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- W2096746102 abstract "Im Zusammenhang mit der Entwicklung neuer photoelektrischer Energiewandler wurden in jüngster Zeit elektrochemische Systeme mit anorganischen Halbleiterelektroden eingehend untersucht. Die vorliegende Arbeit zieht organische Photoleiter in diese Untersuchungen mit ein - Die Versuche ergaben, daß mit organischen Photoleitern vom n-Leitungstyp (Kristallviolett, Pinacyanol u.a.) und p-Leitungstyp (Merocyanin, Vanadyl-Phthalocyanin u.a.) beim Vorhandensein geeigneter Elektronendonatoren bzw. -akzeptoren Photospannungen bis 0,8 V und anodische bzw. kathodische Photoströme bis 0,3 mA/cm2 in photogalvanischen Zellen erhalten werden können. Die auf das Spektrum einer Xenon-Lampe bezogene Ausbeute reicht von 0,1 - 0,2%. Die Effekte können analog zu anorganischen Photoelektroden durch Aufbau einer Raumladungszone an der Halbleiter/Elektrolytgrenzschicht sowie durch einen elektrochemischen Ausgleich der Minoritätsträger des Photoleiters durch im Elektrolyten gelöste reduzierende bzw. oxidierende Zusätze erklärt werden. - Ein photoelektrochemisches Modell des Primärprozesses der Photosynthese wird zur Diskussion gestellt. For the development of new photoelectric solar energy converters photoelectrochemical cells using inorganic semiconductors as electrodes have been tested since a few years. In this paper the results obtained with organic semiconductors as photoactive electrodes are reported. - It is shown that with the help of an n-type photoconductor (crystal violet, pinacyanol et al.) or a p-type photoconductor (vanadyl phthalo-cyanine merocyanine et al.) immersed into an electrolyte solution containing reducing or oxidizing agents photovoltages and anodic or cathodic photocurrents have been observed up to 0,8 Volt and 0,3 mA/cm2, respectively, during illumination. An energy conversion in the order of 0.1 to 0.2% referred to the spectrum of a Xenon lamp has been obtained. The photoinduced potentials and photocurrents can be explained similarly to inorganic semiconductor photogalvanic cells by the separation of photogenerated hole-electron pairs in a space-charge layer at the electrolyte/organic semiconductor interface combined with an electrochemical charge exchange which includes minority carriers of the photoconductor and reducing or oxidizing agents of the electrolyte. The results point to the possibility of discussing a photo-electrochemical model of the photosynthetic primary process occuring in green plants by using anodic and cathodic working chlorophyll centers." @default.
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- W2096746102 title "Zum photovoltaischen Effekt am System Organischer Halbleiter/Elektrolyt" @default.
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