Mechanism of charge transfer

Bockris, J. O M. The Mechanism of Charge Transfer from Metal Electrodes to Ions in Solution 6... 

The photovoltage is esentially determined by the ratio of the photo- and saturation current. Since io oomrs as a pre-exponential factor in Eq. 1 it determines also the dark current. Actually this is the main reason that it limits the photovoltage via Eq. 2, The value of io depends on the mechanism of charge transfer at the interface under forward bias and is normally different for a pn-junction and a metal-semiconductor contact. In the first case electrons are injected into the p-region and holes into the n-region. These minority carriers recombine somewhere in the bulk as illustrated in Fig. 1 c. In such a minority carrier device the forward current is essentially determined... 

In order to interpret correctly the results of electrophysical measurements conducted on vacuum - sintered ZnO semiconductor films one should answer the question concerning the origin of contacts between specific crystallites controlling the electric conductivity of the material. This was accomplished in paper [37] using the method of prerelaxation VAC to run a comparative analysis of mechanisms of charge transfer in thin sintered (in vacuum) films and pressed polycrystalline ZnO samples. 

Tunneling as a mechanism of charge transfer in DNA has received widespread attention (see, for example. Refs. 117 and 132). Recently, definitive proof that tunneling in DNA occurs has been reported by Sevilla et al. [118-121,133]. Key to this proof is the demonstration that the observed rates of hole and electron transfer are independent of temperature from 4 to 130 K. We summarize their findings here. 

The current chapter discusses mechanisms of charge transfer reactions in double-stranded DNA (we will not deal with single-stranded DNA, or with individual bases or base-pair structures). We will also focus on interpretation of excess charge behavior in DNA molecules in terms of accepted theoretical models. 

The VCZ is a peculiar monomer which is very susceptible to charge transfer polymerization. The propagation mechanism of charge transfer polymerization has been the subject of discussion. 

This means that studies of the conductivity alone are insufficient to obtain a complete understanding of the mechanism of charge transfer. Other techniques such as photoconductivity, thermoelectric effect and mobility measurements are required for a deeper understanding of the phenomenon. 

In some specific instances the suggested mechanisms of charge transfer will need to be slightly modified. 

Thus, while some of the evidence presented is of use in determining the structural properties of the polymer much of it is of little value as far as elucidation of the mechanism of charge transfer or the nature of the charge carriers is concerned. 

Despite the volume of work which has appeared concerning the electrical properties of polymers and pyropolymers, the mechanism of charge transfer is much less well understood than that of organic mole-... 

One of the major questions that remains to be answered is the detailed mechanism of charge transfer. For redox couples which lie in the gap of the semiconductor, isoenergetic electron transfer would require the existence of an appropriate surface state. While such states have been postulated, little direct evidence of their existence is available. An alternate possibility is an inelastic (non-isoenergetic) electron transfer process such as is commonly observed in solid state dev ices.(18)... 

FIGURE 8.2 Mechanism of charge transfer between two materials due to contact and separation. 

The origin of solid electrification and the mechanism of charge transfer are elaborated on in 3.5. 

Mechanisms of Charge Transfer Through Molecular Wires... 

Tafalla, D. and Salvador, P. 1987. Mechanisms of charge transfer at the semiconductor-electrolyte interface oxygen electroreduction at naked and platinized n-Ti02 electrodes. Ber. Bunsenges. Phys. Chem., 91,475M79. 

Mechanism of Charge-Transfer Photochemistry of Contact Ion Pairs... 

The issue of stability of these phases was not answered in the early studies. Only after a large number of misfit compounds was synthesized and studied did it become apparent that the key factor for the stability of these phases is a mechanism of charge transfer between the Q and H sublattices. The Q-part plays the role of electron donor and the H-part that of acceptor, i i s xhis hypothesis was of course... 

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