The influence of radical-anion electron density distribution on the dissociation efficiency of a bound electron-hole pair in carbazole-containing semiconductors

Kuvshinsky, N. G.; Давиденко, Н. А.; Reshetnyak, V. V.; Savransky, L.I.; Sheptun, V. L.

doi:10.1016/0009-2614(90)87196-x

Cited by 16 publications

(11 citation statements)

References 3 publications

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“…In the films of TNF doped PEPC the initial distance between charges r 0 is about ϳ10 Å. 3 This value is less than r c which was found in Ref. 7 as 13-15 Å.…”

Section: Discussionmentioning

confidence: 77%

Spin-dependent effects in charge carrier photogeneration in amorphous molecular semiconductor with charge transfer-complex centers

Давиденко

Kuvshinsky

1997

The Journal of Chemical Physics

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“…In the films of TNF doped PEPC the initial distance between charges r 0 is about ϳ10 Å. 3 This value is less than r c which was found in Ref. 7 as 13-15 Å.…”

Section: Discussionmentioning

confidence: 77%

Spin-dependent effects in charge carrier photogeneration in amorphous molecular semiconductor with charge transfer-complex centers

Давиденко

Kuvshinsky

1997

The Journal of Chemical Physics

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“…Note also that, since the electric charge in the colorless counterion of the ionic dye is highly localized, this energy increases to even a greater extent compared to that involved in the formation of EHP by reaction (3). 16 The thermal generation of charge carriers from dye molecules also yields pairs of opposite charges and, therefore, the W t and W ph values are close to each other, but they are different for different types of dyes.…”

Section: Resultsmentioning

confidence: 94%

“…In addi tion, dissociation of the EHP is affected appreciably by the electronic structure of the donor and acceptor mol ecules, in particular, the more pronounced delocalization of the frontier MO, the weaker the Coulomb attraction between the charge carriers in the EHP and the higher the probability of their separation. 16 Therefore, it would be desirable to use strong organic donors and acceptors, for example, tetrathiafulvalenes and fullerenes. 17, 18 The draw backs of these compounds include poor solubility in and poor compatibility with polymer binders and also the dif ficulty of preparing polymers containing these compounds.…”

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confidence: 99%

Photoconductive organic materials for the near-IR radiation range

et al. 2004

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Polymer composition films based on polystyrene and containing electron donors, viz., substituted tetrathiafulvalenes, an electron acceptor, viz., 2,4,5,7 tetranitrofluoren 9 one, and sensitizers, viz., a cationic polymethine dye, 1,3,3 trimethyl 2 [3 (1,3 dihydro 1,3,3 trimethyl 2H indol 2 ylidene)prop 1 en 1 yl] 3H indolium tetrafluoroborate, and a neutral mero cyanine dye, 5 {3 [(1,3 dihydro 1,3,3 trimethyl 2H indol 2 ylidene)ethylidene] 2 phenyl cyclopent 1 en 1 ylmethylene} 2 thioxodihydropyrimidine 4,6(1H,5H ) dione, were prepared. The internal photoeffect upon film irradiation in the near IR range is provided by low ioniza tion potentials of the donors and the high electron affinity of the acceptor. The photoconduc tivity increases upon replacement of a cationic dye by a neutral one, mainly because of photogeneration of mobile charge carriers of both signs and a decrease in the activation energy for the photoconduction current. The decrease in the activation energy for the photocurrent is due to the fact that in the case of a neutral dye, the mobile charge carriers move away from each other during their separation, while in the case of a cationic dye, the colorless counterion strongly helds the photogenerated charge carrier.The design of the materials that conduct electric cur rent on exposure to near IR radiation is a fairly topical task for photoelectric solar energy converters. 1-3 Along with inorganic semiconductors, the use of organic poly mers and their compositions for this purpose appears promising. 1,4-6 These are selected or developed with al lowance for the requirements to their films placed be tween the electrical contacts in the sandwich structures of photoelectric converters. 7 Generally, the photoconduc tivity of polymer films is provided by the presence of three types of molecules: donors, acceptors, and photo generation centers of charge carriers. 8 If the donor mol ecules are characterized by the ionization potential E i,d (proportional to the HOMO energy) and the acceptor molecules, by the electron affinity A e,a (proportional to the LUMO energy), 9 the molecules of the photogeneration centers are selected to meet the conditions |E i,c | > |E i,d | and |A e,c | < |A e,a |, where E i,c and A e,c are the ionization potential and the electron affinity of the photogeneration center molecule, respectively. If these conditions are ful filled, the absorption of a light quantum gives an elec tron-hole pair (EHP). Dissociation of the EHP results in free charge carriers.An important condition for the photoconduction is the transport of charge carriers within the bulk of the polymer film toward the electrical contacts without cap ture or recombination. 10-15 These structural features and properties of polymeric materials have already been imple mented in films based on carbazolyl containing polymers and polymers with conjugated bonds, 5 which use either intermolecular charge transfer complexes (CTC) or or ganic dyes and their aggregates as IR absorption and charge carrier photogeneration centers.How...

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“…This is due to the fact that one more acceptor group NO 2 is present in the acceptor part of molecule 2 as compared with molecule 1. This leads to an increase in the electron affinity energy and, as a consequence, to a bathochromic shift of the absorption of the complex [2,5,10].…”

Section: Resultsmentioning

confidence: 99%

Holographic Recording Media Based on Systems with Intramolecular and Intermolecular Charge Transfer

et al. 2005

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Information characteristics of holographic recording media based on poly( N -epoxypropylcarbazole) films containing charge-transfer systems as photogeneration sites were studied, in which donor and acceptor molecules (or their fragments) either formed adducts between one another or were covalently bound by polymethylene spacer groups or by a system of conjugated π bonds. The recording media based on compounds with intramolecular charge transfer over a system of conjugated bonds for recording holograms using the photothermoplastic method exhibit an narrower intense spectral sensitivity band and a high holographic sensitivity. In these media, the effect of prolonged storage of latent image before the development of a hologram was revealed and explained.

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The influence of radical-anion electron density distribution on the dissociation efficiency of a bound electron-hole pair in carbazole-containing semiconductors

Cited by 16 publications

References 3 publications

Spin-dependent effects in charge carrier photogeneration in amorphous molecular semiconductor with charge transfer-complex centers

Spin-dependent effects in charge carrier photogeneration in amorphous molecular semiconductor with charge transfer-complex centers

Photoconductive organic materials for the near-IR radiation range

Holographic Recording Media Based on Systems with Intramolecular and Intermolecular Charge Transfer

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