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bending of energy bands

Also contains definition of: flat bands

The distribution of potential in the space charge region of a semiconductor results in a change in the electron energy levels with distance from the interface. This is usually described as 'bending of the energy bands'. Thus the bands are bent, upwards if σ > 0 and downwards if σ < 0, where σ is the free charge density. When σ = 0 the condition of flat bands is met, provided no surface states are present.
Source:
PAC, 1986, 58, 437 (Interphases in systems of conducting phases (Recommendations 1985)) on page 443
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.B00629.
Original PDF version: http://www.iupac.org/goldbook/B00629.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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