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| Topic: |
Science
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| Number of pages / Number of words: |
5 / 1124 |
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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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Phosphorus,
which has 5 valence electrons, is a donor and causes extra electrons to appear
in the conduction band. 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]...
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