Effect of the hydrogen bonding and content on the opto-electronic properties of radiofrequency magnetron sputtered hydrogenated amorphous silicon films

Infrared absorption and optical transmission combined with photothermal deflection spectroscopy experiments have been used to study the effect of the hydrogen bonding and content on the opto-electronic properties of hydrogenated amorphous silicon (a-Si:H) films prepared by radiofrequency magnetron s...

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Bibliographic Details
Published in:Solid state communications 2001-10, Vol.120 (5), p.243-248
Main Authors: Daouahi, M, Ben Othmane, A, Zellama, K, Zeinert, A, Essamet, M, Bouchriha, H
Format: Article
Language:English
Subjects:
A. Disordered systems
A. Semiconductors
Amorphous semiconductors
Amorphous semiconductors, metallic glasses, glasses
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
D. Electronic states (localized)
D. Optical properties
Disordered solids
Electron states
Electronic structure of disordered solids
Exact sciences and technology
Infrared and raman spectra and scattering
Materials science
Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Physics
Specific materials
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Summary:Infrared absorption and optical transmission combined with photothermal deflection spectroscopy experiments have been used to study the effect of the hydrogen bonding and content on the opto-electronic properties of hydrogenated amorphous silicon (a-Si:H) films prepared by radiofrequency magnetron sputtering at high deposition rates (11–15 Å/s), at the same substrate temperature (250°C) and with different H 2 dilution percentage. The results indicate that the electronic properties, in terms of density of defects and disorder, are dependent on both the relative proportion of the isolated monohydride Si–H bonds and the presence in the films of structural inhomogeneities, while the optical gap is found to be rather controlled by the total bonded hydrogen content C H. Optimized films with quite low density of defects and disorder and which contain the highest proportion (∼38%) of isolated monohydride complexes are obtained. An increase in the proportion of the polyhydride and/or the clustered monohydride configurations gives rise to more gas states and disorder and favors the formation of higher structural inhomogeneities such as voids.
ISSN:0038-1098
1879-2766
DOI:10.1016/S0038-1098(01)00350-7