Timeline for Understanding the PN-Junction Built in Voltage
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 9, 2014 at 18:04 | vote | accept | Xavier Hubbard Anderson | ||
| Jun 9, 2014 at 18:04 | |||||
| Jun 9, 2014 at 18:04 | comment | added | Xavier Hubbard Anderson | oh! i didn't know to do that! thanks for telling me! | |
| Jun 9, 2014 at 15:09 | comment | added | thomas.cloud | That stuff is above my head, sorry I can't help anymore. Also, you should probably accept answers to some of your questions. | |
| Jun 8, 2014 at 20:50 | comment | added | Xavier Hubbard Anderson | Is that true? the Law of mass action says that there should be less electrons in the P-doped region than in the N-doped region by several orders of magnitude. p*n = n_i^2 has to be conserved, right? so if we are introducing holes, we are removing electrons and vice-versa. Anyhow, I don't think the answer lies with the concentrations of charge carriers. I think it has to do with ohmic contact and schottky barriers. I'm just not sure what it is specifically yet. | |
| Jun 8, 2014 at 17:35 | comment | added | thomas.cloud | The quantities of electrons are almost identical in both the SI-B & Si-P regions after the p/n junction has stabilized so no voltage would show up on a voltmeter. The electric field across the p/n junction remains b/c their are 9 protons (& 8 e-) in Si-P & 7 protons (& 8 e-) in Si-B setting up the charge differential (& E field along with it). I think it is important to understand the difference b/t the quantity of electrons & the charges of the molecules. | |
| Jun 6, 2014 at 23:32 | comment | added | Xavier Hubbard Anderson | The chemistry perspective is helpful!! I've only ever seen this from an EE point of view. However, I understand conceptually why a space charge region exists in the PN-Junction. The bit I don't understand is why you cannot measure this built in voltage with an external meter! There was an answer on another question, but I wasn't satisfied with it. | |
| Jun 6, 2014 at 16:26 | history | answered | thomas.cloud | CC BY-SA 3.0 |