Photodiodes Ingle and Crouch, Ingle and Crouch, Spectrochemical Analysis Spectrochemical Analysis Photons incident on Photons incident on the depletion layer the depletion layer induce a current. induce a current. In most cases, best In most cases, best response in the NIR. response in the NIR. Response is linear Response is linear over 6 – 7 orders of over 6 – 7 orders of incident radiant incident radiant power power
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Photodiodes Ingle and Crouch, Spectrochemical Analysis Photons incident on the depletion layer induce a current. In most cases, best response in the NIR.
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Photodiodes
Ingle and Crouch, Ingle and Crouch, Spectrochemical AnalysisSpectrochemical Analysis
Photons incident on the Photons incident on the depletion layer induce a depletion layer induce a current.current.
In most cases, best In most cases, best response in the NIR.response in the NIR.
Response is linear over 6 – Response is linear over 6 – 7 orders of incident radiant 7 orders of incident radiant powerpower
Spectral Response of Photodiodes
Shinya Inoue and Kenneth Spring, Shinya Inoue and Kenneth Spring, Video MicroscopyVideo Microscopy, Plenum Press, New York, 1997., Plenum Press, New York, 1997.
Douglas A. Skoog and James J. Leary, Principles of Instrumental Analysis, Douglas A. Skoog and James J. Leary, Principles of Instrumental Analysis, Saunders College Publishing, Fort Worth, 1992.Saunders College Publishing, Fort Worth, 1992.
Simultaneous Simultaneous detection in detection in a spectrophotometer.a spectrophotometer.
Incident photons excite electron-hole pairs,electrons gather in potential wells in each pixel
-V-V +V
N-type silica is doped with pentavalent species = excess electrons
P-type is doped with trivalent species = excess holes
CCD Rain Bucket AnalogyCCD Rain Bucket Analogy
Shinya Inoue and Kenneth Spring, Shinya Inoue and Kenneth Spring, Video MicroscopyVideo Microscopy, Plenum Press, New York, 1997., Plenum Press, New York, 1997.