Organic thin films on silicon in making a rectifying junction

Gupta, C. K.; Gupta, Amita; Parashar, TR; Jain, V. K.

doi:10.1016/0040-6090(93)90345-p

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…The first deals with applications of particular properties of biological samples in electronics, while the second deals with the use of organic molecules as electronic elements. One of the main problems for both branches is to use a particular molecular architecture [2,3] realizing parallel channels for different electrical signals. Thus, it is necessary to have a technology allowing different conductive and insulating layers to be organized in suitable ways.…”

Section: Introductionmentioning

confidence: 99%

On the degradation of conducting Langmuir-Blodgett films

Carrara

Gussoni

Erokhin

et al. 1995

J Mater Sci: Mater Electron

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Direct current through conducting Langmuir-Blodgett films was observed as a function of the applied voltage and alternating current as a function of frequency. In some cases voltage-current characteristics appeared to be quasi-ohmic but in other cases they exhibited tunnelling-like behaviour. This phenomenon was interpreted as being due to the progressive detachment of the film from the micro-electrodes, as confirmed by measurements of the conductivity as a function of time. This interpretation was also confirmed by estimating the tunnelling barrier parameters from voltage-current characteristics, by conductivity measurements before and after thermal treatment of the samples and by conductivity measurements of samples stored in air and under vacuum.

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Section: Introductionmentioning

confidence: 99%

On the degradation of conducting Langmuir-Blodgett films

Carrara

Gussoni

Erokhin

et al. 1995

J Mater Sci: Mater Electron

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“…The anodic oxidation of Al to Al 3ϩ is followed by its conversion to the corresponding oxide (Al 2 O 3 )/hydroxide (Al 2 O 3 •xH 2 O). [27][28][29] The cathodic reactions may involve the reduction of the cationic species ͑polaron and bipolaron͒ and the reduction of protons that form along with Al 2 O 3 /Al 2 O 3 •xH 2 O during the corrosion reaction: [27][28][29] The partial dedoping of ClO 4 Ϫ was demonstrated by the decrease in the UV-vis absorption bands for the cationic species. The formation of Al(ClO 4 ) 3 may be considered as one of the corrosion products, but a negligible amount of such a salt ͑binding energy ϭ 75.5-75.8 eV) 30,31 was exhibited by the XPS spectra in Fig.…”

Section: Resultsmentioning

confidence: 98%

“…Figure 1 shows the results of the solid-state reaction of ClO 4 Ϫ -doped PPy films with evaporated Al ͑a͒ and In metals ͑b͒. The amounts of electricity consumed during the electropolymerization were 540 ͑Fig.…”

Section: Methodsmentioning

confidence: 99%

“…1,2 This is because the knowledge of such interfaces should aid and promote the application of polymers in junction devices such as diodes, [3][4][5] solar cells, [6][7][8] and electroluminescent devices, 9 as well as their application to corrosion protection. 10,11 The interactions at the interfaces produce various electronic states ͑or chemical bonds͒ depending on the combination of polymers and metals ͑or inorganic semiconductor͒, and accordingly, contribute to the performances of such electronic devices.…”

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Preparation and Characterization of Composite Films of Polypyrrole with Metal Oxide /Hydroxides Using Galvanic Corrosion Reaction

Watanabe¹,

Kitamura²,

Hoshino³

2003

Electrochem. Solid-State Lett.

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The interactions of electropolymerized polypyrrole ͑PPy͒ films with evaporated aluminum and indium layers were investigated. The apparent occlusion of the metals into the PPy films was induced simply by their storage in air, giving rise to PPy-metal oxide/hydroxides composite films. More important, the composites showed stability against the electrochemical redox cyclings and metal-dependent electric conductivity. The formation of the composite materials was explained by assuming the corrosion reaction that proceeds in the galvanic cells formed between the PPy films and the metals. This assumption was experimentally supported by various control and simulation experiments.Metal ͑or inorganic semiconductor͒/conjugated polymer interfaces have been attracting considerable attention in recent years, and much effort has been made in the understanding of their unique electronic and chemical properties. 1,2 This is because the knowledge of such interfaces should aid and promote the application of polymers in junction devices such as diodes, 3-5 solar cells, 6-8 and electroluminescent devices, 9 as well as their application to corrosion protection. 10,11 The interactions at the interfaces produce various electronic states ͑or chemical bonds͒ depending on the combination of polymers and metals ͑or inorganic semiconductor͒, and accordingly, contribute to the performances of such electronic devices. [12][13][14] We now report our finding that the strong interactions between the evaporated metals ͑Al or In͒ and a conducting polymer ͑poly-pyrrole͒ film cause the former to be apparently occluded into the latter matrix film, and that the resulting organic/inorganic hybrid materials are characterized by their enhanced stability to oxidationreduction ͑or doping-dedoping͒ cycles and their metal-dependent electric conductivity. ExperimentalPolypyrrole ͑PPy͒ films were prepared on an indium-tin oxide coated glass ͑ITO͒ plate by the controlled-potential electropolymerization of pyrrole 15,16 at 1.1 V vs. a saturated calomel electrode ͑SCE͒ in a CH 2 Cl 2 solution containing 65 mM of tetraethylammonium perchlorate ͑TEAP͒ at 0°C under an N 2 atmosphere, followed by washing with CH 2 Cl 2 , air drying at room temperature, and vacuum evaporation of the metals. The film thickness was changed by varying the amount of electricity passed during the electropolymerization and determined by a scanning electron microscopic analysis. For the X-ray photoelectron spectroscopic ͑XPS͒ measurements, a ULVAC phi ESCA 5400 spectrometer with Mg K␣ radiation was used. The absolute binding energy scale was obtained by setting the C 1s peak to 284.6 eV. The composition depth profiles of the films were measured by the combination of argon ion sputtering with XPS. The film conductivity measurements were carried out using the four-point-probe technique. For the measurements of the conductivities, the PPy films were peeled off the ITO electrode and mounted on an insulating adhesive tape. The amount of ClO 4Ϫ incorporated into the as-grown PPy film, i.e., doping ...

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From Protein Nanotechnology to Protein Automata

Nicolini

1996

Molecular Manufacturing

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Organic thin films on silicon in making a rectifying junction

Cited by 5 publications

References 9 publications

On the degradation of conducting Langmuir-Blodgett films

On the degradation of conducting Langmuir-Blodgett films

Preparation and Characterization of Composite Films of Polypyrrole with Metal Oxide /Hydroxides Using Galvanic Corrosion Reaction

From Protein Nanotechnology to Protein Automata

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