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by femto
2962 days ago
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Funnily enough, all diodes actually are light emitting, and light receiving, to some extent. It's why diodes are generally in opaque encapsulation. Whether a PN junction is an LED, PV cell or rectifier/switch is a matter of what the design optimises for. Try putting a voltmeter across a glass encased signal diode and shining a strong light on it to see it act as a PV cell. One wouldn't normally use a diode as a PV cell, but if the desired power was very small, a glass encased diode might be used as a cheap PV cell. |
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