ChemInform Abstract: INJECTION OF ELECTRONS INTO P‐CHLORANIL CRYSTALS VIA EXCITON DECAY AT METAL AND AQUEOUS ELECTRODES

Haberkorn, R.; Harengel, W.; Braun, Horst; Michel‐Beyerle, M. E.

doi:10.1002/chin.197408065

Cited by 4 publications

(4 citation statements)

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“…V'I = 0) was used, and we conclude that this additional term of reference (1) is in error. Thus we also disagree with the reinterpretation of our experimental results on chloranil crystals(6) in terms of the treatment of Singh and Baessler.…”

contrasting

confidence: 99%

On the one‐dimensional onsager theory for photoinjection

Haberkorn

Michel‐Beyerle

1975

Physica Status Solidi (b)

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contrasting

confidence: 99%

On the one‐dimensional onsager theory for photoinjection

Haberkorn

Michel‐Beyerle

1975

Physica Status Solidi (b)

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“…Such processes are most interesting in connection with photochemical problems and for characterizing the solid state properties of insulators, e.g. of molecular crystals [22,23,24,25]. However, they have only limited interest for electrochemical applications due to the large inner resistance of such an electrode.…”

Section: Insulatorsmentioning

confidence: 99%

Effects of Electronic Excitation on Reaction Rates at the Solid‐Electrolyte Interface

Gerischer

1975

Israel Journal of Chemistry

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One of the central problems of electrochemistry is the understanding of charge transfer reactions at the solid-electrolyte interface. In such reactions, electronic interactions are altered and chemical bonds are changed or modified. It is obvious that electronic excitation of the involved species which is usually obtained by light absorption will effect the reaction rate or even the reaction products. The excitation of electronic states, present at the interface between a solid and an electrolyte can effect electron transfer processes as welI as ion transfer steps. The efficiency depends on the lifetime of the excited states and on the rate of the reactions. Due to the high rate of electron transfer, such a process is much more frequently accelerated by electronic excitation than ion transfer. Examples are discussed for both cases with excitation at the interface either on the side of the solid (metals, semiconductors, or insulators) or of the electrolyte. In the solid, effects caused by excited electrons or excited holes can be distinguished. Excitation in the electrolyte serves as a model for a mechanism of spectral sensitization. The generation of photo-voltages at a semiconductor/electrolyte interface could possibly be used for energy conversion.

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“…el On the other hand, the dye coverage may hinder the direct access of oxygen molecules onto the very surface. Therefore, a pathway via triplet energy transfer from the crystal with a triplet energy of 2.39 eV [23] to the dye with E T~2 eV [24] give information about the relevant rate constants.…”

Section: 1 Reaction Schemementioning

confidence: 99%

Diffusion Limited Oxygen Quenching of Photo‐Induced Electrochemical Reactions in Sandwich Systems with Molecular Crystals

Killesreiter

1978

Ber Bunsenges Phys Chem

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Photoelectrochemical reactions in sandwich systems with the dye 3,3′‐distearyl‐oxacarbocyanine chlorate adsorbed in monolayer assemblies on p‐chloranil single crystals have been used to demonstrate the quenching action of paramagnetic oxygen on sensitized as well as on triplet exciton induced photocurrents. Simultaneously, the presented measurements are a method to study the lateral diffusion of oxygen into monolayer assemblies between the crystal surface and an evaporated aluminum electrode by photoelectrical detection. From the functional time dependence of a reciprocal square‐root law and together with the discussion of a kinetic scheme the rate constants for the quenching of excited dye molecules and of n‐π*‐triplet excitons at the phase boundary could be evaluated to be kq = 2.5 · 1012 M−1 s−1 and 3kq = 1012 M−1 s−1, respectively, on the basis of an estimated upper limit for the diffusion coefficient D = 4 · 10−6 cm2 s−1 for oxygen diffusion into the slab with a bilayer structure. – The method has been extended to sandwich systems with rhodamine B on the surface of anthracene and p‐chloranil crystals that showed no effect due to oxygen, whereas the systems cyanine dye/anthracene revealed less marked photocurrent enhancements as well as decreasings. These results are discussed in terms of hindered oxygen access and of an extended reaction scheme that involves the well‐known oxidizing action of oxygen in sensitization.

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ChemInform Abstract: INJECTION OF ELECTRONS INTO P‐CHLORANIL CRYSTALS VIA EXCITON DECAY AT METAL AND AQUEOUS ELECTRODES

Cited by 4 publications

References 1 publication

On the one‐dimensional onsager theory for photoinjection

On the one‐dimensional onsager theory for photoinjection

Effects of Electronic Excitation on Reaction Rates at the Solid‐Electrolyte Interface

Diffusion Limited Oxygen Quenching of Photo‐Induced Electrochemical Reactions in Sandwich Systems with Molecular Crystals

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