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Topic: Science
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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