Silicon (element)

Silicon (element)
Enricoros at English Wikipedia · Public domain · source
Name	Silicon
Atomic number	14
Category	Metalloid
Appearance	Bluish-gray crystalline solid
Discovered	1824
Discoverer	Jöns Jakob Berzelius
Atomic weight	28.085
Phase	Solid

Silicon (element) is a chemical element with atomic number 14 and symbol Si, a bluish-gray metalloid crucial to modern technology, materials science, geology, and industry. It sits between Boron and Phosphorus in the periodic table and is a principal component of the Earth's crust, forming the basis of rock-forming minerals and underpinning sectors from Semiconductor industry to Construction materials. Silicon's combination of semiconducting properties, abundance, and versatile chemistry links it to numerous people, companies, nations, and institutions that shaped its study and application.

Characteristics

Silicon is a tetravalent metalloid with a diamond cubic crystal structure shared with Carbon and analogous to allotropes studied by Linus Pauling, William Lawrence Bragg, and researchers at Cavendish Laboratory. Its electronic band structure yields an indirect band gap, central to devices developed at Bell Labs, Fairchild Semiconductor, Intel, Texas Instruments, and Advanced Micro Devices. Thermophysical properties such as high melting point relate silicon to refractory materials used by Carnegie Institution for Science and Max Planck Institute researchers. Mechanical hardness and fracture behavior connect silicon to studies by Alan Griffith and standards from International Organization for Standardization. Optical properties inform its use in photovoltaics researched at Massachusetts Institute of Technology, National Renewable Energy Laboratory, Fraunhofer Society, and University of Cambridge. Silicon's chemical behavior—forming covalent bonds with elements like Oxygen, Hydrogen, and Chlorine—relates to foundational work by August Kekulé and later synthetic efforts at DuPont and BASF.

Occurrence and Production

Silicon is the second-most abundant element in the Earth's crust after Oxygen, concentrated in silicate minerals such as Quartz, Feldspar, Mica, Olivine, and Pyroxene. Geological processes studied by James Hutton, Charles Lyell, Alfred Wegener, and Marie Tharp explain silicon-bearing rock distribution across continents like Eurasia, North America, Africa, and Australia. Industrial extraction uses processes developed by innovators at Union Carbide, Kroll Process-era facilities, and companies like Wacker Chemie, REC Silicon, GCL-Poly Energy, and Hemlock Semiconductor to produce metallurgical-grade and electronic-grade silicon. The Carbothermic reduction of Silica in electric arc furnaces and the Czochralski process for single-crystal growth are practiced at Siltronic and SUMCO facilities supplying fabs in Taiwan, South Korea, United States, Germany, and Japan. Supply chains intersect with trade policies of World Trade Organization, energy inputs from ExxonMobil-linked gas markets, and environmental oversight by agencies such as EPA.

Applications

Silicon's foremost application is in the Semiconductor industry for integrated circuits by companies like Intel, TSMC, Samsung Electronics, Qualcomm, and NVIDIA. Photovoltaic cells made by firms such as First Solar, SunPower, Sharp Corporation, and JinkoSolar exploit silicon's photovoltaic effect, with research support from National Renewable Energy Laboratory, Fraunhofer ISE, and Imperial College London. Silicon forms the backbone of structural materials in Construction—notably Portland cement and glass produced by Saint-Gobain and Corning Incorporated—and engineering ceramics from Morgan Advanced Materials and Kyocera. In chemistry, silicones and organosilicon polymers made by Dow Chemical Company, Rhodia, and Momentive serve in aerospace projects of NASA and Boeing. Silicon compounds are vital in microelectromechanical systems developed at Caltech, Stanford University, and ETH Zurich. Medical devices, sensors, and optics from companies like Medtronic and ZEISS rely on silicon-derived materials.

Compounds and Chemistry

Silicon forms a rich family of compounds: silicides studied with transition metals at Max Planck Institute for Chemical Physics of Solids; silanes and polysilanes explored by John Cornforth-era organic chemists; silica polymorphs such as Cristobalite, Tridymite, and Stishovite characterized by mineralogists at Smithsonian Institution; and siloxanes underpinning silicone polymers commercialized by Dow Corning. Surface chemistry of silicon, including hydrogen termination and oxidation, underpins techniques at IBM Research and Bell Labs for passivation and oxide growth (thermal silicon dioxide) crucial to MOSFET technology. Organosilicon chemistry, developed by researchers like Frank R. Mayo and industries such as Wacker and Evonik, produced reagents for organic synthesis and coatings. Silicon's hydrides (silanes) and halides (silicon tetrachloride) connect to safety protocols and industrial production methods standardized by American Society for Testing and Materials.

History and Discovery

Elemental silicon was first isolated by Jöns Jakob Berzelius in 1824, following earlier recognition of silica by figures such as Antoine Lavoisier and mineralogical descriptions by Georges Cuvier and Abraham Gottlob Werner. Nineteenth-century chemists including Humphry Davy and Justus von Liebig advanced understanding of silicon's chemistry. The twentieth century saw silicon become central to electronics after breakthroughs by William Shockley, John Bardeen, and Walter Brattain at Bell Labs, followed by commercialization by Shockley Semiconductor Laboratory, Fairchild Semiconductor, and entrepreneurs like Robert Noyce and Gordon Moore. The development of the Czochralski process and zone refining methods at institutions like Polish Academy of Sciences and industrial labs enabled high-purity crystals for Silicon Valley-era growth. Modern research continues across universities and corporations globally, linking silicon to efforts by European Organization for Nuclear Research, Lawrence Berkeley National Laboratory, and multidisciplinary centers investigating quantum processors, photovoltaics, and materials innovation.

Category:Chemical elements