1 / 10

Semiconductors

Semiconductors. What Is A Semiconductor?. A semiconductor is a substance that has a lower conductivity than a metal and a higher conductivity than a non-metal. They appear at the divide between metals and non-metals on the periodic table, for example silicone and Germanium.

flod
Download Presentation

Semiconductors

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Semiconductors

  2. What Is A Semiconductor? • A semiconductor is a substance that has a lower conductivity than a metal and a higher conductivity than a non-metal. • They appear at the divide between metals and non-metals on the periodic table, for example silicone and Germanium. • There are two types of semiconductor, p type and n type.

  3. P type Semiconductors • P type semiconductors are made by adding an atom with one less outer electron than the other atoms in the surrounding network. • This means that the ‘impurity’ atom creates a hole where an electron would normally be, leaving room for electrons to move into allowing for electric current to flow.

  4. N type Semiconductors • N type semiconductors are made by adding an atom with one more outer electron than the other atoms in the surrounding network. • This means that the ‘impurity’ atom supplies an extra electron to carry charge.

  5. Conduc(k)tivity • As a semiconductor’s heat increases so to does its electrical conductivity. • Also a semiconductor’s conductivity increases with exposure to light.

  6. Uses of the Semiconductor • Can be used in photovoltaic cells, a vital component in solar cells. • Commonly used to make electronic devices such as transistors, diodes and integrated circuits.

  7. Questions From the Past A • The electrical conductivity of the semiconductor gallium arsenide increases on exposure to light. • What name is given to this phenomenon? • Answer: Photoconductivity

  8. Another Question • An example of a p-type semiconductor is • silicon doped with • A carbon • B arsenic • C aluminium • D phosphorus • D is the answer.

  9. End THANKS FOR WATCHING AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

More Related