11. A "'p n diode "'is a type of semiconductor diode based upon the p n junction. 12. The symbol used for a semiconductor diode in a circuit diagram specifies the type of diode. 13. A semiconductor diode is a semiconductor diode . 14. This is its current meaning, although modern detectors usually consist of semiconductor diodes , transistors, or integrated circuits. 15. A semiconductor diode is a semiconductor diode. 16. A specific type of laser called the semiconductor diode laser is used to read an optical disc. 17. The semiconductor diode is not ideal. 18. A photovoltaic cell is a specialized semiconductor diode that converts light into direct current ( DC ) electricity. 19. The first semiconductor diodes , called cat's whisker diodes, developed around 1906, were made of mineral crystals such as galena. 20. Thus, the point-contact method used to make these first semiconductor diodes 100 years ago is still being used today.
