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- Band_bending abstract "Band bending refers to the local changes in the energy offset of a semiconductor's band structure near a junction, due to space charge effects. Because the common way to visualize the electron energy states and Fermi level in a material is to draw bands on an energy vs. distance plot (band diagram), band bending refers to bending observed in these diagrams and does not correspond to any physical (spatial) bending.The primary principle underlying band bending inside a semiconductor is space charge: a local imbalance in charge neutrality. Poisson's equation gives a curvature to the bands wherever there is an imbalance in charge neutrality.Why is there charge imbalance? Although one expects a homogeneous material to be charge neutral everywhere (since it must be charge neutral on average) there is no such requirement for interfaces.Practically all types of interface develop a charge imbalance, though for different reasons: At the junction of two different types of the same semiconductor (e.g., p-n junction) the bands vary continuously since the dopants are sparsely distributed and only perturb the system. At the junction of two different semiconductors there is a sharp shift in band energies from one material to the other; the band alignment at the junction (e.g., the difference in conduction band energies) is fixed. At the junction of a semiconductor and metal, the bands of the semiconductor are pinned to the metal's Fermi level. At the junction of a conductor and vacuum, the vacuum level (from vacuum electrostatic potential) is set by the material's work function and Fermi level. This also (usually) applies for the junction of a conductor to an insulator.Knowing how bands will bend when two different types of materials are brought in contact is key to understanding whether the junction will be rectifying (Schottky) or ohmic. The degree of band bending depends on the relative Fermi levels and carrier concentrations of the materials forming the junction. In the p-type semiconductor the band bends upward, while in n-type the band bends downward. Note that band bending is due neither to magnetic field nor temperature gradient. Rather, it only arises in conjunction with the force of the electric field.".
- Band_bending wikiPageID "2764522".
- Band_bending wikiPageLength "3255".
- Band_bending wikiPageOutDegree "24".
- Band_bending wikiPageRevisionID "705609199".
- Band_bending wikiPageWikiLink Andersons_rule.
- Band_bending wikiPageWikiLink Band_diagram.
- Band_bending wikiPageWikiLink Category:Electronic_band_structures.
- Band_bending wikiPageWikiLink Category:Semiconductor_structures.
- Band_bending wikiPageWikiLink Electronic_band_structure.
- Band_bending wikiPageWikiLink Energy_level.
- Band_bending wikiPageWikiLink Fermi_level.
- Band_bending wikiPageWikiLink Field_effect_(semiconductor).
- Band_bending wikiPageWikiLink Heterojunction.
- Band_bending wikiPageWikiLink Metal–semiconductor_junction.
- Band_bending wikiPageWikiLink Ohmic_contact.
- Band_bending wikiPageWikiLink Poissons_equation.
- Band_bending wikiPageWikiLink P–n_junction.
- Band_bending wikiPageWikiLink Quantum_capacitance.
- Band_bending wikiPageWikiLink Rectifier.
- Band_bending wikiPageWikiLink Space_charge.
- Band_bending wikiPageWikiLink Thomas–Fermi_screening.
- Band_bending wikiPageWikiLink Two-dimensional_electron_gas.
- Band_bending wikiPageWikiLink Walter_H._Schottky.
- Band_bending wikiPageWikiLink Work_function.
- Band_bending wikiPageWikiLinkText "''band-bending diagram''".
- Band_bending wikiPageWikiLinkText "Band bending".
- Band_bending wikiPageWikiLinkText "band bending".
- Band_bending wikiPageWikiLinkText "band-bending".
- Band_bending wikiPageWikiLinkText "bending of the band energies".
- Band_bending subject Category:Electronic_band_structures.
- Band_bending subject Category:Semiconductor_structures.
- Band_bending type Physic.
- Band_bending type Redirect.
- Band_bending type Semiconductor.
- Band_bending type Structure.
- Band_bending comment "Band bending refers to the local changes in the energy offset of a semiconductor's band structure near a junction, due to space charge effects. Because the common way to visualize the electron energy states and Fermi level in a material is to draw bands on an energy vs.".
- Band_bending label "Band bending".
- Band_bending sameAs Q4854231.
- Band_bending sameAs m.081bbk.
- Band_bending sameAs Q4854231.
- Band_bending wasDerivedFrom Band_bending?oldid=705609199.
- Band_bending isPrimaryTopicOf Band_bending.