Abstract
The chemical bonds established on GaAs(001) by wet nitridation in hydrazine solutions containing 0.01 M of sodium sulfide are investigated using in-situ IR absorption spectroscopy. Hydrazine distillation is found to be necessary in order to avoid numerous carbon-related features in the spectra. The absorption spectrum consists of positive lines due to adsorbed hydrazine molecules and of negative lines due to water being removed from the surface. Well-defined structures near 960 cm−1 and 1020 cm−1 as well as a broader line near 1008 cm−1, not present in the absorption spectrum of the solution, also appear. Investigation of isotopic effects, of the effect of plasma nitridation and of the kinetics of the various lines suggests that hydrazine bonding first occurs to surface Ga atoms in a singly-bonded (Ga-NH-NH2) and doubly-bonded GaGa > N − NH2 end-on configuration. At a later stage, dissociative interaction between chemisorbed hydrazine molecules forms the GaGa > NH configuration.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
