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- W2014373911 abstract "The mechanism of platinum (Pt)-enhanced oxidation of Si below 300 °C has been investigated by means of high-resolution x-ray photoelectron spectroscopy. When a Pt layer is deposited on the ∼1-nm-thick silicon oxide-covered Si, low-temperature heat treatment grows the silicon oxide layer between the Pt layer and the Si substrate, while silicon oxide is formed mainly on the Pt layer in cases where Pt is directly deposited on the Si substrate. Oxidation is enhanced by the application of a positive bias voltage to the Si substrate with respect to the Pt layer during the heat treatment of the specimens with 〈∼4 nm Pt/silicon oxide/Si(100)〉 structure in oxygen, and in this case, a ∼8-nm-thick oxide layer is formed at 300 °C for 2 h. It demonstrates that oxygen ions are the moving species in the oxide layer. The plots of oxide thickness with respect to oxidation time are linear in the oxide thickness region below 3∼4 nm, indicating that the reaction at the interface is the rate-determining step. The activation energy for the interfacial reaction is estimated to be ∼0.55 eV: much lower than that for oxidation through reaction with oxygen molecules of ∼2 eV. The plots for the subsequent oxidation stage are expressed by logarithmic functions, showing that the migration of oxygen ions in the oxide layer is the rate-limiting process." @default.
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- W2014373911 date "1998-09-22" @default.
- W2014373911 modified "2023-09-24" @default.
- W2014373911 title "Mechanism of platinum-enhanced oxidation of silicon at low temperatures" @default.
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- W2014373911 doi "https://doi.org/10.1063/1.477112" @default.
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