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• W2159251018 abstract "The problem of the rapid anodical photoelectrochemical desintegration of visible-light-sensitive semiconductor electrodes (e.g. CdS, GaAs) in presently investigated continuously operating electrochemical solar cells is tackled by two improvements: a) The use of covalent layer-type transition metal dichalcogenides as electrode material, in which photon absorption involves d-d transitions and does not produce a splitting of chemical bonds and b) the operation of the transition metal dichalcogenides as photo-cathodes, which is possible with p-conducting material. The first photocell of this kind is constructed with p-conducting natural MoS2 layer crystals and Fe2+/3+ as redox-couple. It proved to be stable during longtime experiments. A power output of up to 1% was obtained. The limiting factor was found to be the insufficient solid state behaviour of the available natural crystals (high recombination losses through traps, weak p-character). A considerable improvement is to be expected from better quality p-type electrode-material. Some development possibilities for solar cells, based on covalent semiconducting layer-type transition metal dichalcogenides are outlined. Das Problem der raschen anodischen photoelektrochemischen Korrosion von Halbleiterelektroden, die für sichtbares Licht empfindlich sind (CdS, GaAs), in gegenwärtig untersuchten kontinuierlich arbeitenden elektrochemischen Solarzellen, wird durch zwei Verbesserungen in Angriff genommen. a) Die Verwendung von kovalenten Schichtgitter-Übergangsmetalldichalkogenidena ls Elektrodenmaterial, in denen die Absorption von Photonen d-d-Übergänge auslöst und nicht zu einer Brechung chemischer Bindungen führt. b) Die Benutzung der Übergangsmetalldichalkogenide als Photokathoden, was bei Verwendung von p-leitendem Material möglich ist. Die erste Photozelle dieser Art wird mit p-leitenden natürlichen MoS,-Schichtgitterkristallen und Fe2+/3+ als Redox-Paar hergestellt. Sie erweist sich hei Langzeitexperimenten als stabil. Eine Energieausbeute bis zu 1% wurde erzielt. Als begrenzender Faktor wurde das unzureichende Festkbrperverhalten der zur Verfügung stehenden natürlichen Kristalle (hohe Rekombinationsverluste durch Traps, schwacher p-Charakter) ermittelt. Eine beträchtliche Verbesserung ist von optimalerem p-leitenden Elektrodenmaterial zu erwarten. Einige Entwicklungsmöglichkeiten für Solarzellen, die mit kovalenten Schichtgitter-Übergangsmetalldichalkogeniden funktionieren. werden skizziert." @default.
• W2159251018 created "2016-06-24" @default.
• W2159251018 creator A5073942054 @default.
• W2159251018 date "1977-04-01" @default.
• W2159251018 modified "2023-10-12" @default.
• W2159251018 title "Layer-Type Transition Metal Dichalcogenides - a New Class of Electrodes for Electrochemical Solar Cells" @default.
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• W2159251018 doi "https://doi.org/10.1002/bbpc.19770810403" @default.
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