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- W2067659969 abstract "Silicon containing 1019 atom cm−3 of aluminium has been compensated by (a) lithium diffusion and (b) irradiation by 1.5 MeV electrons. The one phonon band mode absorption has been measured in both types of sample which contain Al−(s)-Li+(i) and Al−(s)-Al2+(i) pair defects respectively; the latter centre has been identified by EPR measurements. In the lithium compensated sample in-band resonances were observed at 520 cm−1 due to Li and at 469 cm−1 and 431 cm−1 due to the paired Al−(s). A resonant mode at 242 cm−1 has been ascribed to the vibrations of Al2+(i) in the irradiated sample and this is compared in detail with the similar lithium mode. This sample also showed marked absorption features characteristic of the critical point structure of the silicon density of states. These measurements are compared with neutron scattering data and previously measured one phonon absorption. The initial removal rate of Al−(s) by the irradiation as determined from resistivity measurements had the very high value of 2 atom per electron -cm. Interesting surface effects were also observed in these measurements and related to the diffusion of defects; the activation energy of diffusion of Al2+(i) has been estimated to be about 1.2 eV. These results give further information about the products of the electron irradiation damage process, and also about the one phonon absorption associated with vacancy and interstitial impurity complexes." @default.
- W2067659969 created "2016-06-24" @default.
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- W2067659969 date "1970-04-01" @default.
- W2067659969 modified "2023-10-03" @default.
- W2067659969 title "One phonon absorption from aluminium complexes in silicon compensated by lithium or electron irradiation" @default.
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- W2067659969 doi "https://doi.org/10.1016/0022-3697(70)90202-7" @default.
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