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Unformatted text preview: 3. Name the most common semiconductor material and give four reasons why it is so commonly used. Ans) a. Abundance of silicon. It makes up 25% of the earths crust. b. Higher melting point (1412C) makes for a wide processing range. c. Wider temperature range of operation allows increase in application and reliability. d. Natural growth of SiO 2 allows for a chemical barrier to protect Si from external contamination. 4. What is doping? Why is doping important for semiconductor silicon? Ans) Doping is the process of adding certain elements (dopants) to pure silicon to enhance its material properties, conductivity or resistance. Arsenic, as an example, increases the conductivity by increasing the number of free electrons. This makes it n-type and is negative doping. The addition of Boron would be an example of positive (p-type) doping because it forms more holes. It is easier (requires less energy) to move electrons than it is to move holes....
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This note was uploaded on 09/21/2011 for the course MFGE 4392 taught by Professor You during the Spring '11 term at Texas State.
- Spring '11