Organic-Inorganic Photoconductor Systems

Meier, Harald; Albrecht, Wolfgang; Tschirwitz, U.

doi:10.1515/9783111507743-032

Cited by 5 publications

(4 citation statements)

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“…The oxidation of sulfur dioxide has been investigated extensively in recent years. Most studies have been directed at direct electrochemical oxidation of SO2 on platinum, gold, alloy, carbon, or graphite electrodes (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17). A few investigations (18)(19)(20)(21)(22)(23)(24) were performed by using a chemical depolarizer, such as a halide ion, to facilitate the anodic oxidation of sulfur dioxide.…”

Section: Introductionmentioning

confidence: 99%

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Reversible Reduction and Reoxidation of Entire Thin Films of Octacyanophthalocyanine

Schümann¹,

Wöhrle²,

Jaeger³

1985

J. Electrochem. Soc.

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The electrochemical properties of solid films of 3,9,10,16,17,23, Zn(II), Cu(II)] were studied by cyclic voltammetry in aqueous electrolytes. The thin (10-100 rim) film electrodes show remarkably stable electrochromic redox behavior, and the charge exchanged in the cathodic and anodic waves, respectively, was found to be between 2 and 3 F/tool for scan rates up to 400 mV/s. For charge compensation, the intercalation of cations is required. At low pH values (intercalation of protons), nernstian behavior was observed, while in alkaline solutions the intercalation of the cations LP, Na t, or K ~ into the solid film was found to be the rate-determining step. From the halfwidth of the current waves, the number of electrons involved in the overall reaction was inferred and found to be different in acid and alkaline solutions. Compared to unsubstituted phthalocyanines 1, the characteristic qualities of the electrodes are associated with the high electric conductivity of 2 and the electron accepting properties of the substituents of the ligand.

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Section: Introductionmentioning

confidence: 99%

“…A great deal of work has been published on their semiconducting properties, and even metallic conductivity has been observed following the doping with acceptors (3)(4)(5)(6)(7)(8)(9). The properties of phthalocyanines as catalysts for the dioxygen reduction in fuel cells have been investigated intensively [ (10)(11)(12)(13)(14)(15)(16), cf. Ref.…”

mentioning

confidence: 99%

Reversible Reduction and Reoxidation of Entire Thin Films of Octacyanophthalocyanine

Schümann¹,

Wöhrle²,

Jaeger³

1985

J. Electrochem. Soc.

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“…The origin of the "mysterious" band in action spectra, reported for some mu1 ticomponent systems, polymer-dye-acceptor [49] or polymer-donoracceptor [SO] , are not readily explained. The position of this band is independent of the second component employed but depends on the nature of the acceptor used.…”

Section: A -+ D * -D -+ Amentioning

confidence: 99%

Electrical Properties of Polymers Doped with Charge Transfer Complexes Forming Additives

Ulański

Jeszka

Κryszewski

1981

Polymer-Plastics Technology and Engineering

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“…electron acceptor to form solid state donor-acceptor complexes with aromatic polynuclear hydrocarbons which exhibit new optical absorption bands in the visible spectral region characteristic of the complex.1-2 Of current interest is the donor-acceptor complex formed between electron acceptors such as TNF and molecules of a carbazole base, particularly the photoconductive polymer, poly(iV-vinylcarbazole) (PVK).3 13 Although TNF and PVK are separately photoconductive, correlations between electrical and optical properties have shown that with the formation of a complex between the two molecules in the solid state the photoconductivity is significantly enhanced and extended to the spectral region of absorption of the donoracceptor complex.…”

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confidence: 99%

Photoconductivity of trinitrofluorenone in tetrahydrofuran

Bigelow¹

1974

J. Phys. Chem.

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Publication costs assisted by Xerox Corporation Weak new absorption bands, not present in either parent compound, were observed when 2,4,7-trinitro-9-fluorenone (TNF) was dissolved in tetrahydrofuran (THF). These new bands appear at ~4700, 5100, and 6500 Á and are attributed to the formation of a donor-acceptor complex between the two molecules. A Benesi-Hildebrand analysis of a 5.0 X 10 3 M solution showed the extinction coefficient of the complex to be ~1Q M"1 cm-1 at 4700 Á and the equilibrium constant to be ~0.06 M~1, Under monochromatic irradiation, the solution exhibited photoconductivity that closely paralleled the photoresponse curve of a TNF single crystal. No photoconductivity was observed in the absorption bands of the donoracceptor complex. The saturation photocurrent was found to be proportional to the applied potential, the square root of the incident photon flux, and TNF concentration. The photocurrent decayed by secondorder kinetics when the light was terminated while initial irradiation produced a hyperbolic tangential growth curve in the photocurrent. A bimolecular recombination mechanism is proposed which explains the dynamic and static behavior of the photoproduced charge carriers. The steady-state photocurrent is then expressed in terms of Ohm's law which exhibits the appropriate dependence on applied voltage, light flux, and TNF concentration. Upon uv irradiation or prolonged standing the solution undergoes an irreversible color change from a pale yellow to a reddish-orange with a simultaneous decrease in photoconductivity.

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Organic-Inorganic Photoconductor Systems

Cited by 5 publications

References 0 publications

Reversible Reduction and Reoxidation of Entire Thin Films of Octacyanophthalocyanine

Reversible Reduction and Reoxidation of Entire Thin Films of Octacyanophthalocyanine

Electrical Properties of Polymers Doped with Charge Transfer Complexes Forming Additives

Photoconductivity of trinitrofluorenone in tetrahydrofuran

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