energy gapn.

Brit.

/ˈɛnədʒɪ ɡap/, U.S.

/ˈɛnərdʒi ˌɡæp/

Origin: Formed within English, by compounding. Etymons: energy n., gap n.¹

Etymology: < energy n. + gap n.¹

1. Physics. A gap between adjacent energy bands in a solid, being a range of energy levels which electrons in that solid cannot occupy; esp. the gap between the valence band and the conduction band in an insulator or semiconductor; = band gap n. at band n.² Additions.Cf. energy band n. at energy n. Compounds 4.

ΘΚΠ

the world > matter > physics > solid state physics > semiconductivity > [noun] > energy band or gap

energy gap1933

impurity level1933

conduction band1939

valence band1956

1933 Proc. Royal Soc. A. 140 508 ΔW₁ is the width of the energy gap separating bands 1 and 2.

1959 R. A. Smith Semiconductors i. 16 If the forbidden energy gap ΔE between the highest filled band and the next empty band is large, no electronic conduction can take place.

1978 H. M. Rosenberg Solid State (ed. 2) viii. 131 If the energy gap is not too large, say 1 eV or less, a few electrons can be excited across the gap at room temperature and so a small current can flow... This is the behaviour typical of a semiconductor.

2009 S. Blundell Superconductivity: Very Short Introd. v. 58 One of the big differences between metals and insulators is the presence of an energy gap in the latter class of material.

2. A shortfall between the amount of energy that a country, region, etc., can produce and the energy requirements of its population; an instance of this.

ΘΚΠ

society > occupation and work > materials > fuel > [noun] > shortage of

energy crisis1953

energy gap1956

energy crunch1970

1956 Financial Times 26 Jan. 1/4 It is to the country's..advantage to import oil to fill as much of the energy gap as possible.

1977 Undercurrents June 8/1 Although North Sea oil and gas will make energy growth in Britain feasible during the 1980s, by the 1990s these reserves will be running out and we'll be faced with an ‘energy gap’.

2010 D. Stokes & S. Raphael Global Energy Security & Amer. Hegemony i. 42 Static levels of domestic production will cause the resulting energy gap to grow massively.

This entry has been updated (OED Third Edition, June 2018; most recently modified version published online March 2022).

单词	energy gap
释义	energy gapn. Brit. /ˈɛnədʒɪ ɡap/, U.S. /ˈɛnərdʒi ˌɡæp/ Origin: Formed within English, by compounding. Etymons: energy n., gap n.¹ Etymology: < energy n. + gap n.¹ 1. Physics. A gap between adjacent energy bands in a solid, being a range of energy levels which electrons in that solid cannot occupy; esp. the gap between the valence band and the conduction band in an insulator or semiconductor; = band gap n. at band n.² Additions.Cf. energy band n. at energy n. Compounds 4. ΘΚΠ the world > matter > physics > solid state physics > semiconductivity > [noun] > energy band or gap energy gap1933 impurity level1933 conduction band1939 valence band1956 1933 Proc. Royal Soc. A. 140 508 ΔW₁ is the width of the energy gap separating bands 1 and 2. 1959 R. A. Smith Semiconductors i. 16 If the forbidden energy gap ΔE between the highest filled band and the next empty band is large, no electronic conduction can take place. 1978 H. M. Rosenberg Solid State (ed. 2) viii. 131 If the energy gap is not too large, say 1 eV or less, a few electrons can be excited across the gap at room temperature and so a small current can flow... This is the behaviour typical of a semiconductor. 2009 S. Blundell Superconductivity: Very Short Introd. v. 58 One of the big differences between metals and insulators is the presence of an energy gap in the latter class of material. 2. A shortfall between the amount of energy that a country, region, etc., can produce and the energy requirements of its population; an instance of this. ΘΚΠ society > occupation and work > materials > fuel > [noun] > shortage of energy crisis1953 energy gap1956 energy crunch1970 1956 Financial Times 26 Jan. 1/4 It is to the country's..advantage to import oil to fill as much of the energy gap as possible. 1977 Undercurrents June 8/1 Although North Sea oil and gas will make energy growth in Britain feasible during the 1980s, by the 1990s these reserves will be running out and we'll be faced with an ‘energy gap’. 2010 D. Stokes & S. Raphael Global Energy Security & Amer. Hegemony i. 42 Static levels of domestic production will cause the resulting energy gap to grow massively. This entry has been updated (OED Third Edition, June 2018; most recently modified version published online March 2022). < n.1933
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