Vibrational spectra of vapor-deposited binary phosphosilicate glasses |
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Authors: | J Wong |
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Institution: | General Electric Corporate Research and Development, Schenectady, New York 12301, USA |
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Abstract: | Room temperature infrared transmission spectra in the range 4000-250 cm?1 of binary phosphosilicate glass (PSG) films deposited by reacting argon- or nitrogen-diluted PH3SiH4O2 mixtures on heated silicon substrates at 300–400° C have been obtained across the whole composition range. In all the as-deposited binary films, an absorption at ≈1300 cm?1 characteristics of the P=O vibration was found to persist, together with a couple of broad absorptions in the regions 1200-900 cm?1 and 500 cm?1. Using a differential infrared technique the broad feature in the higher frequency region has been resolved into two well-defined bands at ≈1100 and 970 cm?1. A detailed analysis shows that the intensity variation of the differential band at ≈1100 cm?1 conforms well, at least to 50 mol% P2O5, to a simple structural model that yields an analytic distribution of POSi linkages as a function of composition by assuming chemical mixing in the vapor-deposited P2O5SiO2 system. Furthermore, the system may be written as (P=O)2 O3SiO2 in order to emphasize the similarity of its coordination scheme with that of the B2O3SiO2 system studied earlier. The nature of these CVD films has also been elucidated by thermal and water treatments. |
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