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Topic: Compound semiconductors

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In the News (Sat 28 Nov 09)

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	Compound Semiconductors: unrivaled by polymers
		Compound semiconductors possess some unrivaled performance characteristics vis a vis bright polymers - the corresponding information is generally available, both on the Internet and in various publications.
		As a direct comparison, using a LED chip size with a typical surface area of 0.25 mm x 0.25 mm, compound semiconductors illuminate to a level of 30 mcd to 60 mcd, while the weak luminescence of a polymer is only between 0.05 and 1.3.
		While compound semiconductors allow the production of all colors to great intensity, and the latest developments are employed to produce the greatest number of colors using less material, polymers can produce certain colors only to very unsatisfactory illumination levels.
	www.aixtron.com /press/ledploye.htm (334 words)

	Compound Semiconductors
		Semiconductors such as GaAs and CdTe are being evaluated for X-ray detection applications which may facilitate an extension of imaging spectrometry into the 10 to 100 keV regime.
		One of the principle advantages of semiconductors over gaseous detection media, is the possibility of keeping device dimensions small in order to achieve high spatial resolution for a comparable quantum efficiency.
		In spectroscopic applications however, semiconductors have another advantage, even over other solid state detectors (such as scintillators), which is that the number of charge carriers generated by the absorption of a photon (or a charged particle) is very high and statistical fluctuations are therefore far less significant.
	www.src.le.ac.uk /instrumentation/solid_state/semiconductors (356 words)

	Semiconductors bases (Site not responding. Last check: 2007-11-05)
		Elemental semiconductors are semiconductors where each atom is of the same type such as Ge, Si.
		These compound semiconductors belong to the III-V semiconductors so called because first and second elements can be found in group III and group V of the periodic table respectively.
		An extrinsic semiconductor consists can be formed from an intrinsic semiconductor by added impurity atoms to the crystal in a process known as doping.
	all-physics.org /SemiconductorBases (1285 words)

	Industry Information - What's Up From SEMI - Industry Research & Statistics
		The companies along the compound semiconductor supply chain had to venture down a long and arduous road until the end of the 1990’s, when both the thirst for increased bandwidth and the for demand handheld devices resulted in rapid growth.
		The compound semiconductor folks are also keeping a watchful eye on the silicon manufacturers that have recently announced silicon germanium (SiGe) based devices for wireless and fiber optic related applications.
		New materials development in compound semiconductors is not occurring at the metallization or dielectric level, as it is with silicon devices, but at the substrate level itself.
	www.semi.org /web/wsemi.nsf/url/0003wuirs (920 words)

	Picogiga, The World Leader In Compound Semiconductors Materials Solutions (Site not responding. Last check: 2007-11-05)
		Any semiconductor material consisting of two or more material elements from groups III and V or groups II and VI of the Periodic Table (elemental semiconductors such as silicon and germanium are found in group IV).
		All semiconductors are either in group IV (the carbon family), or are made from compounds of elements in columns at an equal distance from column IV, such as III-V or II-VI.
		The advantages of compound semiconductors are that they can: convert microwaves to electrical signals in real time; convert electrical energy into light; and withstand radiation and extreme temperatures.
	www.soitec.com /picogiga/glossary.htm (999 words)

	Scientific Principles
		Silicon-based materials dominate in the semiconductor industry and in electronic devices like computers and calculators, but a number of other compounds are also used extensively--including GaAs (or gallium arsenide) which is the material used in the laser of a CD player.
		However, the most important semiconductors are of the extrinsic type, where some impurity (another element) has been intentionally added in the solid to increase the conductivity.
		First, the semiconductor is melted and a seed crystal is used to draw a large crystal of pure, solid semiconductor from the liquid.
	matse1.mse.uiuc.edu /~tw/sc/prin.html (4706 words)

	International Technology Roadmap for Compound Semiconductors (ITRCS) Bulletin Board
		Compound semiconductors such as gallium arsenide (GaAs) and indium phosphide (InP) have brought about or enabled all of these microelectronic, optoelectronics, and wireless marvels.
		Compound semiconductors are critical to the success of many technologies that have opened new markets.
		Whereas, the total compound semiconductor market a few years ago was measured in hundreds of millions of dollars, today it is measured in billions of dollars.
	www.eeel.nist.gov /812/vwpt.htm (883 words)

	Expert in: Compound Semiconductors, Pure Metals
		Expert has 32 years experience in doping of compound semiconductors including dopant choice, efficiency/activation, segregation, and compensation.
		Expert has 32 years experience in doping of compound semiconductors including dopant choice, efficiency/activation, segregation, compensation, and high-resistivity of narrow-gap materials.
		Specializing in narrow-gap compound semiconductors; bill is experience in electrical measurements, IR response, and physical characterization.
	chemindustry.intota.com /viewbio.asp?bioID=603222&perID=108119 (534 words)

	Newswise
		These changes could mean that one material could be used to serve multiple functions in place of two or more materials, creating cheap, fast, efficient lasers, cell phones, computers military sonar devices and medical ultrasound devices.
		Two classes of compounds of current interest to scientists have different but significant technological properties.
		Semiconductors have important optical properties of use in lasers and computers.
	www.newswise.com /articles/2003/6/OPTIPIEZ.UAR.html (394 words)

	5.1.3 Doping of Compound Semiconductors
		The percentage p of the ionic binding energy is closely related to the so-called electronegativity of the elements and varies for the various compounds.
		But in contrast to elemental semiconductors, we now have more possibilities as can be seen by looking at the relevant part of the periodic table.
		The numbers in brackets give the electronegativity, the elements in yellow cells are never used for doping of compound semiconductors.
	www.tf.uni-kiel.de /matwis/amat/semi_en/kap_5/backbone/r5_1_3.html (2101 words)

	Feature Article: Weekly Feature
		The avalanche breakdown field of a semiconductor is the strength of the field, in megavolts per centimeter, that is needed to trigger what is known as avalanche breakdown.
		The bandgap of a semiconductor is a measure of the amount of energy it takes to move an electron from the so-called valence band, in which the electrons are not free to conduct electricity, to the conduction band, in which they are.
		In some semiconductors, an electron falling back from the higher-energy conduction band to the valence band causes the emission of a photon of light.
	www.spectrum.ieee.org /WEBONLY/publicfeature/may02/gani.html (3373 words)

	Compound Semiconductors 2001 (Site not responding. Last check: 2007-11-05)
		The conference covered every aspect of compound semiconductors, including growth, processing, devices, ICs, and applications.
		It also dealt with the III–V based compounds such as GaAs, InP and GaN, IIV–VI compounds, such as ZnSe and ZnS, and IV– and IV materials such as SiC and SiGe.
		The papers are grouped according to subject into: electronic devices; optical devices; magnetic materials; novel systems; quantum transport; optical characterization; quantum nanostructures; and material growth and characterization.
	www.booknews.co.uk /Books/2508.htm (90 words)

	Ohmic Electrical Contacts to Compound Semiconductors (Site not responding. Last check: 2007-11-05)
		Compound semiconductors offer the possibilities and reality of exciting new devices for the electrical engineers.
		The top of the valence band of the semiconductor has an energy equal to the sum of the electron affinity plus the bandgap, which for GaN equals about 7.5 eV.
		General rules have been developed on the basis of this mechanism to predict formation of lower resistance contacts to compound semiconductors in general, and application of these rules to GaN will be discussed.
	cmm.mrl.uiuc.edu /SA03/abstracts/holloway.htm (419 words)

	Compound Semiconductor Technologies - Specialists in Design, Manufacture, Research & Development
		Compound Semiconductor Technologies - Specialists in Design, Manufacture, Research & Development
		First ISO 9001 contract opto foundry is re-accredited
		Compound Semiconductor Technologies Global Ltd, Block 6, Kelvin Campus, West of Scotland Science Park, Maryhill Road,
	www.compoundsemi.co.uk (91 words)

	INEEL BES Program - Surface Reconstructions of Compound Semiconductors (Site not responding. Last check: 2007-11-05)
		Knowledge of the structure of compound semiconductor surfaces is important to increase our fundamental understanding of these materials, and to enhance our ability to use them in practical applications.
		This research addresses the atomic and electronic nature of surface reconstructions and the vital role it plays in initiating island growth on the nanometer scale that is necessary for the formation of self-assembled nanostructures in many cases.
		Zinc blende and wurtzite compounds surface reconstructions will be studied to demonstrate how the detailed nature of the reconstructions themselves effect homoepitaxial and heteroepitaxial growth on compound semiconductor surfaces for both smooth, layer-by-layer growth, and self-assembled nanostructure growth.
	www.inel.gov /env-energyscience/materials/semiconductors.shtml (425 words)

	Semiconductors (Site not responding. Last check: 2007-11-05)
		Jazz Semiconductor Inc. of Newport Beach, California, USA, is taking a step up in the circuit world by launching work on what is believed to be the fastest SiGe technology in the world.
		Sponsored by the Semiconductor Industry Association (SIA) and published by SEMATECH (US) this report is the result of a collaborative effort of industry manufacturers and suppliers, government organizations, consortia, and universities.
		Ball Semiconductor and its joint development partners are developing the technology to build integrated circuits on a silicon sphere rather than on a flat wafer; one-at-a-time instead of in batches; and in small tubes and pipes rather than in large, expensive clean rooms.
	www.ivcon.com /mon/semi.shtml (6311 words)

	NSM Archive - Physical Properties of Semiconductors
		This section is intended to systematize parameters of semiconductor compounds and heterostructures based on them.
		Such a WWW-archive has a number of advantages: in particular, it enables physicists, both theoreticians and experimentalists, to rapidly retrieve the semiconducting material parameters they are interested in.
		In addition, physical parameters - optical, electrical, mechanical, etc. - will be presented in the framework of the electronic archive for both the known and new semiconducting compounds.
	www.ioffe.ru /SVA/NSM/Semicond (207 words)

	NewsFactor Network - - Strain Changes Semiconductors, Researchers Claim (Site not responding. Last check: 2007-11-05)
		The song of the semiconductor might sound like David Bowie's "Changes," except that where Bowie sings about "strange changes," researchers are saying that strain changes the optical, electrical and mechanical properties of semiconductor material.
		Researchers at the University of Arkansas and the College of William and Mary discovered that growing atomic layers of certain materials on a semiconductor surface creates a strain that induces a large energy conversion and emits light in the entire range of the visible spectrum.
		By "squeezing" or straining the semiconductor Scandium nitride (ScN) at the atomic level, Ranjan, Laurent Bellaiche, associate professor of physics at the University of Arkansas, and Eric J. Walter of the College of William and Mary showed that the material goes through optical changes that take it through the visible spectrum.
	www.newsfactor.com /perl/story/22444.html (797 words)

	Semiconductor OneSource: Semiconductor Hall Of Fame
		BARDEEN, John, 1908 (Madison, Wisconsin, USA)- 1991; Contribution to the understanding of electrical conductivity in semiconductors and metals and co-invention of the transistor; The Nobel Prize in Physics 1956 (transistor) and 1972 (superconductors).
		BRATTAIN, Walter, H., 1902 (Amoy, China) — 1987; Discovery of the photo-effect in semiconductors and co-invention of the transistor; The Nobel Prize in Physics 1956.
		Sole responsibility for the content of the Semiconductor Hall of Fame rests with its creator Dr. Jerzy Ruzyllo.
	www.semiconductorhof.com (989 words)

	Silicon substrates provide a disruptive technology for GaN (November 2001) - Compound Semiconductor magazine - Compound ... (Site not responding. Last check: 2007-11-05)
		Along with such exceptional semiconductor characteristics, these materials also possess large saturated electron drift velocities, high junction temperatures, large band discontinuities and breakdown fields, and advantageous piezoelectric behavior.
		Some of these are shown in figure 1 and include opportunities in optoelectronics, microwave and millimeter-wave high-power electronics, optical and mechanical sensors, high-temperature and radiation-tolerant electronics, and high-voltage rectifiers.
		Since it is a wide bandgap semiconductor, the breakdown field is quite high, at approximately five times that of GaAs and silicon, enabling high-voltage operation.
	compsemi.iop.org /magazine/article/7/11/5/1 (1164 words)

	Chips in the Future: It's A Small World
		In its 2003 edition of the International Technology Roadmap for Semiconductors (ITRS), the Semiconductor Industry Association (SIA), along with its counterparts in Europe, Japan, Korea, and Taiwan, updated their 15-year timetable for how the chip sector should shake out.
		Compound that with a company that has at least 10 percent market share.
		Compound that with a company that has at least With 10 percent market share $1.5 billion and the justification of ASIC/ASSP development requires approximately $1billion.
	www.internetnews.com /infra/article.php/3302571 (836 words)

	Compound Semiconductors - Worldwide
		Ace Components Ltd, Preston, UK Ace Components are suppliers of : Electronic Components, Semiconductor crystals, integrated circuits, metal oxide semiconductors, mosfet, semiconductor accessories, semiconductor chips, semiconductor diodes, semiconductors, semiconductor, semiconductors military, semiconductors radio frequency (RF) function, electronic valves.
		Highland Scientific, Bedford, UK Component and spares suppliers to Vacuum Deposition System Users in the Semiconductor, Optical and Ophthalmic Industries Highland Scientific stocks thousands of new and pre-owned spare parts sourced globally from leading companies.
		Micromark C and C D, Maidenhead, Berks, UK Established for over 30 years, Micromark CandCD is one of the leading broadline franchised distributors in the UK.
	www.kellysearch.com /qz-product-82443.html (780 words)

	Solid-State Lighting Issue 15: Selected Business & Technology News (September - November 2002)
		NSF is interested in all manner of advanced materials with potential for improved utility in micro-, nano-, and bio-electronic devices, and in micromagnetics. These materials include those used in mainstream integrated circuits (ICs) such as high-k and low-k dielectrics, silicon-on-insulator (SOI) materials, resists, spin electronics, and interconnected metals, among others.
		Semiconductor light sources and lasers are desirable because they are lightweight and can use battery sources, increasing portability.
		The choice of semiconductor sources in the blue wavelength range is limited to gallium nitride heterostructural devices as a light emitting diode.
	lighting.sandia.gov /Xlightingbizlit15.htm (3119 words)

	UCSB Graduate Studies in Wave Electronics and Technology 1996-97 (Site not responding. Last check: 2007-11-05)
		These courses emphasize optical, guided-wave semiconductor devices such as double heterostructure lasers and integrated optical circuits, and expose the student to the important technology of the future for optical communications and signal processing.
		This is the semiconductor counterpart of the electromagnetically induced transparency which has had a significant impact on the atomic and laser physics community; the transparency in our case is induced by resonant tunneling and does not require external coherent coupling fields.
		A probe station, an HP 4145B semiconductor parameter analyzer, an HP 3325B Function Generator and Waveform Synthesizer, three lock-in amplifiers, and various power supplies and multimeters are used for electronic device characterization.
	www.ece.ucsb.edu /admissions/ab-wet-1-3.html (4589 words)

	International Technology Roadmap for Compound Semiconductors (ITRCS) Bulletin Board
		The acknowledged success of the International Technology Roadmap for Semiconductors for silicon raises some obvious questions: Is now the right time for the compound semiconductor community to undertake an analogous roadmapping challenge?
		Realizing that there are opinions ranging from "the need is critical" to "there is no need," our Semiconductor Electronics Division of the Electrical and Electronics Engineering Laboratory posed such questions as the above in two recent articles, one in the IEEE Spectrum Article1 and the other in the Compound Semiconductor magazine Article2*.
		See slide presentation* of Herbert S. Bennett's talk entitled "The Compound Semiconductor Roadmap Embedded in the ITRS: Implications for the MANTECH Community" given on April 12, 2005.
	www.eeel.nist.gov /812/itrcs.html (522 words)

	Compound Semiconductors
		The phenomenal diversity of compound semiconductor properties gives these materials a huge range of applications.
		These advantages are moving increasing volumes of compound semiconductors into high-speed communications, and optical storage and communications devices.
		Some advanced compound manufacturers are already adopting the approach, aiming to integrate the whole research-to-production process.
	www.panalytical.com /index.cfm?pid=431 (693 words)

	Rockwell Scientific: Rockwell Scientific Receives Contract for High Performance Electronics (Site not responding. Last check: 2007-11-05)
		A major objective of the program will be the development of transistors based on new types of compound semiconductors that employ antimony as a primary constituent.
		These new antimonide-based compound semiconductors (ABCS) have superior electronic properties and lower turn-on voltages compared to present-day semiconductor materials made from silicon, gallium arsenide, and indium phosphide.
		The ABCS technology will be combined with new techniques of circuit fabrication, pioneered by researchers at the University of California, Santa Barbara, to produce circuits for defense and space applications that are the world's fastest and have the lowest (electrical) noise and lowest consumed power.
	www.rsc.rockwell.com /html/pr_electronicscontract.html (255 words)

	Compound Semiconductor - Events - International Symposium on Compound Semiconductors 2005
		Compound Semiconductor - Events - International Symposium on Compound Semiconductors 2005
		The International Symposium on Compound Semiconductors (ISCS) has a long standing tradition in the science, technology, and application of compound semiconductors.
		ISCS-2005 will address III-V and II-VI compound semiconductors as well as SiGe, SiC, and related alloys.
	compoundsemiconductor.net /events/6051 (48 words)

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