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| physical object > artifact > device > instrument > optical device > detector > photodiode | 
| photodiode comparison table | ||
| Subject | has definition | is a kind of | 
|---|---|---|
| detector | optical device | |
| photodiode | A light-sensitive device made from the junction of two differently doped species of a semiconductor such as silicon. Also known as a pn junction. An internal electric field is generated at the junction of p and n type material. Photons absorbed in the junction create electron-hole pairs which are separated by the field and create a current. | detector | 
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