VIBRATIONAL ABSORPTION OF CARBON AND CARBON-OXYGEN COMPLEXES IN SILICON

被引:93
作者
NEWMAN, RC
SMITH, RS
机构
[1] J.J. Thomson Physical Laboratory, University of Reading, Berks. England
关键词
D O I
10.1016/0022-3697(69)90211-X
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Vibrational absorption of isolated carbon and carbon-oxygen complexes has been studied in silicon containing various carbon isotopes. The energies of the isolated carbon fundamentals and second harmonics have been determined at 290° and 77°K and compared with the corresponding results for boron. The strength of the local mode absorption has been remeasured and the high value of η0 ≅ 2.5e has been confirmed. A search has been made for band mode absorption due to carbon with essentially negative results; this fits in with current theoretical ideas on long range impurity induced polarization effects in silicon. Satellite lines near the carbon fundamental at 588, 640 and 690cm-1 for 12C and corresponding lines for 13C and 14C have been correlated in strength with satellite lines at 1104 and 1052cm-1. The latter lines show no splitting or broadening at 4.2°K when different carbon isotopes are present and it is concluded that they are due to vibrations of oxygen in a centre where the rotational motion is quenched. Detailed models of possible C-O pair structures are discussed and compared with isolated oxygen and Li-O centres. It is concluded that the carbon atom in the pair probably occupies a second or third neighbour site to the interstitial oxygen. © 1969.
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页码:1493 / &
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