Photodiode (AQA A-Level Physics): Flashcards
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What is a photodiode?
What is a photodiode?
A semiconductor diode that allows current to flow when exposed to light
Photodiode junction construction
Photodiode junction construction
Junction between p-type and n-type materials
What photons do in a photodiode
What photons do in a photodiode
Release charge carriers (electrons and holes)
Relationship: light intensity & current
Relationship: light intensity & current
Current is directly proportional to light intensity
Photoconductive mode bias type
Photoconductive mode bias type
Reverse-biased
Photovoltaic mode bias type
Photovoltaic mode bias type
Forward-biased
Dark current in photovoltaic mode
Dark current in photovoltaic mode
About 500 pA
Responsivity formula
Responsivity formula
Spectral response meaning
Spectral response meaning
Photodiode sensitivity to different wavelengths of light
Scintillator efficiency requirement
Scintillator efficiency requirement
Photodiode's spectral response should match the wavelength emitted by the scintillator