Molecular models and activation energies for bonding rearrangement in plasma-deposited alpha-SiNx : H dielectric thin films treated by rapid thermal annealing



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Mártil de la Plaza, Ignacio and González Díaz, Germán and Prado Millán, Álvaro del (2001) Molecular models and activation energies for bonding rearrangement in plasma-deposited alpha-SiNx : H dielectric thin films treated by rapid thermal annealing. Physical review B, 63 (24). ISSN 0163-1829

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Hydrogen and nitrogen release processes in amorphous silicon nitride dielectrics have been studied by MeV ion scattering spectrometry in combination with infrared spectroscopy. The outdiffusion of those light constituents was activated by the thermal energy supplied to the samples by rapid thermal annealing treatments. Molecular models of how these reactions proceed have been proposed based on the information obtained from the infrared spectra, and the validity of the models has been tested by an analysis of the activation energy of the desorption processes. For this purpose, the evolution of the hydrogen concentration versus the annealing temperature was fitted to an Arrhenius-type law obtained from a second-order kinetics formulation of the reactions that are described by the proposed structural models. It was found that the low values of the activation, energies can be consistently explained by the formation of hydrogen bonding interactions between Si-H or N-H groups and nearby doubly occupied nitrogen orbitals. This electrostatic interaction debilitates the Si-H or N-H bond and favors the release of hydrogen. The detailed mechanism of this process and the temperature range in which it takes place depend on the amount and the proportion of hydrogen in SI-H and N-H bonds. Samples with higher nitrogen content, in which all bonded hydrogen is in the form of N-H bonds, are more stable upon annealing than samples in which both Si-H and N-H bonds are detected. in those nitrogen-rich films only a loss of hydrogen is detected at the highest annealing temperatures.

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© 2001 The American Physical Society. We wish to thank the financial support of the Spanish National Office for Science and Technology under grant TIC98/0740 and the technical assistance received from the ion implantation facility “CAI—Implantación Iónica” of the University of Madrid. Dr. E. Martínez from the Department of Chemistry of the University of Murcia is thanked for valuable comments and suggestions.

Uncontrolled Keywords:Electron-Cyclotron-Resonance, Cehmical-Vapor-Deposition, Silicon-Nitride Films. Insulator-Semiconductor Structures, Amorphous Hydrogenated Silicon, Gate Dielectrics, Infrared-Spectroscopy, Crystalline Silicon, Si-SiO2 Interfaces, Optical-Properties.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:26270
Deposited On:14 Jul 2014 08:44
Last Modified:10 Dec 2018 14:58

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