Using silicon as the semiconductor base for photodiodes, wavelengths between 190 and 1100 nm can be detected. Through the internal photoelectric effect, electrons are released as charge carriers, with the uneven charge distribution caused by the PN junction leading to a potential difference between the terminals (anode and cathode). The resulting photocurrent is proportional over a wide range of the receiver area and illumination intensity.
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Photodiodes are used in:
- Spectroscopy
- Photography
- Analytical measurement technology
- Optical positioning
- Surface analysis
- Communication technology
- Medical technology
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