Analysis of hydrogen and paramagnetic defects in aSi: H aerosol particles. Resulting from thermal decomposition of silane

Abstract

Abstract Hydrogen and paramagnetic centers contained in aSi:H aerosol particles, formed during thermal decomposition of silane are studied. The methods of IR spectroscopy, effusion of hydrogen, and ESR spectroscopy are used. For low temperatures of aerosol formation (T ≦ 833 K) paramagnetic centers with g ∼ 2.0051 are recorded in aerosol particles. For high temperatures (T > 880 K) paramagnetic centers with g ∼ 2.0055 are recorded. The obtained experimental results testify that the existence of paramagnetic centers with g ∼ 2.0051 is related to the presence of polysilane chains. The existence of paramagnetic centers with g ∼ 2.0055 is related to the presence of monohydride groups with the frequency of stretching vibrations near 2100cm −1 located on the surface of interconnected microvoids and microchannels. The quantitative relations between the fractions of hydrogen present in various structural groups and IR absorptions in the corresponding regions of the IR spectra are obtained.