Timeline for Why is the law of the p-n junction valid under forward bias?
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| Sep 24, 2014 at 22:41 | comment | added | Amerez | Thanks for this quick reply. But, The derivation of the law of the junction sets the net current to zero (diffusion = drift). This in the derivation itself. See the first 5 equations in my question. | |
| Sep 24, 2014 at 22:39 | comment | added | Jon Custer | The reasoning that the 'law of the junction' assumes the net current is zero is where your thinking goes off. You can calculate the diffusion and drift components under any given junction voltage. The built-in voltage is special because it happens to correspond to a special circumstance of no net current flowing. When there is net current flowing, well, that is the result of the diffusion and drift currents not canceling, that is all. | |
| Sep 24, 2014 at 22:38 | comment | added | Amerez | No, I never indicated in the question that they are different under forward bias. I'm merely saying (what you just said): The net current is the sum of the diffusion and drift currents, and it is not zero, and, as the derivation of the law of the junction assumes the net current is zero, this renders the derivation of the law invalid. Can you please show me where exactly I'm wrong, in the question and in the equations ? | |
| Sep 24, 2014 at 22:03 | history | answered | Jon Custer | CC BY-SA 3.0 |