Charge transfer controlled surface interactions between oxygen and CdSe films
IBM1
TL;DR: In this paper, the interaction of oxygen with CdSe surfaces has been studied with thin films of cdSe evaporated in ultra high vacuum in the temperature range 0-360°C and pressure range 10−4−10mm Hg.
About: This article is published in Journal of Physics and Chemistry of Solids.The article was published on 1963-02-01. It has received 71 citations till now. The article focuses on the topics: Oxygen & Chemisorption.
Citations
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TL;DR: The state of the art of transparent, electrically conducting films, with special reference to In2O3, SnO2 and Cd2SnO4, has been reviewed in this paper.
Abstract: The present state of the art of transparent, electrically conducting films, with special reference to In2O3, SnO2 and Cd2SnO4, has been reviewed. Various production techniques currently in use, and typical parameters used in the processes have been discussed in detail. Electrical and optical properties of these films have been reported as a function of various parameters, e.g. substrate temperature, doping, oxygen pressure, etc. Finally, the applications of these films in research and industry have been discussed in detail.
385 citations
TL;DR: In this paper, a photo-induced chemisorption process was proposed for photoconductive gain and response time in insulating CdS crystals, where the sensitivity of red sensitive crystals is attributed to the migration of excitation energy away from the illuminated surface by reabsorption in the bulk of the luminescence produced in the surface region.
57 citations
TL;DR: In the early 1960s, surface science has uncovered the atomic and electronic structures of surfaces and the nature of chemical bonding of adsorbed monolayers of atoms and molecules as mentioned in this paper.
Abstract: Since the early 1960s, surface science has uncovered the atomic and electronic structures of surfaces and the nature of chemical bonding of adsorbed monolayers of atoms and molecules. Surface instr...
53 citations
TL;DR: In this article, surface electronic features can be related to chemical contamination, Ar+ bombardment-induced lattice defects, or bulk trap states, which are attributed to different bonding at surface vacancy sites.
53 citations
TL;DR: In this article, a comparison of measured conductivities with those computed from different surface state models (discrete or distributed), chosen a priori, reveals that the oxygen chemisorption states of natural surfaces of CdS (single crystals and evaporated films) are distributed in energy.
51 citations
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555 citations
TL;DR: In this paper, the boundary layer theory was applied to derive the form of relationships for the extent, heats, and rates of chemisorption and some consequences with respect to catalysis.
Abstract: When chemisorption on a semiconductive solid is accompanied by electronic charge transfer between adsorbate and solid, an electronic boundary layer analogous to that in rectifying junctions may develop and polarization of charges in the solid may result. These phenomena may limit or control the chemisorption characteristics. The boundary layer theory developed for electrical contacts and elementary considerations concerning the effect of the polarization potential are applied to derive the form of relationships for the extent, heats, and rates of chemisorption and some consequences with respect to catalysis. An attempt is made to illustrate the detailed physical processes in order to examine the meaning of ``heterogeneity'' and ``active centers'' in cases of this type of chemisorption.
238 citations
TL;DR: In this paper, the authors studied the photoconductive rise and decay curves of porous sintered zinc oxide as a function of time (0.3 to 107 sec), ambient oxygen pressure (5×10 −5 to 760 mm), temperature (110° to 373°K), incident light intensity (factor of 103), and various cycling procedures in regard to illumination.
Abstract: Photoconductive rise and decay curves of porous sintered zinc oxide are studied as a function of time (0.3 to 107 sec), ambient oxygen pressure (5×10—5 to 760 mm), temperature (110° to 373°K), incident light intensity (factor of 103), and various cycling procedures in regard to illumination. The photoconductivity is shown to be entirely due to the desorption of chemically adsorbed oxygen atoms from the surfaces of the porous sample. Light of wavelength near the fundamental absorption edge forms electron‐hole pairs of which the hole is captured by the oxygen, converting the oxygen to physically adsorbed. The physically adsorbed oxygen easily desorbs and the electron remains to increase the conductivity. The kinetics of the adsorption process when the light is removed are found to obey the Elovich equation, dq/dt=a exp(—bq), where q is the density of adsorbate, and a and b are constants. It is believed that the limiting process is electron transfer through the Schottky barrier, since it results in an equati...
204 citations