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• W1551041415 abstract "Ultrathin 2.5nm high-k aluminum oxide (Al2O3) films on p-type silicon (001) deposited by atomic layer deposition (ALD) were investigated with noncontact atomic force microscopy (NC-AFM) in ultrahigh vacuum, using a conductive tip. Constant force gradient images revealed the presence of oxide charges and experimental observations at different tip–sample potentials were compared with calculations of the electric force gradient based on a spherical tip model. This model could be substantially improved by the incorporation of the image of the tip in the semiconductor substrate. Based on the signals of different oxide charges observed, a homogenous depth distribution of those charges was derived. Application of a potential difference between sample and tip was found to result in a net electric force depending on the contact potential difference (CPD) and effective tip–sample capacitance, which depends on the depletion or accumulation layer that is induced by the bias voltage. CPD images could be constructed from height–voltage spectra with active feedback. Apart from oxide charges large-scale (150–300nm lateral size) and small-scale (50–100nm) CPD fluctuations were observed, the latter showing a high degree of correlation with topography features. This correlation might be a result from the surface-inhibited growth mode of the investigated layers." @default.
• W1551041415 created "2016-06-24" @default.
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• W1551041415 date "2005-03-14" @default.
• W1551041415 modified "2023-10-12" @default.
• W1551041415 title "Imaging of oxide charges and contact potential difference fluctuations in atomic layer deposited Al2O3 on Si" @default.
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• W1551041415 doi "https://doi.org/10.1063/1.1870113" @default.
• W1551041415 hasPublicationYear "2005" @default.
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