| 单词 | extrinsic semiconductor |
| 释义 | > as lemmasextrinsic semiconductor b. spec. Such a material in which there is a narrow gap between permitted energy bands, so that the only current carriers are electrons thermally excited from the valence band into the conduction band ( intrinsic semiconductor: see intrinsic adj. 3e) or into intermediate energy levels provided by impurity ions ( extrinsic semiconductor). ΚΠ 1931 Proc. Royal Soc. A. 133 459 It is not possible to maintain that the difference between good and bad conductors is one of degree only... There is an essential difference between a semi-conductor, such as germanium, and a good conductor, such as silver, which must be accounted for by any theory which attempts to deal with semi-conductors. 1946 Electronic Engin. 18 66/2 It is well known that ‘semi-conductors’, such as carbon, silicon.., etc., possess negative temperature coefficients of resistance at ordinary temperatures. 1961 G. R. Choppin Exper. Nucl. Chem. iii. 41 The semiconductor detectors..are made from thin (approximately 1mm) wafers of semiconductor silicon. 1970 J. Shepherd et al. Higher Electr. Engin. (ed. 2) xx. 623 In an extrinsic or doped semiconductor, impurities are added to the intrinsic material to give a predominance of either electrons (in n-type material) or holes (in p-type material) as charge carriers. 1979 Jrnl. Royal Soc. Arts Oct. 692/2 Sometimes a significant advance in technology may itself create a new market, as did the advent of the semiconductors to the small ‘transistor radio’ market. < as lemmas |
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