Compound semiconductors in group IV

  • Thread starter jwxie
  • Start date
  • #1
jwxie
281
0

Homework Statement



Here is an excerpt from a work

For example, in the case of compound semiconductors in group IV of the periodic table such as silicon, the main donor impurities are those which, being from group V of the period table (arsenic, phosphorous, etc), are substituted in place of a silicon atom in the crystal structure: since silicon is tetravalence, these atoms naturally form four covalent bonds with the silicon atoms around them, and also easily give up their surplus electron to the crystal structure.

Homework Equations



The Attempt at a Solution



What I don't understand is the excerpt.

Okay, silicon is #14, which has 3s2 3p2, total of 4 valence electrons.
But I do not know

(1) first, which and where is this surplus electron referring to / from? from the substitution (group V), or four covalent-bonded silicon?

(2) second, so what about the substitution with an element of group V?

Any comment is appreciated.
 

Answers and Replies

  • #2
PhaseShifter
279
1


A substitution from group V will have five valence electrons instead of four.
 
  • #3
jwxie
281
0


So it is from the substitution, since you can't fit the extra one.

Thanks
 

Suggested for: Compound semiconductors in group IV

  • Last Post
Replies
5
Views
470
  • Last Post
Replies
14
Views
1K
Replies
4
Views
1K
  • Last Post
Replies
7
Views
1K
Replies
9
Views
2K
  • Last Post
Replies
2
Views
733
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
2
Views
912
  • Last Post
Replies
6
Views
1K
Top