Conduction band - Revision history

Jmdonev: 1 revision imported: Doing upload, largely of old redirects.

2018-06-04T16:52:32Z

1 revision imported: Doing upload, largely of old redirects.

← Older revision	Revision as of 16:52, 4 June 2018
(No difference)

Jmdonev at 21:50, 1 June 2018

2018-06-01T21:50:50Z

← Older revision		Revision as of 21:50, 1 June 2018
Line 1:		Line 1:
	[[Category:Done 2018-04-30]]		[[Category:Done 2018-06-01]]
	[[File:Conduction band.png\|360px\|thumbnail\|Figure 1.<ref>Wikimedia Commons. ''File:Isolator-metal.svg'' [Online]. Available: https://commons.wikimedia.org/wiki/File:Isolator-metal.svg</ref> A diagram showing the valence and conduction bands of insulators, metals, and semiconductors. The Fermi level is the name given to the highest energy occupied electron orbital at [[absolute zero]].<ref name = b>UC Davis ChemWiki. (August 14, 2015). ''Band Theory of Semiconductors'' [Online]. Available: http://chemwiki.ucdavis.edu/u_Materials/Electronic_Properties/Band_Theory_of_Semiconductors</ref>]]		[[File:Conduction band.png\|360px\|thumbnail\|Figure 1.<ref>Wikimedia Commons. ''File:Isolator-metal.svg'' [Online]. Available: https://commons.wikimedia.org/wiki/File:Isolator-metal.svg</ref> A diagram showing the valence and conduction bands of insulators, metals, and semiconductors. The Fermi level is the name given to the highest energy occupied electron orbital at [[absolute zero]].<ref name = b>UC Davis ChemWiki. (August 14, 2015). ''Band Theory of Semiconductors'' [Online]. Available: http://chemwiki.ucdavis.edu/u_Materials/Electronic_Properties/Band_Theory_of_Semiconductors</ref>]]

	<onlyinclude>The '''conduction band''' is the band of electron [[orbital]]s that electrons can jump up into from the [[valence band]] when excited. When the electrons are in these orbitals, they have enough [[energy]] to move freely in the material. This movement of electrons creates an [[electric current]].</onlyinclude> The valence band is simply the outermost electron orbital of an atom of any specific material that electrons actually occupy. The energy difference between the highest occupied energy state of the valence band and the lowest unoccupied state of the conduction band is called the band gap and is indicative of the [[conductivity]] of a material.<ref>''Introduction to Energy Bands'' [Online]. Available:http://www.doitpoms.ac.uk/tlplib/semiconductors/energy_band_intro.php</ref> A large band gap means that a lot of energy is required to excite [[valence electron]]s to the conduction band. Conversely, when the valence band and conduction band overlap as they do in [[metal]]s, electrons can readily jump between the two bands (see Figure 1) meaning the material is highly conductive.<ref name = a>Hyperphysics. (August 14, 2015). ''Conductor Energy Bands'' [Online]. Available:http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html#c6</ref>		<onlyinclude>The '''conduction band''' is the band of electron [[orbital]]s that electrons can jump up into from the [[valence band]] when excited. When the electrons are in these orbitals, they have enough [[energy]] to move freely in the material. This movement of electrons creates an [[electric current]].</onlyinclude> The valence band is simply the outermost electron orbital of an atom of any specific material that electrons actually occupy. The energy difference between the highest occupied energy state of the valence band and the lowest unoccupied state of the conduction band is called the band gap and is indicative of the [[electrical conductivity]] of a material.<ref>''Introduction to Energy Bands'' [Online]. Available:http://www.doitpoms.ac.uk/tlplib/semiconductors/energy_band_intro.php</ref> A large band gap means that a lot of energy is required to excite [[valence electron]]s to the conduction band. Conversely, when the valence band and conduction band overlap as they do in [[metal]]s, electrons can readily jump between the two bands (see Figure 1) meaning the material is highly conductive.<ref name = a>Hyperphysics. (August 14, 2015). ''Conductor Energy Bands'' [Online]. Available:http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html#c6</ref>

	[[Insulator]]s are characterized by a large band gap, so a prohibitively large amount of energy is required to move electrons into the conduction band to form a current.<ref>Hyperphysics. (August 14, 2015). ''Insulator Energy Bands'' [Online]. Available: http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html#c4</ref> [[Conductor]]s have an overlap between the conduction and valence bands, so the valence electrons in such conductors are essentially free.<ref name = a></ref> [[Semiconductor]]s, on the other hand, have a small band gap that allows for a meaningful fraction of the valence electrons of the material to move into the conduction band given a certain amount of energy. This property gives them a conductivity between conductors and insulators, which is part of the reason why they are ideal for [[electric circuit]]s as they will not cause a [[short circuit]] like a conductor.<ref name = b></ref> This band gap also allows semiconductors to convert [[light]] into [[electricity]] in [[photovoltaic cell]]s and to emit light as [[LED]]s when made into certain types of [[diode]]s. Both these processes rely on the energy absorbed or released by electrons moving between the conduction and valence bands.		[[Insulator]]s are characterized by a large band gap, so a prohibitively large amount of energy is required to move electrons into the conduction band to form a current.<ref>Hyperphysics. (August 14, 2015). ''Insulator Energy Bands'' [Online]. Available: http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html#c4</ref> [[Conductor]]s have an overlap between the conduction and valence bands, so the valence electrons in such conductors are essentially free.<ref name = a></ref> [[Semiconductor]]s, on the other hand, have a small band gap that allows for a meaningful fraction of the valence electrons of the material to move into the conduction band given a certain amount of energy. This property gives them a conductivity between conductors and insulators, which is part of the reason why they are ideal for [[electric circuit]]s as they will not cause a [[short circuit]] like a conductor.<ref name = b></ref> This band gap also allows semiconductors to convert [[light]] into [[electricity]] in [[photovoltaic cell]]s and to emit light as [[LED]]s when made into certain types of [[diode]]s. Both these processes rely on the energy absorbed or released by electrons moving between the conduction and valence bands.

Jmdonev: 1 revision imported

2018-05-11T18:17:08Z

1 revision imported

← Older revision	Revision as of 18:17, 11 May 2018
(No difference)

Jmdonev at 21:54, 9 May 2018

2018-05-09T21:54:39Z

← Older revision		Revision as of 21:54, 9 May 2018
Line 1:		Line 1:
	[[Category:Done ~~2015~~-08-21]]		[[Category:Done 2018-04-30]]
	[[File:Conduction band.png\|360px\|thumbnail\|Figure 1.<ref>Wikimedia Commons. ''File:Isolator-metal.svg'' [Online]. Available: https://commons.wikimedia.org/wiki/File:Isolator-metal.svg</ref> A diagram showing the valence and conduction bands of insulators, metals, and semiconductors. The Fermi level is the name given to the highest energy occupied electron orbital at [[absolute zero]].<ref name = b>UC Davis ChemWiki. (August 14, 2015). ''Band Theory of Semiconductors'' [Online]. Available: http://chemwiki.ucdavis.edu/u_Materials/Electronic_Properties/Band_Theory_of_Semiconductors</ref>]]		[[File:Conduction band.png\|360px\|thumbnail\|Figure 1.<ref>Wikimedia Commons. ''File:Isolator-metal.svg'' [Online]. Available: https://commons.wikimedia.org/wiki/File:Isolator-metal.svg</ref> A diagram showing the valence and conduction bands of insulators, metals, and semiconductors. The Fermi level is the name given to the highest energy occupied electron orbital at [[absolute zero]].<ref name = b>UC Davis ChemWiki. (August 14, 2015). ''Band Theory of Semiconductors'' [Online]. Available: http://chemwiki.ucdavis.edu/u_Materials/Electronic_Properties/Band_Theory_of_Semiconductors</ref>]]

	<onlyinclude>The '''conduction band''' is the band of electron [[orbital]]s that electrons can jump up into from the [[valence band]] when excited. When the electrons are in these orbitals, they have enough [[energy]] to move freely in the material. This movement of electrons creates a [[current]].</onlyinclude> The valence band is simply the outermost electron orbital of an atom of any specific material that electrons actually occupy. The energy difference between the highest occupied energy state of the valence band and the lowest unoccupied state of the conduction band is called the band gap and is indicative of the [[conductivity]] of a material.<ref>''Introduction to Energy Bands'' [Online]. Available:http://www.doitpoms.ac.uk/tlplib/semiconductors/energy_band_intro.php</ref> A large band gap means that a lot of energy is required to excite [[valence electron]]s to the conduction band. Conversely, when the valence band and conduction band overlap as they do in [[metal]]s, electrons can readily jump between the two bands (see Figure 1) meaning the material is highly conductive.<ref name = a>Hyperphysics. (August 14, 2015). ''Conductor Energy Bands'' [Online]. Available:http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html#c6</ref>		<onlyinclude>The '''conduction band''' is the band of electron [[orbital]]s that electrons can jump up into from the [[valence band]] when excited. When the electrons are in these orbitals, they have enough [[energy]] to move freely in the material. This movement of electrons creates an [[electric current]].</onlyinclude> The valence band is simply the outermost electron orbital of an atom of any specific material that electrons actually occupy. The energy difference between the highest occupied energy state of the valence band and the lowest unoccupied state of the conduction band is called the band gap and is indicative of the [[conductivity]] of a material.<ref>''Introduction to Energy Bands'' [Online]. Available:http://www.doitpoms.ac.uk/tlplib/semiconductors/energy_band_intro.php</ref> A large band gap means that a lot of energy is required to excite [[valence electron]]s to the conduction band. Conversely, when the valence band and conduction band overlap as they do in [[metal]]s, electrons can readily jump between the two bands (see Figure 1) meaning the material is highly conductive.<ref name = a>Hyperphysics. (August 14, 2015). ''Conductor Energy Bands'' [Online]. Available:http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html#c6</ref>

	[[Insulator]]s are characterized by a large band gap, so a prohibitively large amount of energy is required to move electrons into the conduction band to form a current.<ref>Hyperphysics. (August 14, 2015). ''Insulator Energy Bands'' [Online]. Available: http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html#c4</ref> [[Conductor]]s have an overlap between the conduction and valence bands, so the valence electrons in such conductors are essentially free.<ref name = a></ref> [[Semiconductor]]s, on the other hand, have a small band gap that allows for a meaningful fraction of the valence electrons of the material to move into the conduction band given a certain amount of energy. This property gives them a conductivity between conductors and insulators, which is part of the reason why they are ideal for [[circuit]]s as they will not cause a [[short circuit]] like a conductor.<ref name = b></ref> This band gap also allows semiconductors to convert [[light]] into [[electricity]] in [[photovoltaic cell]]s and to emit light as [[LED]]s when made into certain types of [[diode]]s. Both these processes rely on the energy absorbed or released by electrons moving between the conduction and valence bands.		[[Insulator]]s are characterized by a large band gap, so a prohibitively large amount of energy is required to move electrons into the conduction band to form a current.<ref>Hyperphysics. (August 14, 2015). ''Insulator Energy Bands'' [Online]. Available: http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html#c4</ref> [[Conductor]]s have an overlap between the conduction and valence bands, so the valence electrons in such conductors are essentially free.<ref name = a></ref> [[Semiconductor]]s, on the other hand, have a small band gap that allows for a meaningful fraction of the valence electrons of the material to move into the conduction band given a certain amount of energy. This property gives them a conductivity between conductors and insulators, which is part of the reason why they are ideal for [[electric circuit]]s as they will not cause a [[short circuit]] like a conductor.<ref name = b></ref> This band gap also allows semiconductors to convert [[light]] into [[electricity]] in [[photovoltaic cell]]s and to emit light as [[LED]]s when made into certain types of [[diode]]s. Both these processes rely on the energy absorbed or released by electrons moving between the conduction and valence bands.

			== For Further Reading ==
			For further information please see the related pages below:
			*[[Semiconductor]]
			*[[Metal]]
			*[[Photovoltaic cell]]
			*[[AC to DC adapter]]
			* Or explore a [[Special:Random\| random page!]]

	==References==		==References==
	{{reflist}}[[Category:Uploaded]]		{{reflist}}[[Category:Uploaded]]

J.williams: 1 revision imported

2015-08-26T21:31:51Z

1 revision imported

← Older revision	Revision as of 21:31, 26 August 2015
(No difference)

J.williams at 18:50, 24 August 2015

2015-08-24T18:50:36Z

New page

[[Category:Done 2015-08-21]]
[[File:Conduction band.png|360px|thumbnail|Figure 1.<ref>Wikimedia Commons. ''File:Isolator-metal.svg'' [Online]. Available: https://commons.wikimedia.org/wiki/File:Isolator-metal.svg</ref> A diagram showing the valence and conduction bands of insulators, metals, and semiconductors. The Fermi level is the name given to the highest energy occupied electron orbital at [[absolute zero]].<ref name = b>UC Davis ChemWiki. (August 14, 2015). ''Band Theory of Semiconductors'' [Online]. Available: http://chemwiki.ucdavis.edu/u_Materials/Electronic_Properties/Band_Theory_of_Semiconductors</ref>]]

<onlyinclude>The '''conduction band''' is the band of electron [[orbital]]s that electrons can jump up into from the [[valence band]] when excited. When the electrons are in these orbitals, they have enough [[energy]] to move freely in the material. This movement of electrons creates a [[current]].</onlyinclude> The valence band is simply the outermost electron orbital of an atom of any specific material that electrons actually occupy. The energy difference between the highest occupied energy state of the valence band and the lowest unoccupied state of the conduction band is called the band gap and is indicative of the [[conductivity]] of a material.<ref>''Introduction to Energy Bands'' [Online]. Available:http://www.doitpoms.ac.uk/tlplib/semiconductors/energy_band_intro.php</ref> A large band gap means that a lot of energy is required to excite [[valence electron]]s to the conduction band. Conversely, when the valence band and conduction band overlap as they do in [[metal]]s, electrons can readily jump between the two bands (see Figure 1) meaning the material is highly conductive.<ref name = a>Hyperphysics. (August 14, 2015). ''Conductor Energy Bands'' [Online]. Available:http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html#c6</ref>

[[Insulator]]s are characterized by a large band gap, so a prohibitively large amount of energy is required to move electrons into the conduction band to form a current.<ref>Hyperphysics. (August 14, 2015). ''Insulator Energy Bands'' [Online]. Available: http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html#c4</ref> [[Conductor]]s have an overlap between the conduction and valence bands, so the valence electrons in such conductors are essentially free.<ref name = a></ref> [[Semiconductor]]s, on the other hand, have a small band gap that allows for a meaningful fraction of the valence electrons of the material to move into the conduction band given a certain amount of energy. This property gives them a conductivity between conductors and insulators, which is part of the reason why they are ideal for [[circuit]]s as they will not cause a [[short circuit]] like a conductor.<ref name = b></ref> This band gap also allows semiconductors to convert [[light]] into [[electricity]] in [[photovoltaic cell]]s and to emit light as [[LED]]s when made into certain types of [[diode]]s. Both these processes rely on the energy absorbed or released by electrons moving between the conduction and valence bands.

==References==
{{reflist}}[[Category:Uploaded]]