Raman spectra of As4S4 polymorphs: Structural implications for amorphous As2S3 films |
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Authors: | M.L. Slade R. Zallen |
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Affiliation: | Xerox Webster Research Center, Webster, NY 14580, USA |
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Abstract: | Raman-scattering spectra of α-As4S4 and β-As4S4 have been determined at 300 and 10 K. Although similar in overall aspect, the spectral signatures of the two polymorphs are clearly distinct. We have made a careful comparison of these first-order crystal line spectra to the sharp features reported in the Raman spectra of freshly-deposited films of amorphous As2S3. Prior proposals for the presence of As4S4 molecules in the unannealed films are supported by these comparisons, but recent contentions that actual microcrystals of β-As4S4 are present in the as-deposited material are clearly contradicted by the absence of any of the lattice-phonon lines which are prominent in the crystals at frequencies below 70 cm-1. |
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