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| Topic: |
Science
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| Number of pages / Number of words: |
5 / 1201 |
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introducing a very small amount of
impurity, of the order of one in a million atoms. There are 2 kinds of
dopant. Those which have more valence electrons that the semiconductor
itself are called "donors" and those which have fewer are termed
"acceptors" [Book 2].
In a silicon crystal, each atom has 4 valence electrons, which are
shared with a neighbouring atom to form a stable tetrahedral structure...
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Silicon so doped is called "n-
type" [Book 5]. On the other hand, boron, with a valence of 3, is an
acceptor, leaving so-called "holes" in the lattice, which act like
positive charges and render the silicon "p-type"[Book 5]. The drawings in
Figure 1.2 are 2-dimensional representations of n-and p-type silicon
crystals, in which the atomic nucleii in the lattice are indicated by
circles and the bonding valence electrons are shown as lines between the
atoms...
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