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Caption: Photodiodes. A photodiode is a type of diode that allows electric current to flow if the light levels are high enough. A diode is an electronic component that acts as a one-way valve for the flow of electric current. Most are made from a combination of semiconductor materials that allow controlled flow of electricity. These photodiodes are part of a prototype device for varying the position of solar panels to maximise exposure to incident sunlight over the course of the day.

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