- #36
cmos
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cabraham said:The "driver" is energy, not I or V. Now with the photodiode, I mentioned it to show that I, the photocurrent, is NOT driven by a voltage. You then proceed to lecture me on exactly what I originally said. Read my previous post. When you said that V drives I, I brought in the photodiode to demonstrate otherwise. Now you're telling me that I and V (and E as well) can be "de-coupled", the exact opposite of your original premise. Once again, what "drives" I in a photodiode is *energy* in the form of photons. In a pd, photons incident on the surface transfer energy to the lattice and electrons are elevated from valence to conduction. In an LED, the opposite takes place. The forward current is set up, and electrons dropping from conduction to valence incur an energy decrease. Energy is conserved in the way of photon emission. Once again, the driver is energy.
This is partly incorrect. First off, an electric potential difference (i.e. voltage) implies an energy difference (energy is directly proportional to electric potential). However, when one speak of currents, it is customary to speak of electric potentials as opposed to energies.
More importantly, your description of light incident on a photodiode is correct up to the point where photons elevate an electron into the conduction band. It is customary to say that you are creating excess minority carriers on either side of the junction. These minority carriers, however, are then swept to the opposite side of the junction by the built-in potential of the junction. So, as you see, it is still a voltage that drives the current.
Your mention of the LED seems to add nothing to the conversation and implies an effort to confuse and draw attention away from the topic at hand.
In reading these last few post, it seems as if you come up with complicated scenarios that are highly convoluted in their explanation. You then go on to mention "On the Electrodynamics of Moving Bodies." Great.
Can you come up with ONE example where current is the ultimate driver? Don't get cute, don't confound the problem. Just present one example where current is the ultimate driver.