LT 1 Flashcards
How many valence electrons do conductors have
1-3
How many valence electrons do insulators have
5-8
How many valence electrons do semiconductor have
4
What are the two commonly used semiconductors? Which is more popular and why?
Silicon and Germanium. Silicon because of its ability to withstand higher temperatures
What pattern do semiconductor materials arrange themselves when doing the process known as covalent bonding
Crystal-lattice structure
What two types of semiconductor material can be made when doping
N-Type and P-Type
N-Type semiconductor is formed when an impurity having ___ is introduced into semiconductor crystal. This impurity is said to be ___.
Five valence electrons,
Pentavalent
Name 3 examples of N-Type semiconductors
Arsenic, antimony and phosphorous
P-Type semiconductor is formed when an impurity having ___ is introduced into semiconductor crystal. This impurity is said to be ___.
Three valence electrons,
Trivalent,
Name 3 examples of P-Type materials
Aluminum, boron, and gallium
Do semiconductors have a Positive or Negative temperature coefficient
Negative
What 2 things can you use to keep LEDs, Diodes and transistors cool?
Heat sinks and Fans
