On the Influence of Sensitization of the Electron Transfer Through the Interface Zinc Oxide/Electrolyte by Salt Additions

Origin for the enhancement effect of hydroquinone (HQ), Fe2+, I−, Br−, and Cl− (cosensitizers) on the efficiency of electron injection from excited rhodamine B (RhB) to CdS has been investigated by combination of photoelectrochemical and heterogeneous photochemical measurements. The results indicate that the enhancement of RhB‐sensitized charge separation by HQ, Fe2+, and I− is due to reductive regeneration of the dye, while that by Br− and Cl− is mainly due to increased RhB adsorption at the CdS/aqueous solution interface.

Section: A Reductive Effectmentioning

confidence: 95%

“…AI. Photoreduction of D followed by electron injection from D- [4,6,7,9,19,241 ID* + CS -D; + CS+ D; -D + e&,.…”

Section: A Reductive Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reductive and Non‐Reductive Effects of Cosensitizers on the Rhodamine B‐Sensitized Charge Separation at CdS Surface

Watanabe

Takizawa

Honda

1981

Studies of Dye Photooxidation at Semiconductor Electrodes Using Attenuated Total Reflection Techniques

Spitler

Lübke

Gerischer

1979

The technique of attenuated total reflection spectroscopy has been introduced into the study of photooxidation of organic dyestuffs adsorbed at semiconductor electrodes. Using a ZnO electrode itself as the internal reflection element, an internally reflected laser beam served simultaneously as the actinic radiation and as a measuring beam to monitor the absorption of the adsorbed dye layer. Correlation of these data with the photocurrent produced by oxidation of the dye yielded a measure of the quantum efficiency, Φ, for photooxidation of the adsorbed dye. The dye‐semiconductor system rose bengal‐ZnO was studied to demonstrate the capabilities of this technique.

Charge Transfer across Organic Photoconductor/Insulating Liquid Interface. Part I: Metal Free Phthalocyanine/Alkanes

Ahuja

Häuffe

1980

Self Cite

In order to understand the decisive step in the photoelectrophoretic image formation i. e. the charge exchange between inert and photosensitive particles, we report in part I of a series of papers the charge transfer across metal free x-Phthalocyanine/Octane and Dodecane interfaces. The electron injection from the photoconductor into the organic liquid as a function of intensity and wavelength of light, and electric field has been studied using a transient measurement technique. It was found that oxygen is the most dominant species in alkanes which is responsible for the negative charge transfer from the photoconductor into the alkanes. The values of the interfacial charge transfer efficiency and quantum yield have been calculated from experimental data and were found to be in agreement with the previous results. The photoinjected charge follows the absorption spectrum of x-Phthalocyanine qualitatively and was found to be dependent on the electric field and the intensity of light. Um die fur die photoelektrophoretische Bilderzeugung maogebenden Schritte zu verstehen, die den Ladungsaustausch zwischen inerten und photoempfindlichen Teilchen in organischen Fliissigkeiten und deren Transport bewirken, wird im vorliegenden Teil I einer Veroffentlichungsreihe zunHchst iiber den Ladungsdurchtritt durch die Phasengrenze metallfreies x-Phthalocyanin/Octan bzw. Dodecan berichtet. Mittels einer Impuls-MeOtechnik durch eine Hochenergie-Blitzlichteinrichtung wurde die Injektion von Elektronen aus dem Photoleiter in die organische Fliissigkeit als Funktion der Intensitat und der Wellenlange des Lichtes sowie des elektrischen Feldes untersucht. Der in fliissigen Aliphaten stets vorhandene SauerstofT ist dabei als iiberwiegende Verunreinigung fur den Austritt yon Elektronen aus dem Photoleiter verantwortlich. Aus den MeOergebnissen konnten die Wirksamkeit des Ladungsdurchtritts durch die Phasengrenze und die Quantenausbeute berechnet werden. Der photoangeregte Ladungsaustritt aus x-Phthalocyanin folgte dem Absorptionsspektrum des Photoleiters qualitativ und war vom elektrischen Feld und der Lichtintensitlt abhangig.