Photoconductors and Photoconductive Gain
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- เผยแพร่เมื่อ 16 ส.ค. 2019
- / edmundsj
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Photoconductors are a really cool way of sensing incoming light, and have some advantages over their more traditional photodiode counterparts. In this video, I explain why, and what the responsivity of a photoconductor depends on.
This is part of my graduate series on optoelectronics / photonics, and is based primarily on Coldren's book on Lasers as well as graduate-level coursework I have taken in the EECS department at UC Berkeley.
Hope you found this video helpful, please post in the comments below anything I can do to improve future videos, or suggestions you have for future videos.
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Thanks for the great lecture! Since electron hole pairs are able to stick around for longer time in photoconductors, does the response time for current saturation get longer along with increased current? For optical sensor, I guess the response time might be also important.
真的非常感谢老师，讲得非常清楚，简洁明了
i must admire ´! what an amazing explantion
Wow, awesome lecture. Thank you so much!
It is great, true!
So i got a a question at 5:34,in photocurrent transients you see that same decay after your turn on the light which after certain period you turn it off.Does that decay indicate that during the period which light was turned on,the external bias was removed ? Or is it due to something else like recombination losses? Thanks in advance and great explanation!
do you have a video on photodetectors and photovoltaics?
Thank you for the informative video.. I would like to ask which reference book you recommend?
It is an amazing explanation, true!
Hi Jordan. Could you tell me what is the difference between operating a photodiode in photoconductive mode or photovoltaic mode? How are the outputs different and what wiring is required? Many thanks
“photovoltaic mode” means you don’t impose a voltage on the diode, you let the current flow back through the PN junction and develop a forward bias. You basically treat it like a solar cell. In “photoconductive mode” you force a (reverse) bias voltage across the diode, and so none of the current flows back through the PN junction and you can collect all of it elsewhere. For photoconductive mode, see “TIA photodiode” for an application circuit. No one in their right mind uses a diode in photovoltaic mode as a sensor unless you want to use it to power something.
@@JordanEdmundsEECS Thanks very much, Jordan!
Please cover chapter 14 in Neaman indepth
Which playlist is this under ?
Should be Optoelectronics