It appears that external capacitance on the diode has an appreciable effect by slowly decreasing the produced DC voltage. The decay rate is rather slow, on the order of weeks to months. Initially that is difficult to explain, but here is one good explanation -->
I just ran a Spice simulation on the internal noise across a small microscopic segment within the diode to see how external capacitance effects the net noise on the diode. To my surprise, external capacitance has an extremely small effect. Consider an LED that has only 1 Gohm resistance at near zero bias, Rz. We will analyze the noise across a small slice of that diode that is 1 Kohm, which would be 1 Kohm / 1 Gohm = 1 millionth of the diode. In this example, the diodes capacitance is 0.3 pF. When a 1.0 uF external capacitor is placed across the diode, the change in noise across the 1 Kohm slice is only 0.9999995 times less noise.
The above simulation is analyzing the diode noise by taking a small *axial* slice of the diode. Next, I divided that small axial slice into small diode segments *width-wise*. This provides noise analysis on a small area of the diode. The change in noise across the individual segment was that much more less, which results in 0.9999999999998 times less noise.
Next, is the final step. The noise analysis across a small segment of diode has been sliced axially and width-wise. Next, the final step is to segment the diode height-wise, which results in 0.9999999999999999999 times less noise.
Such a small change in noise would definitely produce a slow self-starving effect. IOW, the addition of the 1.0uF capacitor decreases the noise on each small volume of semiconductor by 0.9999999999999999999 times. Due to the diode square law, the DC voltage output is relative to the noise. IOW, if the noise decreases by X percent, then the DC voltage produced by the diode decreases by X percent. The DC voltage then decreases by 0.9999999999999999999 times, which means there's less reverse DC voltage across the junction, which decreases the depletion width at a linear rate, which means less Johnson noise.
Created on 2009-06-27 15:11:03 by EnergyMover
FE diodes, FE Misc devices, Free energy, Free energy devices, Science, Diode, Free energy, Old theories