Silicon

Silicon, symbol Si, is a solid with a metallic sheen at ordinary temperatures. In Earth’s crust it occurs mainly in silica and silicates within materials such as quartz, rocks and clay. Glass, elemental silicon and silicones consequently have different compositions and cannot be treated as interchangeable substances.

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Berzelius obtained relatively pure silicon powder in 1824, an important step in identifying the element. Electronics later required exceptional purity and controlled crystallization. Geological abundance therefore differs from device readiness: ordinary silica-bearing material must undergo substantial chemical and materials processing before precision semiconductor fabrication.

References: [1]

Controlled impurities modify carrier populations and conduction type in crystalline silicon. Differently prepared regions enable junctions, switching, amplification and photoelectric conversion. Crystal defects, contacts and fabricated geometry also affect performance, making precise control of the material more significant than the simple observation that it conducts electricity.

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Silicon transistors emerged at Bell Labs and commercially at Texas Instruments in 1954. Wider operating-temperature ranges and reduced off-state leakage encouraged adoption, provided suitable purity and fabrication methods were available. Laboratory demonstration, commercial production and subsequent integrated circuits remained connected but distinct stages of development.

References: [2]