Led Solar
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 20x White 38 Pcs LED Spot Track Light Bulb 110V AC E26 US $129.00 
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can we use the ordinary bjt's and the led's as a solar cells as they also have a p-n junction.?
we have read that p-n junction solar cells also exists,so my Qs is that if such is a case then wether we can use bjt's and led's as a solar cells?
normally when one thinks of a solar cell the concern is the amount of power that can be generated. a LED or diode has a pn junction and does act as a light sensitive transducer if you can shine light on the junction, so only glass or clear plastic encapsulated diodes and transistors can be used, most bjt's are encased in opaque epoxy, but LEDs are made with translucent plastic lenses. they are not too efficient as photo diodes but do work as photo diodes and it is possible to use an LED to both send and receive light pulses. since the area of the diode or LED is so small only a very small amount of power can be extracted from the device, so it would take a lot of them to make a solar cell to do anything useful in the way of generating power.
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