Structural anisotropy in amorphous SnO2 film probed by X-ray absorption spectroscopy
نویسندگان
چکیده
Polarization-dependent X-ray absorption measurements reveal the existence of structural anisotropy in amorphous (a-) SnO2 film. The anisotropy is readily seen for the second neighbor interaction whose magnitude differs along three measured directions. The differences can be well accounted for by 10%–20% variation in the Debye-Waller factor. Instead of a single Gaussian distribution found in crystalline SnO2, the Sn-O bond distribution is bimodal in a-SnO2 whose separation shows a weak angular dependence. The oxygen vacancies, existing in the a-SnO2 film in the order of 10 cm , distribute preferentially along the film surface direction. VC 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4815984]
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