What this unit is about?

  • Thread starter nhrock3
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  • #1
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Main Question or Discussion Point

"a silicon cristal is doped with 1000000000000000000 [tex]cm^{-3}[/tex] atoms of antimon"

how does [tex]cm^{-3}[/tex] represents a number of atom

why not just say
"a silicon cristal is doped with 1000000000000000000 atoms of antimon"
 

Answers and Replies

  • #2
MATLABdude
Science Advisor
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That's a concentration. There are 1 x 10^18 atoms of antimony per cubic cm. You need doping level (concentration) in order to calculate semiconductor operation.
 
  • #3
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why cubic cm is cm with power of -3
and not power +3
?

cubic is power +3
 
  • #4
MATLABdude
Science Advisor
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It is! If you know exponents, cm^-3 is the same thing as 1/cm^3. Something per cubic cm, as we say.
 
  • #5
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aaaaahhhhhhhhhhhhhhhh thanks
 

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