Photoelectric effect: Light on P-N junction causes current flow.

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(D)Electricity and Magnetism - D+60: Solid State and Semiconductors

Photoelectric effect: Light on P-N junction causes current flow. The P-N junction of a clear diode can act as a photoelectric source. A halogen light is used to shine an intense beam of white light on a diode. The current signal is amplified and shown on a screen with a projection ammeter.
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D+60+4
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D+60+6 Several commercial solar cells.