Resistivity of Germanium
Germanium is a semiconductor. It is a rare element and is never found in a pure form. The invention of "doping" popularized germanium. By adding small amounts of other substances, it lowered germanium's resistivity and increased its ability to conduct electricity. Doped germanium is used in infrared spectroscopes, camera lenses, electric guitar amplifiers and other devices.
There are two types of "doping", n-type doping and p-type doping. In the n-type doping, atoms that have one more valence electron than the semiconductor atom are added to the semiconductor. This extra electron, which cannot form an electron pair bond, becomes an excess electron. This decreases the semiconductor's resistivity. In p-type doping, atoms with one less valence electron than the semiconductor atom are added to the semiconductor. This will result in "incomplete" bonds or holes in the structure. This will encourage the flow of electrons in the semiconductor material and lower its resistivity.
Semiconductors are essential to the operation of computers, calculators, radios, television sets, video games and many other devices. A semiconductor has electrical properties between metals and insulators but similar to all materials, its resistivity will decrease and will conduct more electricity as its temperature is increased. Resistivity is a material's opposition to the flow of electric current and is the reciprocal of conductivity. It is measured in ohm-meters (m). The formula is = RA/L, where R is resistance, A is the cross-sectional area and L is the length of the conductor.
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