=1.24/ λ where λ is the wavelength of the light in um. Light with energy, h ν > Eg is absorbed with the “unabsorbed” light intensity as a function of depth into the semiconductor is I(x) = I o e - α x where Io is the initial light intensity, x is distance and α is the absorption coefficient [1/cm]. h ν < Eg h ν > Eg
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ECE 3080 - Dr. Alan Doolittle Georgia Tech Photogeneration
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