Question

What was the first device that made use of a semiconductor?

Answer 1

1. A semiconductor is a material used in electronic devices that has conductivity less than metal but more than an insulator. They are also materials that do not obey Ohm's law.
2. In 1833, Michael Faraday discovered that silver sulfide's resistivity decreased with increased temperature, which is a property shown by semiconductors.
3. In 1874, Karl Ferdinand Braun developed the crystal detector. It was the first device made that used semiconductors.

Hence crystal detector was the first device made that used semiconductors.