1 electron = 1 photon?

Started Apr 12, 2013 | Discussions thread
Jack Hogan
Veteran MemberPosts: 4,023
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Re: 1 electron = 1 photon?
In reply to alanr0, Apr 12, 2013

alanr0 wrote:

The response is shown in A/W.  For each electron released, the charge is constant, but the photon energy is proportional to the photon frequency, and inversely proportional to the wavelength.

Efficiency in A/W = (electron charge x wavelength)/(planck's const x velocity of light)

At 100% quantum efficiency (1 electron per photon), you get 0.645 A/W at 800 nm, but only 0.323 A/W at 400 nm.  Your graph shows the quantum efficiency falling from around 84% at 600-800 nm, to around 53% at 400 nm.

In other words, less than 100% QE, with peak performance at 600-800 nm.

HTH

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Alan Robinson

Very helpful as always, Alan, I assume this holds on average.   Can there ever be a case where a single particularly energetic photon results in two electrons being produced by the photodiode?

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