Organo-modified metal oxide electrode

Fujihira, Masamichi; Kubota, Tomoko; Osa, Tetsuo

doi:10.1016/s0022-0728(81)80069-1

Cited by 58 publications

(17 citation statements)

References 25 publications

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“…In this molecular design for chemical modification of ITO, we prefer -conjugated systems to alkyl chains as the -conjugated linkage can reduce the barrier heights for hole injection. 4,5 Selection of bonding modes of molecules with high permanent dipole moments is also important because additional dipole is created through the bonding 2,3 in the same way as in chemical adsorption of acids and bases. 6,7 We report here the use of chemically modified ITO with different binding groups ͑-COCl and -PO 2 Cl 2 ͒ of p-chlorobenzene derivatives forming effective monolayers to control hole injection at the anode.…”

mentioning

confidence: 99%

Current-voltage behavior in hole-only single-carrier devices with self-assembling dipole molecules on indium tin oxide anodes

Ganzorig

Sakomura

Ueda

et al. 2006

Applied Physics Letters

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The authors report the use of chemically modified indium tin oxide (ITO) with different binding groups (–COCl and –PO2Cl2) of p-chlorobenzene derivatives forming effective monolayers to control the work function of ITO and hence to enhance the hole injection. The enhanced hole injection is studied by measuring current density–voltage (J-V) characteristics. The behavior of J-V characteristics caused by varying the ITO work function in hole-only single-carrier devices with a hole transport layer of N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine is examined. Upon grafting with p-chlorophenylphosphoryl dichloride, the J-V characteristics show a space-charge-limited conduction behavior. Such modified ITO anodes lead to improvements in the device properties.

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confidence: 99%

Current-voltage behavior in hole-only single-carrier devices with self-assembling dipole molecules on indium tin oxide anodes

Ganzorig

Sakomura

Ueda

et al. 2006

Applied Physics Letters

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“…22, No. 7,1990 working, counter, and reference electrodes, respectively. The LB films on the electrode were kept in contact with an aqueous electrolyte solution of pH 4 containing 10 mM hydroquinone as reducing reagent.…”

Section: Measurement Of Photocurrentmentioning

confidence: 99%

“…7 One of the authors reported that the photocurrent was observed in the TPP modified electrode with high efficiency by irradiation of light, but the photocurrent became steeply down within a short period. 7 Langmuir-Blodgett (LB) technique 8 is one of the useful methods for the modification of electrode surface. 9 Chlorophyll LB films prepared on the semiconductor electrodes were studied in connection with the mechanism of primary photosynthetic processes.…”

Section: Introductionmentioning

confidence: 99%

“…TPPs have been used for the modification of electrodes by vapor depositions, 3 -5 casting, 4 -6 and chemically bonding methods. 7 One of the authors reported that the photocurrent was observed in the TPP modified electrode with high efficiency by irradiation of light, but the photocurrent became steeply down within a short period. 7 Langmuir-Blodgett (LB) technique 8 is one of the useful methods for the modification of electrode surface.…”

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Preparation and Photocurrent Properties of Tin Dioxide Electrode Modified by Polyimide Lagmuir-Blodgett Films Possessing Tetraphenylporphyrin Unit

Nishikata

Morikawa

Kakimoto

et al. 1990

Polym J

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ABSTRACT:Polyimide Langmuir-Blodgett (LB) film containing tetraphenylporphyrin (TPP) unit was newly prepared on the surfaoe of tin dioxide electrode by "Precursor method" (Electrode I), and the generation ofphotocurrent was measured by the wet system. The photocurrent spectrum obtained was very similar in shape to the absorption spectrum of the LB film. The quantum efficiency of the electrode modified by one layer of the polyimide LB film was 0.178, and the values decreased with increasing the number of layers. The long term stability of the photocurrent of Electrode I was compared with that of the electrode possessing the monomeric TPP LB film prepared from a 1: 1 mixture of monoamino-TPP and stearic acid (Electrode II). These two electrodes were stable under the irradiation of monochromatic light of 430 nm, while in the case of the direct irradiation of the xenon lamp, Electrode I kept the same level of the initial photocurrent for a long time, but Electrode II decreased to 50% within one hour. The absorption spectra indicated that both LB films did not come off from the surface of the electrodes during the photocurrent measurements. The decrease of the photocurrent of Electrode II was explained by the hydrophobicity of the surface of the LB film possessing the long alkyl chain and by the diffusing effect of the reducing agent in the electrolyte solution.KEY WORDS Langmuir-Blodgett Film / Polyimide / Tin Dioxide / Tetraphenylprophyrin / Electron transfer / Photocurrent / Quantum Efficiency / .Porphines are well known as sensitizers working in the photosynthesis in plants, 1 and in the artificial solar energy conversion systems. 2 Tetraphenylporphyrins (TPPs) are the typical synthetic model compounds in the porphine family. TPPs have been used for the modification of electrodes by vapor depositions, 3 -5 casting, 4 -6 and chemically bonding methods. 7 One of the authors reported that the photocurrent was observed in the TPP modified electrode with high efficiency by irradiation of light, but the photocurrent became steeply down within a short period. 7 Langmuir-Blodgett (LB) technique 8 is one of the useful methods for the modification of electrode surface. 9 Chlorophyll LB films prepared on the semiconductor electrodes were studied in connection with the mechanism of primary photosynthetic processes. 10 -12 We have developed "Precursor method" for the preparation of polyimide LB films. 13 -15 The characteristics of the polyimide LB films were as follows: 1) Monolayer thickness of the LB films was about only one fourth of usual fatty acid LB films 16 because of the absence of the long alkyl chain.2) The polyimide LB films had high stability against water and organic chemicals, as well as high temperature stability.

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“…11 Besides, Fujihira and his coworkers 12,13 first reported the dehydrative coupling of a carboxyl group of rhodamine B with a surface hydroxyl group to form a presumed ester linkage. Soon after, Goodenough and his coworkers [14][15][16] demonstrated a general method for the attachment of carboxylic acid containing polypyridyl complexes to metal oxides with monolayer surface coverage.…”

Section: Introductionmentioning

confidence: 99%

Novel Roles of Metal Ions in Layered Self‐assembled Films of Polynuclear Complexes on Their Photoinduced Electron Transfer Properties

Wei¹,

Liu

Huang³

et al. 2006

Chin. J. Chem.

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Three metal ion bridged self-assembled (SA) films of cis-di(thiocyanato)-bis (2,2'-bipyridyl-4,4'-dicarboxylate) ruthenium were fabricated and characterized by contact angle, UV spectra, cyclic voltammetry and XPS. Their photoinduced electron transfer properties (PETP) were examined. Among the titled systems, the highest steady anodic photocurrent of 1773-1843 nA/cm 2 and the highest quantum yield of 3.2% were achieved. The effects of incident light intensity, bias voltage, and electron donor were also studied. The possible mechanism of electron transfer was proposed. The results reveal that different metal ion in SA films could affect significantly the photoinduced electron transfer property. Our experimental results clearly show that bridging metal ions can play both functional and structural roles in these self-assembled systems. This method of forming functional films can provide a new approach to regulate the property of similar systems.

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Organo-modified metal oxide electrode

Cited by 58 publications

References 25 publications

Current-voltage behavior in hole-only single-carrier devices with self-assembling dipole molecules on indium tin oxide anodes

Current-voltage behavior in hole-only single-carrier devices with self-assembling dipole molecules on indium tin oxide anodes

Preparation and Photocurrent Properties of Tin Dioxide Electrode Modified by Polyimide Lagmuir-Blodgett Films Possessing Tetraphenylporphyrin Unit

Novel Roles of Metal Ions in Layered Self‐assembled Films of Polynuclear Complexes on Their Photoinduced Electron Transfer Properties

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