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Longman Dictionary of Contemporary English
▪ National Semiconductor is the fourth largest semiconductor company in the United States with sales of over US$ 2 billion in 1992.
▪ In theory the display could be huge, if only a perfect, large semiconductor substrate could be made.
▪ The volume of semiconductor business was up 8% on last year after product line pruning.
▪ One is taking place inside the semiconductor business itself.
▪ The stencils are sold to companies which use them to produce semiconductor chips.
▪ Electronics, including makers of semiconductor chips and equipment, came in first, with 21 stocks among the top 100.
▪ Flash memory is a type of semiconductor chip used to store data in computers and electronic devices.
▪ The Semiconductor Industry Association yesterday said shipments of semiconductor chips declined in December, indicating demand could be slowing.
▪ National Semiconductor is the fourth largest semiconductor company in the United States with sales of over US$ 2 billion in 1992.
▪ At Unisys, another Rancho Bernardo semiconductor company, officials said they made the same change last year.
▪ Some other semiconductor companies, listed on the Big Board, had to stop trading because of order imbalances.
▪ He was, in fact, vice chairman of a semiconductor company when Clinton appointed him archivist.
▪ Computer, software and semiconductor companies participated in the good news.
▪ At the time, it was the first semiconductor company to win an engineering Emmy.
▪ Computer, software and semiconductor companies advanced as Lam Research and Lattice Semiconductor announced profits surpassing analysts' estimates.
▪ The semiconductor devices are all fairly sensitive to excess heat, so don't fry them during soldering!
▪ These unique circuits contain semiconductor devices as well as other discrete electronic components soldered on a thin alumina substrate.
▪ The devices are also much smaller and use a lot less power than semiconductor devices.
▪ Finally the two semiconductor devices can be considered.
▪ Microchips aid quantum physics Technology from the semiconductor industry has allowed an experiment in fundamental physics previously possible only in theory.
▪ The semiconductor industry supplier released no news.
▪ It may turn out to earn rather more than that in the semiconductor industry.
▪ For the semiconductor industry, 1996 was the year to forget.
▪ Since 1991 the semiconductor industry has grown by an average of nearly 27 percent a year.
▪ As a result, Whittington is one of the most closely watched analysts on the semiconductor industry.
▪ It also deals with gaseous chemicals, specialised gas mixtures and high purity gases for the semiconductor industry.
▪ Bookto-bill has recently become an imperfect predictor of semiconductor industry sales and shipments.
▪ It claims its semiconductor makers can make money.
▪ Soundview Financial Group intensified the concerns by lowering its investment opinions on four semiconductor makers.
▪ Pricing is being left to each of the six semiconductor makers.
▪ Through joint participation, 13 semiconductor manufacturers from seven countries share knowledge and expertise in ways that ultimately influence the entire industry.
▪ Many of the companies appear to have avoided direct competition in the computer or semiconductor market by staking out a profitable niche.
▪ States looking to attract semiconductor plants invariably offer financial incentives to companies that locate there.
▪ During 2000, semiconductor sales grew by around 36 per cent.
▪ Dataquest analysts predict worldwide semiconductor sales will top $ 300 billion by the year 2000.
▪ Last month, the Semiconductor Industry Association revised its forecast for annual semiconductor sales growth down to 6. 7 percent.
▪ The simplest integrated circuit consists of three layers, one of which is made of semiconductor material.
▪ Aetrium, which produces equipment used to make and test semiconductors, rose 1 3 / 4 to 19.
▪ Motorola also said its profits were hurt by the start-up costs of building plant space to make semiconductor products.
▪ Of the 31 California companies on the list, 25 make semiconductors, software, computers or telecommunications gear.
▪ In a pure semiconductor the valence band is essentially filled and the higher conduction band essentially empty.
▪ In some other devices semiconductor beads are used instead of metallic sensors.
▪ Of the 31 California companies on the list, 25 make semiconductors, software, computers or telecommunications gear.
▪ Other semiconductor, computer and software issues followed suit.
▪ Relays have kept pace with advances in semiconductor technology.
▪ Shares of suppliers of semiconductor components to the communications and personal computer markets also slipped.
▪ Steel and semiconductors are two of the industries that have benefited significantly from anti-dumping laws.
▪ The devices are also much smaller and use a lot less power than semiconductor devices.
Douglas Harper's Etymology Dictionary

1838, "material whose electrical conductivity is between that of a conductor and that of an insulator," from semi- + conductor. Modern very specific sense is recorded from 1931.


n. (context physics English) A substance with electrical properties intermediate between a good conductor and a good insulator.

  1. n. a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities [syn: semiconducting material]

  2. a conductor made with semiconducting material [syn: semiconductor device, semiconductor unit]


Semiconductors are crystalline or amorphous solids with distinct electrical characteristics. They are of high resistance — higher than typical resistance materials, but still of much lower resistance than insulators. Their resistance decreases as their temperature increases, which is behavior opposite to that of a metal. Finally, their conducting properties may be altered in useful ways by the deliberate, controlled introduction of impurities (" doping") into the crystal structure, which lowers its resistance but also permits the creation of semiconductor junctions between differently-doped regions of the extrinsic semiconductor crystal. The behavior of charge carriers which include electrons, ions and electron holes at these junctions is the basis of diodes, transistors and all modern electronics.

Semiconductor devices can display a range of useful properties such as passing current more easily in one direction than the other, showing variable resistance, and sensitivity to light or heat. Because the electrical properties of a semiconductor material can be modified by doping, or by the application of electrical fields or light, devices made from semiconductors can be used for amplification, switching, and energy conversion.

The modern understanding of the properties of a semiconductor relies on quantum physics to explain the movement of charge carriers in a crystal lattice. Doping greatly increases the number of charge carriers within the crystal. When a doped semiconductor contains mostly free holes it is called " p-type", and when it contains mostly free electrons it is known as " n-type". The semiconductor materials used in electronic devices are doped under precise conditions to control the concentration and regions of p- and n-type dopants. A single semiconductor crystal can have many p- and n-type regions; the p–n junctions between these regions are responsible for the useful electronic behavior.

Although some pure elements and many compounds display semiconductor properties, silicon, germanium, and compounds of gallium are the most widely used in electronic devices. Elements near the so-called " metalloid staircase", where the metalloids are located on the periodic table, are usually used as semiconductors.

Some of the properties of semiconductor materials were observed throughout the mid 19th and first decades of the 20th century. The first practical application of semiconductors in electronics was the 1904 development of the Cat's-whisker detector, a primitive semiconductor diode widely used in early radio receivers. Developments in quantum physics in turn allowed the development of the transistor in 1947 and the integrated circuit in 1958.

Semiconductor (artists)

Semiconductor (also Semiconductor Films) are British artist duo Ruth Jarman and Joe Gerhardt producing computer animation.

Semiconductor (disambiguation)

A semiconductor is a material with electrical conductivity due to electron flow intermediate in magnitude between that of a conductor and an insulator.

Semiconductor or semi-conductor may also refer to:

  • Semiconductor device, an electronic component that exploits the electronic properties of semiconductor materials
  • Semi-Conductor (album), a compilation album by Larry Fast
  • Semiconductor (artists), also known as Semiconductor Films, names used by British art duo Ruth Jarman and Joe Gerhardt

Usage examples of "semiconductor".

The electron microscopy and X-ray data in the government report led him to the conclusion that there were pseudorandom semiconductor and unlike metal junctions.

The electron microscopy and X ray data in the government report led him to the conclusion that there were pseudorandom semiconductor and unlike metal junctions.

Several groups have also looked at the photoreduction of metal ions out of solution onto a semiconductor surface.

The metallorganics that fuse DNA with semiconductor and comprise his brain have few nerves of their own.

By the way, using semiconductors for the photocatalytic destruction of water pollutants has also been a huge research focus over the last couple of decades.

What humans call light and microwaves are only different regions in the electromagnetic spectrum, so resize and recalibrate new semiconductor structures to emit microwaves.

Analysis showed it to be made of various semimetal materials, such as were unknown to us, created from what we could have called artificial atoms, where semiconductor dots contained thousands of electrons.

Using patent data in the semiconductor industry, Song and his coworkers show how Korean and Taiwanese semiconductor firms were able to catch up to the leading-edge U.

We can compare the quantitative predictions of quantum theory with the measured wavelengths of spectral lines of the chemical elements, the behaviour of semiconductors and liquid helium, microprocessors, which kinds of molecules form from their constituent atoms, the existence and properties of white dwarf stars, what happens in masers and lasers, and which materials are susceptible to which kinds of magnetism.

Here is a miniboom of look-alike public housing, the pickup-crowded parking lots of Fairchild Semiconductor, the bustle of the oil and gas industry, the beginnings of a tourist industry.

Reverend Jim Jones, a Jim Jones for the high-tech age, Jim Jones with a silicon heart and tightly packed semiconductors between the ears.

Rattlesnakes and doped semiconductors detect infrared radiation perfectly well.

From the rear window panel of the van, the invisible beam of the device's near-infrared semiconductor laser diode had been aimed at a ninety-degree angle through the back windshield at the Fiat's rearview mirror.

They combine P3HT, a semiconductor polymer, with carefully sized microclusters of cadmium selenide.

Built around nanotechnologies, the microelectromechanical systems combined computers with tiny semiconductor chips.