Castaing microprobe analysis of doped polyacetylene films

Rolland, M.; Aldissi, M.; Cadéne, M.; Bresse, J. F.; Benoît, C.

doi:10.1051/rphysap:01982001706037300

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Moses et al [34] have shown the importance of macroscopic nonuniform doping on physical properties. Nonuniform doping has also been studied by Rolland [31], Janossy [33], Epstein [35], Montaner [12]. The origin of the concentration gradients through the films, has been discussed by Benoit et al [32].…”

Section: Introductionmentioning

confidence: 99%

Infrared transmission of heavily doped polyacetylene

Benoît¹,

Bernard²,

Palpacuer³

et al. 1983

J. Phys. France

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2014 Dans ce travail nous présentons des résultats de mesures de transmission et réflexion dans le domaine infrarouge (4 03BCm-25 03BCm) effectuées sur des films de polyacétylène. Les mesures ont été faites sur des échantillons de polyacétylène [CH(I3-)Y]x de diverses épaisseurs pour des taux Y de dopage à l'iode allant de 0 à 7 %. La méthode utilisée permet d'obtenir des spectres sur des films libres de tout support. De plus contrairement aux techniques usuelles elle permet de travailler, à fort dopage sur des échantillons assez épais, pour lesquels il est possible de déterminer l'épaisseur avec précision et également le taux de dopage par pesée. Les résultats confirment que, bien que le dopage à l'intérieur des fibrilles ne soit pas uniforme, le système est complètement isomérisé. De plus notre analyse prouve que le mode (03C92 à 900 cm-1 qui apparait sous l'action du dopage ne peut pas être le mode d'ancrage. Abstract-This report presents the results of measurements of transmission and reflexion spectra of polyacetylene films in the infrared range 4-25 03BCm. [CH(I3-)Y]x samples were used with various thickness for iodine doping level Y up to 0.07. We used a high detectivity spectrometer which permitted us to obtain spectra with very highly doped free-standing films. In this way, we could measure both the relatively large thicknesses of samples with accuracy and also directly measure the doping level by weight uptake. The results show that, although intrafibril doping is nonuniform, the material is quite isomerized. In addition, our analysis demonstrates that the 03C92 band (900 cm-1) induced upon doping cannot be the pinned mode.

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Section: Introductionmentioning

confidence: 99%

Infrared transmission of heavily doped polyacetylene

Benoît¹,

Bernard²,

Palpacuer³

et al. 1983

J. Phys. France

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“…The diffusion of the iodine into the polymer can be evaluated, since the change in frequency during iodine doping is proportional to the change in mass. The diffusion of gases into polymers has been extensively studied. − Crank and Park and many others − use the sorption of vapors in polymers to determine the diffusion coefficient, D . Assuming D is constant and that diffusion is into a plane sheet, the relationship can be expressed as 34 where M t is the total amount of vapor absorbed at time t , M ∞ is the equilibrium sorption, l is the thickness of the sample, and m is an integer.…”

Section: Resultsmentioning

confidence: 99%

Comparing and Contrasting the Effects of Iodine Doping on Different Types of Polyacetylene Films

Hall

Arbuckle

1996

Macromolecules

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A comparison between Shirakawa polyacetylene or S-(CH) x , Naarmann polyacetylene or N-(CH) x , and Tsukamoto polyacetylene or ν-(CH) x during iodine vapor phase doping has been made. Thin films of each type of polyacetylene were polymerized directly onto quartz crystal substrates. The quartz crystal microbalance (QCM) is used to measure the mass change during doping (oxidation) of polyacetylene with iodine in the vapor phase. For the same mass of dopant, the highest conductivity is observed for ν-(CH) x . The most dense polyacetylene, ν-(CH) x , has the smallest diffusion coefficient on the order of 10-14 cm2/s. The diffusion coefficient for short times (<3000 s) is similar for all three types of polyacetylene (10-12 cm2/s); however, at longer times (10 000−70 000 s), the diffusion coefficients correlate with the densities of the undoped materials.

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“…Various dopant species were used to obtain the metallic polymer, for example I2, MoCls. The morphology depends strongly of the dopant specie and the doping process [6].…”

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confidence: 99%

Polyacetylene thin film photovoltaic devices

Cadéne¹,

Rolland²,

Abadie

1983

Rev. Phys. Appl. (Paris)

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2014 Des dispositifs photovoltaïques ont été fabriqués par polymérisation directe de films minces de polyacétylène dopé ou non dopé sur une lame mince polycristalline de CdS déposée sur verre conducteur. La morphologie du contact est déterminée par microscopie à balayage. Les caractéristiques électriques ont été obtenues à l'obscurité et sous éclairement. Dans des conditions standard (AM1, 100 mW/cm2), les hétérojonctions entièrement couches minces à base de (CH)x dopé atteignent un rendement de 0,5 %. Abstract. 2014 Photovoltaic devices have been obtained by a direct polymerization of undoped (or p-type doped) thin film (CH)x layer onto a polycrystalline cadmium sulfide film. The morphology of the contact is observed by S.E.M. microscopy. The electrical characteristics of this device are studied in the dark or under illumination. The main result, at AM1, 100 mW/cm2 with doped (CH)x correspond to 0.5 percent efficiency.

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Castaing microprobe analysis of doped polyacetylene films

Cited by 5 publications

References 7 publications

Infrared transmission of heavily doped polyacetylene

Infrared transmission of heavily doped polyacetylene

Comparing and Contrasting the Effects of Iodine Doping on Different Types of Polyacetylene Films

Polyacetylene thin film photovoltaic devices

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