Silicon

Silicon
Name	Silicon
Atomic number	14
Atomic weight	28.085
Group	14
Phase	Solid
Appearance	Metallic gray crystalline
Discoverer	Jöns Jakob Berzelius
Discovery year	1824

Silicon is a chemical element with atomic number 14 and a lustrous gray crystalline appearance that is central to modern technology and materials science. It is a tetravalent metalloid that forms a vast array of minerals, alloys, and compounds, underpinning industries from microelectronics to construction. Its properties bridge metallic and nonmetallic behavior, leading to roles in semiconductors, ceramics, and biomaterials that connect to institutions, companies, and research centers worldwide.

Properties

Silicon is a tetravalent element with a diamond cubic crystal structure closely related to that of diamond and Germanium. In its crystalline form it exhibits semiconductor behavior exploited by Bell Labs, Intel, IBM, Texas Instruments, and TSMC in device fabrication. The element's band gap (~1.12 eV at 300 K) and carrier mobility underpin technologies developed at Fairchild Semiconductor, University of California, Berkeley, and Stanford University. Silicon forms strong directional covalent bonds similar to those in Silicones and Silica (SiO2), yielding high melting points and mechanical robustness used by Boeing, Airbus, and Skanska. Thermal conductivity and electronic properties are engineered in heterostructures pioneered at MIT and Caltech. Isotopes such as 28Si are used in precision measurements at National Institute of Standards and Technology and in proposals for quantum computing at D-Wave Systems and Google Quantum AI.

Occurrence and Production

Silicon occurs primarily in oxide and silicate minerals such as Quartz, Feldspar, Mica, Olivine, and Clay minerals found in continental crusts mapped by agencies like the United States Geological Survey and British Geological Survey. Mining and mineral processing by companies including Rio Tinto, BHP, Vale, and Glencore supply raw materials for metallurgical and electronic grades. Production of metallurgical silicon and polysilicon for photovoltaics and semiconductors developed through facilities operated by REC Silicon, Canadian Solar, First Solar, and LONGi Green Energy involves carbothermic reduction in electric arc furnaces with technologies refined in industrial research at Fraunhofer Society and Max Planck Society. Regional industry clusters in Silicon Valley—not to be linked as per instructions—have analogues in manufacturing hubs like Shenzhen and Hsinchu Science Park. Recycling and circular economy initiatives intersect with directives and standards from European Commission and United Nations Environment Programme.

Applications

Silicon underpins microelectronics fabricated in fabs owned by TSMC, Samsung Electronics, Intel, GlobalFoundries, and SMIC. It is the substrate for integrated circuits used in products by Apple Inc., Samsung, NVIDIA, AMD, Qualcomm, and Sony. Photovoltaic cells based on crystalline and thin-film silicon power installations by Enel Green Power, Iberdrola, NextEra Energy, and SunPower Corporation. Silicon-based alloys and castings serve aerospace and automotive manufacturers such as Boeing, Airbus, Toyota, Volkswagen, and General Motors. In construction, silica and silicates provide concrete, glass, and ceramics used by Saint-Gobain, Holcim, and Cemex. Medical-grade silicon derivatives and biocompatible silicones are used in devices from Medtronic, Johnson & Johnson, and Siemens Healthineers. Research into silicon qubits and spintronics links projects at University of Oxford, University of Cambridge, Yale University, and Peking University.

History

Early recognition of silicon-containing minerals dates to civilizations building with Roman concrete and producing glass in workshops patronized by Venice during the Renaissance. Systematic chemical isolation was advanced by Jöns Jakob Berzelius in the 19th century following work by Antoine Lavoisier-era chemists and experimentalists at institutions like the Royal Society. Electrochemical and metallurgical techniques developed in the 20th century at Siemens and Union Carbide enabled mass production. The mid-20th-century invention of the transistor at Bell Labs and the subsequent founding of companies such as Fairchild Semiconductor and Intel launched the semiconductor era. Government-funded programs in the United States, Europe, and Japan, including projects at DARPA, European Space Agency, and Japan Science and Technology Agency, accelerated research into silicon-based electronics and photovoltaics.

Compounds and Chemistry

Silicon forms a wide variety of oxides, silicates, and organosilicon compounds. Silicon dioxide occurs as Quartz, Cristobalite, and Tridymite and is a principal component of Glass and ceramics produced by companies like Corning Incorporated. Organosilicon chemistry, pioneered by researchers such as Frederic Kipping, yielded commercial Silicone polymers used by Dow Chemical Company, BASF, and Wacker Chemie. Silicides (e.g., Molybdenum disilicide) are used in heating elements and contacts in applications by Siemens Energy and ABB. Halides such as silicon tetrachloride are intermediates in optical fiber manufacture by firms like Corning and Nippon Telegraph and Telephone. High-purity silicon chemistry for semiconductors utilizes processes developed at Bell Labs and scaled by fabs at TSMC and Intel.

Safety and Environmental Impact

Inhalation of crystalline silica dust from mining, construction, and manufacturing poses health risks documented by World Health Organization and regulated by agencies such as Occupational Safety and Health Administration and European Chemicals Agency. Occupational diseases like silicosis and associations with International Agency for Research on Cancer classifications have driven controls and standards in industrial operations run by BHP and Rio Tinto. Lifecycle assessments by Intergovernmental Panel on Climate Change and International Energy Agency compare environmental footprints of silicon-based photovoltaics and electronics, informing policies of European Commission and national ministries. Recycling initiatives and emission regulations implemented by United Nations Environment Programme and national regulators aim to reduce impacts from smelting, solvent use, and waste streams managed by firms like Veolia and SUEZ.

Category:Chemical elements