On the theory of photoadsorption kinetics of a-Se colloids: A simple model for the kinetic parameters

Peled, A.; Perakh, M.

doi:10.1016/0021-9797(88)90302-5

Cited by 8 publications

(5 citation statements)

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“…[2], we have shown that 1/x can be recognized as the optical absorption constant of solid a-Se, hence defining the maximum film thickness which may be obtained by the photoadsorption effect due to self-absorption of light in the growing layer, r* on the other hand, was found to be the fundamental kinetic parameter which includes all the physical dependences such as light excitation, diffusion constant and adsorption conditions at the substrate. Another basic parameter discussed in the former paper was the positiondependent potential energy U(x).…”

Section: =7~mentioning

confidence: 97%

“…)exp (-~ L) expt-~(t--))particles/cm2 .s (2) where r is the thickness-time experimental dependence, f the conversion factor given in colloid particles per unit volume of the film, x, rl, ~1, "F* parameters obtained from least-squares numerical fitting of g(t)…”

Section: Experimental Kinetics Of Spmentioning

confidence: 99%

“…(5) and additionally incorporate the adsorption efficiency parameter to account for the processes occurring near the substrate/hydrosol interface. We will assume that the adsorption occurs by diffusion of noninteracting particles through a repulsive energy barrier U(x) acting at an effective distance Xeff [2]. Let us introduce explicitly the adsorption coefficient or adsorption efficiency parameter 0:…”

Section: The Physical Modelmentioning

confidence: 99%

“…1). A theoretical treatment of the VP and SP processes was given recently [1,2] and the phenomenological models developed there were used to evaluate several physical parameters which describe the processes. In this paper, we use a more elaborate model to include results obtained from thermal activation measurements.…”

Section: Introductionmentioning

confidence: 99%

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On the theory of photoadsorption kinetics of a-Se colloids: The thermal activation energy and compensation effect

Peled

Naot

Perakh

1988

Colloid & Polymer Sci

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Abstract:In this study, a model is developed to explain in microscopic terms the results obtained from thermally activated photoadsorption experiments in a-Se colloids. The observed compensation effect can be described for two different cases. At low efficiency adsorption, the process is controlled by the potential at the boundary layer. In the high efficiency adsorption case, the process is controlled by diffusion transport.

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Section: =7~mentioning

confidence: 97%

Section: Experimental Kinetics Of Spmentioning

confidence: 99%

Section: The Physical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the theory of photoadsorption kinetics of a-Se colloids: The thermal activation energy and compensation effect

Peled

Naot

Perakh

1988

Colloid & Polymer Sci

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“…electrical charging mechanism of the photoactivation is still uncertain. 8 We observe that the basic photoadsorption process occurs both as a coagulating effect in the bulk of the colloid solution and as deposition on the surface of the foreign substrate. The photocoagulation effect occurring in the bulk of the colloid solution is termed volume photodeposition5 (VP); its potential uses as an imaging process were described in a previous publication.…”

Section: Introductionmentioning

confidence: 96%

Optical Photorecording By The Surface Photodeposition Effect

Peled

Dror

1988

Opt. Eng

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The basic properties of the surface photodeposition effect are described. The process can be used as an imaging and optical recording method realizable with various light sources such as laser, discharge, or even conventional incandescent white light sources. Since the photoprocess is controlled by the dose of light delivered to the photosystem, films of required thicknesses can be obtained in the range 50 to 2000 nm. This makes possible the preparation of various optical devices such as coatings, filters, phase retardation plates, holograms, gratings, and optical patterns for recording data. The optical resolution and contrast were tested by projection and mask contact methods. With both methods, the recorded linewidth resolution of the imaged patterns was about 1000 nm. This figure, however, was the basic resolution of the optical projection system or that of the original mask used for imaging.Theoretical arguments lead us to assume that the effect can provide better resolution due to its special feature of a one -step photographic process involving adsorption on a flat surface without a scattering emulsion on it.

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