What this unit is about?

  • Thread starter nhrock3
  • Start date
  • #1
415
0
"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
1,657
5
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
415
0
why cubic cm is cm with power of -3
and not power +3
?

cubic is power +3
 
  • #4
MATLABdude
Science Advisor
1,657
5
It is! If you know exponents, cm^-3 is the same thing as 1/cm^3. Something per cubic cm, as we say.
 
  • #5
415
0
aaaaahhhhhhhhhhhhhhhh thanks
 

Related Threads on What this unit is about?

  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
3
Views
822
  • Last Post
Replies
5
Views
924
  • Last Post
Replies
22
Views
1K
Replies
9
Views
20K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
3
Views
1K
Replies
7
Views
6K
  • Last Post
Replies
1
Views
967
  • Last Post
Replies
6
Views
1K
Top