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What will happen when heat is added to silicon?

An intrinsic (pure) silicon crystal at room temperature has sufcient heat (thermal)

energy or some valence electrons to jump the gap rom the valence band into the

conduction band, becoming ree electrons.

escribe the process o doping and e!plain how it alters the atomic structure o

silicon.

It doesnotalter the atomic structure of the silicon at all, what it alters is the balance of bulk valence

band and conduction band electrons in the crystal of silicon thus altering its bulk conductivity.

doping

"he addition o small #uantities o an element (an impurity) to a pure

semiconductor to change its electrical conductivity characteristics.

p$type semiconductor

A doped semiconductor in which conduction is due to the movement o positively$

charged holes.

n$type semiconductor

A doped semiconductor in which conduction is due to the movement o additional

electrons.

What is antimony?

Antimony is a chemical element with symbol Sb and atomic number 51. A lustrous gray metalloid, it is

found in nature mainly as the sulfide mineral stibnite.Antimony si a semimetallic chemical element whichcan exist in two forms: the metallic form is bright, silvery, hard and brittle; the non metallic form is a grey

powder. Antimony is a poor conductor of heat and electricity, it is stable in dry air and is not attaced by

dilute acids or alalis. Antimony and some of its alloys expand on cooling.

Antimony has been nown since ancient times. !t is sometimes found free in nature, but is usually

obtained from the ores stibnite "Sb#S$% and valentinite "Sb#&$%. 'icolas ()mery, a *rench chemist, was

the first person to scientifically study antimony and its compounds. +e published his findings in 1-.

Antimony maes up about -.----# of the earth/s crust.

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"o orward bias a diode, to which region must the positive terminal o a voltage

source be connected?

%!plain why a series resistor is necessary when a diode is orward biased?