Trystan Casey
Semiconductors are electrical components that form the foundation of microprocessors, which are found in a wide range of consumer and commercial products, from vehicles to computers and mobile devices. They are defined by their unique electric conductive behaviour, falling somewhere between that of a conductor and an insulator. Semiconductors have a unique ability to act as both an insulator and a conductor as necessary. They are typically made of crystals, mainly silicon crystals, with extra impurities added to their crystal structure to give them their useful electrical properties. The process of inserting impurities is called doping, and it is what enables the electricity to flow across a semiconductor.
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What You'll Learn
- Semiconductors are materials with electrical conductivity between conductors and insulators
- Semiconductors are typically made of silicon crystals
- Doping is the process of inserting impurities into the silicon crystal
- Semiconductors can be used for amplification, switching, and energy conversion
- Examples of semiconductors include silicon, germanium, and gallium arsenide
Semiconductors are materials with electrical conductivity between conductors and insulators
A substance that can conduct electricity is called a conductor, and a substance that cannot conduct electricity is known as an insulator. Conductors allow electrons to flow freely, while insulators do not. Semiconductors, on the other hand, only let electrons flow under certain conditions. The flow of electrons in a semiconductor can be controlled by adding impurities to the material, a process known as "doping".
The electrical properties of a semiconductor material can be modified by doping and by the application of electrical fields, voltage, current, light, or heat. When a semiconductor is doped with Group V elements, they behave like donors, creating free electrons, known as "n-type" doping. When doped with Group III elements, they behave like acceptors, creating free holes, known as "p-type" doping. By combining n-type and p-type semiconductors, devices such as diodes, transistors, and integrated circuits can be created.
Semiconductors are used in a wide range of applications, including solar panels, wind power, electric cars, and electronic circuits. They are also used in high-capacity, medium- to high-voltage cables as part of their insulation, often made of plastic XLPE with carbon black.
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Semiconductors are typically made of silicon crystals
Semiconductors are materials with electrical conductivity between conductors and insulators. Their conductance can be altered by varying the current or voltage applied to a control electrode or by adjusting the intensity of irradiation. They are used in diodes, integrated circuits, transistors, and solar panels.
Silicon crystals are formed by the covalent bonds of silicon atoms with their four nearest neighbours. Each atom has four electrons in its outer orbit, and these electrons are shared with neighbouring atoms, creating a lattice. This lattice structure is critical to silicon's function as a semiconductor.
The electrical properties of silicon crystals can be modified by doping them with impurities. Doping increases the number of charge carriers within the crystal. When doped with Group V elements, they behave like donors, creating free electrons known as "n-type" doping. Conversely, when doped with Group III elements, they act as acceptors, forming free holes called "p-type" doping.
The combination of n-type and p-type silicon results in interesting behaviour at the junction, as seen in diodes. Diodes allow current to flow in one direction but not the other, acting as a one-way turnstile for electrons. This behaviour is fundamental to the function of semiconductor devices.
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Doping is the process of inserting impurities into the silicon crystal
A semiconductor is a material with electrical conductivity that falls between that of a conductor and an insulator. Semiconductors are composed of crystals made of several materials, most commonly silicon.
Doping is the process of inserting impurities into a silicon crystal. It is a method of modifying the electrical properties of a semiconductor material. The process involves adding tiny amounts of solid elements from the nitrogen column of the periodic table to germanium to produce rectification. The doping process was formally developed by John Robert Woodyard during World War II.
The type of impurities inserted into the silicon crystal determines whether the semiconductor will behave like a donor or an acceptor. When a semiconductor is doped by Group V elements, they behave like donors, creating free electrons known as "n-type" doping. On the other hand, when doped by Group III elements, they behave like acceptors, creating free holes known as "p-type" doping.
The concentration of doping can vary from 1013 cm^-3 to 1018 cm^-3, with degenerate doping occurring above 1018 cm^-3 at room temperature. Degenerate doping results in conductivity levels comparable to metals, and these doped semiconductors are often used in integrated circuits.
Doping increases the number of charge carriers within the crystal. The introduction of a dopant with five outer electrons in n-doped semiconductors results in an extra electron that can be moved with relatively little energy into the conduction band. In p-doped semiconductors, the introduction of a 3-valent dopant creates a hole that may be occupied by an electron from the valence band.
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Semiconductors can be used for amplification, switching, and energy conversion
A semiconductor is a material with electrical conductivity that falls between that of a conductor and an insulator. It is defined by its unique electric conductive behaviour, which can be understood through quantum physics. The behaviour of charge carriers, including electrons, ions and electron holes, is the basis of diodes, transistors and most modern electronics.
Semiconductors can be used for amplification, switching and energy conversion. The electrical properties of semiconductor materials can be modified by doping and by the application of electrical fields or light. This means that devices made from semiconductors can be used for the aforementioned applications.
Diodes, transistors and most modern electronics are based on the behaviour of charge carriers at junctions between differently doped semiconducting materials. These junctions are known as p–n junctions, which refer to the excess or shortage of electrons, respectively. A balanced number of electrons would cause a current to flow throughout the material.
Semiconductors with high thermal conductivity can be used for heat dissipation and improving the thermal management of electronics. They are crucial in electric vehicles, high-brightness LEDs and power modules. They also have large thermoelectric power factors, making them useful in thermoelectric generators and coolers.
The first practical application of semiconductors in electronics was the 1904 development of the cat's-whisker detector, a primitive semiconductor diode used in early radio receivers. Since then, semiconductors have been used in laser diodes, solar cells, microwave-frequency integrated circuits and more.
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Examples of semiconductors include silicon, germanium, and gallium arsenide
Semiconductors are crystalline solids with electrical conductivity levels between those of conductors and insulators. They are used in the manufacture of various electronic devices, including diodes, transistors, and integrated circuits. The electrical properties of semiconductors can be modified by doping, which alters their conductivity and makes them useful for amplification, switching, and energy conversion.
Germanium was one of the earliest semiconductor materials used, but it has largely been replaced by silicon. Germanium has four valence electrons in its outer shell, allowing it to gain or lose electrons simultaneously. However, germanium exhibits higher leakage currents than silicon, and its lower melting point makes it less suitable for certain applications.
Gallium arsenide is the second most common semiconductor in use today. It is a compound, unlike silicon and germanium, and is made by combining gallium and arsenic. Gallium arsenide has eight valence electrons, enabling quick responses to electric signals, making it well-suited for amplifying high-frequency signals in television satellites. It is commonly used in optoelectronic and radio frequency applications, such as laser diodes, solar cells, and microwave-frequency integrated circuits.
Other examples of semiconductor materials include tin, selenium, tellurium, and various compound semiconductors composed of two or more elements. The choice of semiconductor material depends on the specific electrical, optical, and physical properties required for the intended application.
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Frequently asked questions
Semiconductors are electrical components that can function as both conductors and insulators. They are used in a wide range of consumer and commercial products, from vehicles to computers and mobile devices.
Elemental semiconductors include antimony, arsenic, boron, carbon, germanium, selenium, silicon, sulfur, and tellurium. Silicon is the most well-known of these.
Semiconductors have a unique electric conductive behaviour, with properties somewhere between a conductor and an insulator. They have many partially filled states and delocalization, which allow for high conductivity. The ability of electricity to flow across a semiconductor can be controlled by combining N-type and P-type semiconductors to form junctions, creating transistors.
