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| Topic: |
Science
|
| Number of pages / Number of words: |
5 / 1190 |
Essay's paper body
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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