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Author Topic: Turn a transistor into a solar cell! (Screw it, a phototransistor!)  (Read 329 times)
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http://rimstar.org/renewnrg/make_solar_cell_using_transistor_2n3055.htm

A solar cell is kinda futile, but exposing the wafer to sunlight produces a voltage, this then could be used as an optoisolator or if you're desperate a very very tiny solar panel.

I started looking because I remembered the story at Bell Labs, they had a chunk of silicon and some junctions had impurities in and by co-incidence he had a desk fan on his desk going, and when he used his oscilloscope  he was detecting wave patterns, fluctuations after a bit of further investigation he worked out the fan blades were blocking light, letting light through as the blades spun....

So I wondered if anyone tried to convert a transistor to a phototransistor, not found much except for what I just posted.
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http://www.coilgun.info/theory/phototransistors.htm

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the land of sun+snow
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You've discovered the secret ingredient of life.  Google search, done "first". More efficient than almost anything else.
« Last Edit: October 19, 2013, 11:04:03 pm by oric_dan » Logged

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You've discovered the secret ingredient of life.  Google search, done "first". More efficient than almost anything else.

I already knew it was possible, just never looked into how....
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50 or so years ago the metal capped OC71 transistor used to work well as a photo-transistor if you removed the black outer coating.  

In effect it then became the much more expensive OCP71.  At that time the glass encapsulation was filled with what looked like a clear silicon grease.

It didn't take long for the manufacturer to twig onto this trick and started filling the OC71 bodies with a translucent filler which obscured the junction, so ensuring sales of their OCP71
« Last Edit: October 20, 2013, 03:32:08 pm by jackrae » Logged

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