55 research outputs found
Optical properties of hydrogenated amorphous silicon
A detailed study of the optical properties of sputtered hydrogenated amorphous silicon films with varying hydrogen concentration is presented here. The energy dependence of the absorption coefficient is looked into, in detail, from a point of view of understanding the well known Tauc rule and the alternate relations being proposed in recent years. Spectroscopic and bandâstructural models like Wemple-Didomenico and Penn are then utilized to analyze the optical parameters near the bandâgap region of the wavelength spectra. Extensive comparisons of our results are made with those of sputtered aâSi:H films of other workers, glow discharge prepared aâSi:H, chemically vapor deposited and evaporated aâSi, and also crystalline silicon. The similarities in the variation of the optical properties of aâSi:H with increasing hydrogen concentration (or decreasing measurement temperature) to that of crystalline silicon with decreasing measurement temperature lead us to interesting conclusions. Thus, it seems that decreasing disorder (topological or thermal) in aâSi:H is equivalent to decreasing thermal disorder in câSi, at least as far as the disorderâoptical property relationships are concerned
Virtual reality storytelling as a double-edged sword: Immersive presentation of nonfiction 360°-video is associated with impaired cognitive information processing
Influence of Growth Conditions on Amorphous Germanium Films Prepared by Vacuum-Evaporation
To Play or Not to Play: An Exploratory Content Analysis of Branded Entertainment in Facebook
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