Tutorial: Photoconductivity
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- Опубликовано: 10 фев 2025
- MIT 2.627 Fundamentals of Photovoltaics, Fall 2011
View the complete course: ocw.mit.edu/2-6...
Instructor: Joe Sullivan
This video describes how light shining on a Si semiconductor causes its conductivity to rise, by photon energy breaking covalent bonds, creating mobile electrons and holes.
License: Creative Commons BY-NC-SA
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Speaking for myself; these OpenCourseWare videos are very much appreciated.
I believe that free education helps to advance the progress of mankind. Furthermore, if society provided the necessary resources for survival like clean water, shelter, and fruits/vegetables, people would have more time to focus on learning rather than just surviving. How much time can you devote to mathematics, physics, literature, philosophy etc if you have to spend so much of your day just to get some food and water?
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MIT is awesome
This guy doesn't blink
In order to measure the Resistance, the Ohmmeter must inject a current into the sample. The voltage drop across the sample, together with the known injected current, gives us the Resistance via Ohm's Law. The injected current is an important parameter to know -- how much current is injected? And, how do these results change as the amount of injected current changes? I'm disappointed that MIT did not make this additional data available to us, because it is, in effect, a 'hidden variable' in this demonstration. (I suppose we could acquire an EXTECH DMM and measure it -- but note, this is also on the AUTO-RANGING SCALE which means that the meter 'hunts' for the best range be injecting varying currents until it finds a suitable one. This is another effect that is not dealt with in this presentation.)
Well explained
Now see this question from question paper what are the advantages of using doped semiconductors rather than pure semiconductors😅😮 is this correct the teacher hs told the doped changes the property of
why we need metal contact on silicon is it a necessary or just to fix end multimeter
This has something to do with how aliens lift people up into the air into their ships.
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