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Topic: Science
Number of pages / Number of words: 5 / 1190
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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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