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Alain Audouard - One of the best experts on this subject based on the ideXlab platform.

  • Quantum oscillations of a linear chain of coupled orbits with small effective masses: The Organic Metal θ -(BETS) 4 CoBr 4 (C 6 H 4 Cl 2 )
    Synthetic Metals, 2017
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, L Drigo, E I Zhilyaeva, Rustem B. Lyubovskii, Rimma N. Lyubovskaya
    Abstract:

    De Haas–van Alphen (dHvA) and Shubnikov–de Haas (SdH) oscillations of the Organic Metal θ-(BETS)4CoBr4(C6H4Cl2) are studied in magnetic fields of up to 55 T at liquid helium temperatures. In line with Fermi surfaces (FS) illustrating the linear chain of coupled orbits, the observed Fourier components are linear combinations of the frequencies linked to the two basic orbits α and β, which have small effective masses compared to other Organic Metals with the same FS topology. Analytical formulas based on a second order development of the free energy within the canonical ensemble, not only account for the field and temperature dependence of the dHvA amplitudes but also for their relative values. In addition, strongly non-Lifshitz–Kosevich behaviours are quantitatively interpreted. In contrast, Shubnikov–de Haas oscillations are not accounted for by this model.

  • Quantum oscillations of a linear chain of coupled orbits with small effective masses: the Organic Metal θ-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2 )
    2017
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, L Drigo, E I Zhilyaeva, Rustem B. Lyubovskii, Rimma N. Lyubovskaya
    Abstract:

    De Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) oscillations of the Organic Metal θ-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2) are studied in magnetic fields of up to 55 T at liquid helium temperatures. In line with Fermi surfaces (FS) illustrating the linear chain of coupled orbits, the observed Fourier components are linear combinations of the frequencies linked to the two basic orbits α and β, which have small effective masses compared to other Organic Metals with the same FS topology. Analytical formulas based on a second order development of the free energy within the canonical ensemble, not only account for the field and temperature dependence of the dHvA amplitudes but also for their relative values. In addition, strongly non-Lifshitz-Kosevich behaviours are quantitatively interpreted. In contrast, Shubnikov-de Haas oscillations are not accounted for by this model. short title: Quantum oscillations of θ-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2)

  • De Haas-van Alphen oscillations in the compensated Organic Metal alpha-'pseudo-kappa'-(ET)4H3O[Fe(C2O4)3].(C6H4Br2)
    2014
    Co-Authors: Alain Audouard, Vladimir Laukhin, Jean-yves Fortin, David Vignolles, Enric Canadell, Tatyana G. Prokhorova, Eduard Yagubskii
    Abstract:

    Field-, temperature- and angle-dependent Fourier amplitude of de Haas-van Alphen (dHvA) oscillations are calculated for compensated two-dimensional (2D) Metals with textbook Fermi surface (FS) composed of one hole and two electron orbits connected by magnetic breakdown. It is demonstrated that, taking into account the opposite sign of electron and hole orbits, a given Fourier component involves combination of several orbits, the contribution of which must be included in the calculations. Such FS is observed in the strongly 2D Organic Metal alpha-'pseudo-kappa'-(ET)4H3O[Fe(C2O4)3].(C6H4Br2), dHvA oscillations of which have been studied up to 55 T for various directions of the magnetic field with respect to the conducting plane. Calculations are in good quantitative agreement with the data.

  • De Haas-van Alphen oscillations in the compensated Organic Metal alpha-'pseudo-kappa'-(ET)(4)H3O[Fe(C2O4)(3)]center dot(C6H4Br2)
    European Physical Journal B: Condensed Matter and Complex Systems, 2014
    Co-Authors: Alain Audouard, Tatyana G. Prokhorova, Eduard B. Yagubskii, Jean-yves Fortin, David Vignolles, Vladimir N. Laukhin, Enric Canadell
    Abstract:

    Field-, temperature- and angle-dependent Fourier amplitude of de Haas-van Alphen (dHvA) oscillations are calculated for compensated two-dimensional (2D) Metals with textbook Fermi surface (FS) composed of one hole and two electron orbits connected by magnetic breakdown. It is demonstrated that, taking into account the opposite sign of electron and hole orbits, a given Fourier component involves combination of several orbits, the contribution of which must be included in the calculations. Such FS is observed in the strongly 2D Organic Metal alpha-'pseudo-kappa'-(ET)(4)H3O[Fe(C2O4)(3)]center dot(C6H4Br2), dHvA oscillations of which have been studied up to 55 T for various directions of the magnetic field with respect to the conducting plane. Calculations are in good quantitative agreement with the data.

  • Onsager phase factor of quantum oscillations in the Organic Metal theta-(BEDT-TTF)4CoBr4(C6H4Cl2)
    Synthetic Metals, 2013
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, Rustem Lyubovskii, Elena Zhilyaeva, Rimma Lyubovskaya, Enric Canadell
    Abstract:

    De Haas-van Alphen oscillations are studied for Fermi surfaces illustrating the Pippard's model, commonly observed in multiband Organic Metals. Field- and temperature-dependent amplitude of the various Fourier components, linked to frequency combinations arising from magnetic breakdown between different bands, are considered. Emphasis is put on the Onsager phase factor of these components. It is demonstrated that, in addition to the usual Maslov index, field-dependent phase factors must be considered to precisely account for the data at high magnetic field. We present compelling evidence of the existence of such contributions for the Organic Metal theta-(BEDT-TTF)4CoBr4(C6H4Cl2).

Enric Canadell - One of the best experts on this subject based on the ideXlab platform.

  • De Haas-van Alphen oscillations in the compensated Organic Metal alpha-'pseudo-kappa'-(ET)4H3O[Fe(C2O4)3].(C6H4Br2)
    2014
    Co-Authors: Alain Audouard, Vladimir Laukhin, Jean-yves Fortin, David Vignolles, Enric Canadell, Tatyana G. Prokhorova, Eduard Yagubskii
    Abstract:

    Field-, temperature- and angle-dependent Fourier amplitude of de Haas-van Alphen (dHvA) oscillations are calculated for compensated two-dimensional (2D) Metals with textbook Fermi surface (FS) composed of one hole and two electron orbits connected by magnetic breakdown. It is demonstrated that, taking into account the opposite sign of electron and hole orbits, a given Fourier component involves combination of several orbits, the contribution of which must be included in the calculations. Such FS is observed in the strongly 2D Organic Metal alpha-'pseudo-kappa'-(ET)4H3O[Fe(C2O4)3].(C6H4Br2), dHvA oscillations of which have been studied up to 55 T for various directions of the magnetic field with respect to the conducting plane. Calculations are in good quantitative agreement with the data.

  • De Haas-van Alphen oscillations in the compensated Organic Metal alpha-'pseudo-kappa'-(ET)(4)H3O[Fe(C2O4)(3)]center dot(C6H4Br2)
    European Physical Journal B: Condensed Matter and Complex Systems, 2014
    Co-Authors: Alain Audouard, Tatyana G. Prokhorova, Eduard B. Yagubskii, Jean-yves Fortin, David Vignolles, Vladimir N. Laukhin, Enric Canadell
    Abstract:

    Field-, temperature- and angle-dependent Fourier amplitude of de Haas-van Alphen (dHvA) oscillations are calculated for compensated two-dimensional (2D) Metals with textbook Fermi surface (FS) composed of one hole and two electron orbits connected by magnetic breakdown. It is demonstrated that, taking into account the opposite sign of electron and hole orbits, a given Fourier component involves combination of several orbits, the contribution of which must be included in the calculations. Such FS is observed in the strongly 2D Organic Metal alpha-'pseudo-kappa'-(ET)(4)H3O[Fe(C2O4)(3)]center dot(C6H4Br2), dHvA oscillations of which have been studied up to 55 T for various directions of the magnetic field with respect to the conducting plane. Calculations are in good quantitative agreement with the data.

  • Onsager phase factor of quantum oscillations in the Organic Metal theta-(BEDT-TTF)4CoBr4(C6H4Cl2)
    Synthetic Metals, 2013
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, Rustem Lyubovskii, Elena Zhilyaeva, Rimma Lyubovskaya, Enric Canadell
    Abstract:

    De Haas-van Alphen oscillations are studied for Fermi surfaces illustrating the Pippard's model, commonly observed in multiband Organic Metals. Field- and temperature-dependent amplitude of the various Fourier components, linked to frequency combinations arising from magnetic breakdown between different bands, are considered. Emphasis is put on the Onsager phase factor of these components. It is demonstrated that, in addition to the usual Maslov index, field-dependent phase factors must be considered to precisely account for the data at high magnetic field. We present compelling evidence of the existence of such contributions for the Organic Metal theta-(BEDT-TTF)4CoBr4(C6H4Cl2).

  • Onsager phase factor of quantum oscillations in the Organic Metal θ-(BEDT-TTF)4CoBr4(C6H4Cl2)
    Synthetic Metals, 2013
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, Rustem Lyubovskii, Elena Zhilyaeva, Rimma Lyubovskaya, Enric Canadell
    Abstract:

    Abstract de Haas–van Alphen oscillations are studied for Fermi surfaces illustrating the Pippard's model, commonly observed in multiband Organic Metals. Field- and temperature-dependent amplitude of the various Fourier components, linked to frequency combinations arising from magnetic breakdown between different bands, are considered. Emphasis is put on the Onsager phase factor of these components. It is demonstrated that, in addition to the usual Maslov index, field-dependent phase factors must be considered to precisely account for the data at high magnetic field. We present compelling evidence of the existence of such contributions for the Organic Metal θ -(BEDT-TTF) 4 CoBr 4 (C 6 H 4 Cl 2 ).

  • Quantum oscillations in the linear chain of coupled orbits: the Organic Metal with two cation layers theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2))
    EPL - Europhysics Letters, 2012
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, L Drigo, F Duc, Rustem B. Lyubovskii, Elena I. Zhilayeva, Rimma N. Lyubovskaya, Gena Shilov, Enric Canadell
    Abstract:

    Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (alpha) and magnetic breakdown-induced (beta and 2beta - alpha) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the 'forbidden orbit' beta - alpha amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2alpha and the magnetic breakdown orbit beta + alpha, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D Organic Metal theta- theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2)).

David Vignolles - One of the best experts on this subject based on the ideXlab platform.

  • Quantum oscillations of a linear chain of coupled orbits with small effective masses: The Organic Metal θ -(BETS) 4 CoBr 4 (C 6 H 4 Cl 2 )
    Synthetic Metals, 2017
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, L Drigo, E I Zhilyaeva, Rustem B. Lyubovskii, Rimma N. Lyubovskaya
    Abstract:

    De Haas–van Alphen (dHvA) and Shubnikov–de Haas (SdH) oscillations of the Organic Metal θ-(BETS)4CoBr4(C6H4Cl2) are studied in magnetic fields of up to 55 T at liquid helium temperatures. In line with Fermi surfaces (FS) illustrating the linear chain of coupled orbits, the observed Fourier components are linear combinations of the frequencies linked to the two basic orbits α and β, which have small effective masses compared to other Organic Metals with the same FS topology. Analytical formulas based on a second order development of the free energy within the canonical ensemble, not only account for the field and temperature dependence of the dHvA amplitudes but also for their relative values. In addition, strongly non-Lifshitz–Kosevich behaviours are quantitatively interpreted. In contrast, Shubnikov–de Haas oscillations are not accounted for by this model.

  • Quantum oscillations of a linear chain of coupled orbits with small effective masses: the Organic Metal θ-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2 )
    2017
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, L Drigo, E I Zhilyaeva, Rustem B. Lyubovskii, Rimma N. Lyubovskaya
    Abstract:

    De Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) oscillations of the Organic Metal θ-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2) are studied in magnetic fields of up to 55 T at liquid helium temperatures. In line with Fermi surfaces (FS) illustrating the linear chain of coupled orbits, the observed Fourier components are linear combinations of the frequencies linked to the two basic orbits α and β, which have small effective masses compared to other Organic Metals with the same FS topology. Analytical formulas based on a second order development of the free energy within the canonical ensemble, not only account for the field and temperature dependence of the dHvA amplitudes but also for their relative values. In addition, strongly non-Lifshitz-Kosevich behaviours are quantitatively interpreted. In contrast, Shubnikov-de Haas oscillations are not accounted for by this model. short title: Quantum oscillations of θ-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2)

  • De Haas-van Alphen oscillations in the compensated Organic Metal alpha-'pseudo-kappa'-(ET)4H3O[Fe(C2O4)3].(C6H4Br2)
    2014
    Co-Authors: Alain Audouard, Vladimir Laukhin, Jean-yves Fortin, David Vignolles, Enric Canadell, Tatyana G. Prokhorova, Eduard Yagubskii
    Abstract:

    Field-, temperature- and angle-dependent Fourier amplitude of de Haas-van Alphen (dHvA) oscillations are calculated for compensated two-dimensional (2D) Metals with textbook Fermi surface (FS) composed of one hole and two electron orbits connected by magnetic breakdown. It is demonstrated that, taking into account the opposite sign of electron and hole orbits, a given Fourier component involves combination of several orbits, the contribution of which must be included in the calculations. Such FS is observed in the strongly 2D Organic Metal alpha-'pseudo-kappa'-(ET)4H3O[Fe(C2O4)3].(C6H4Br2), dHvA oscillations of which have been studied up to 55 T for various directions of the magnetic field with respect to the conducting plane. Calculations are in good quantitative agreement with the data.

  • De Haas-van Alphen oscillations in the compensated Organic Metal alpha-'pseudo-kappa'-(ET)(4)H3O[Fe(C2O4)(3)]center dot(C6H4Br2)
    European Physical Journal B: Condensed Matter and Complex Systems, 2014
    Co-Authors: Alain Audouard, Tatyana G. Prokhorova, Eduard B. Yagubskii, Jean-yves Fortin, David Vignolles, Vladimir N. Laukhin, Enric Canadell
    Abstract:

    Field-, temperature- and angle-dependent Fourier amplitude of de Haas-van Alphen (dHvA) oscillations are calculated for compensated two-dimensional (2D) Metals with textbook Fermi surface (FS) composed of one hole and two electron orbits connected by magnetic breakdown. It is demonstrated that, taking into account the opposite sign of electron and hole orbits, a given Fourier component involves combination of several orbits, the contribution of which must be included in the calculations. Such FS is observed in the strongly 2D Organic Metal alpha-'pseudo-kappa'-(ET)(4)H3O[Fe(C2O4)(3)]center dot(C6H4Br2), dHvA oscillations of which have been studied up to 55 T for various directions of the magnetic field with respect to the conducting plane. Calculations are in good quantitative agreement with the data.

  • Onsager phase factor of quantum oscillations in the Organic Metal theta-(BEDT-TTF)4CoBr4(C6H4Cl2)
    Synthetic Metals, 2013
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, Rustem Lyubovskii, Elena Zhilyaeva, Rimma Lyubovskaya, Enric Canadell
    Abstract:

    De Haas-van Alphen oscillations are studied for Fermi surfaces illustrating the Pippard's model, commonly observed in multiband Organic Metals. Field- and temperature-dependent amplitude of the various Fourier components, linked to frequency combinations arising from magnetic breakdown between different bands, are considered. Emphasis is put on the Onsager phase factor of these components. It is demonstrated that, in addition to the usual Maslov index, field-dependent phase factors must be considered to precisely account for the data at high magnetic field. We present compelling evidence of the existence of such contributions for the Organic Metal theta-(BEDT-TTF)4CoBr4(C6H4Cl2).

Jean-yves Fortin - One of the best experts on this subject based on the ideXlab platform.

  • Quantum oscillations of a linear chain of coupled orbits with small effective masses: The Organic Metal θ -(BETS) 4 CoBr 4 (C 6 H 4 Cl 2 )
    Synthetic Metals, 2017
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, L Drigo, E I Zhilyaeva, Rustem B. Lyubovskii, Rimma N. Lyubovskaya
    Abstract:

    De Haas–van Alphen (dHvA) and Shubnikov–de Haas (SdH) oscillations of the Organic Metal θ-(BETS)4CoBr4(C6H4Cl2) are studied in magnetic fields of up to 55 T at liquid helium temperatures. In line with Fermi surfaces (FS) illustrating the linear chain of coupled orbits, the observed Fourier components are linear combinations of the frequencies linked to the two basic orbits α and β, which have small effective masses compared to other Organic Metals with the same FS topology. Analytical formulas based on a second order development of the free energy within the canonical ensemble, not only account for the field and temperature dependence of the dHvA amplitudes but also for their relative values. In addition, strongly non-Lifshitz–Kosevich behaviours are quantitatively interpreted. In contrast, Shubnikov–de Haas oscillations are not accounted for by this model.

  • Quantum oscillations of a linear chain of coupled orbits with small effective masses: the Organic Metal θ-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2 )
    2017
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, L Drigo, E I Zhilyaeva, Rustem B. Lyubovskii, Rimma N. Lyubovskaya
    Abstract:

    De Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) oscillations of the Organic Metal θ-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2) are studied in magnetic fields of up to 55 T at liquid helium temperatures. In line with Fermi surfaces (FS) illustrating the linear chain of coupled orbits, the observed Fourier components are linear combinations of the frequencies linked to the two basic orbits α and β, which have small effective masses compared to other Organic Metals with the same FS topology. Analytical formulas based on a second order development of the free energy within the canonical ensemble, not only account for the field and temperature dependence of the dHvA amplitudes but also for their relative values. In addition, strongly non-Lifshitz-Kosevich behaviours are quantitatively interpreted. In contrast, Shubnikov-de Haas oscillations are not accounted for by this model. short title: Quantum oscillations of θ-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2)

  • De Haas-van Alphen oscillations in the compensated Organic Metal alpha-'pseudo-kappa'-(ET)4H3O[Fe(C2O4)3].(C6H4Br2)
    2014
    Co-Authors: Alain Audouard, Vladimir Laukhin, Jean-yves Fortin, David Vignolles, Enric Canadell, Tatyana G. Prokhorova, Eduard Yagubskii
    Abstract:

    Field-, temperature- and angle-dependent Fourier amplitude of de Haas-van Alphen (dHvA) oscillations are calculated for compensated two-dimensional (2D) Metals with textbook Fermi surface (FS) composed of one hole and two electron orbits connected by magnetic breakdown. It is demonstrated that, taking into account the opposite sign of electron and hole orbits, a given Fourier component involves combination of several orbits, the contribution of which must be included in the calculations. Such FS is observed in the strongly 2D Organic Metal alpha-'pseudo-kappa'-(ET)4H3O[Fe(C2O4)3].(C6H4Br2), dHvA oscillations of which have been studied up to 55 T for various directions of the magnetic field with respect to the conducting plane. Calculations are in good quantitative agreement with the data.

  • De Haas-van Alphen oscillations in the compensated Organic Metal alpha-'pseudo-kappa'-(ET)(4)H3O[Fe(C2O4)(3)]center dot(C6H4Br2)
    European Physical Journal B: Condensed Matter and Complex Systems, 2014
    Co-Authors: Alain Audouard, Tatyana G. Prokhorova, Eduard B. Yagubskii, Jean-yves Fortin, David Vignolles, Vladimir N. Laukhin, Enric Canadell
    Abstract:

    Field-, temperature- and angle-dependent Fourier amplitude of de Haas-van Alphen (dHvA) oscillations are calculated for compensated two-dimensional (2D) Metals with textbook Fermi surface (FS) composed of one hole and two electron orbits connected by magnetic breakdown. It is demonstrated that, taking into account the opposite sign of electron and hole orbits, a given Fourier component involves combination of several orbits, the contribution of which must be included in the calculations. Such FS is observed in the strongly 2D Organic Metal alpha-'pseudo-kappa'-(ET)(4)H3O[Fe(C2O4)(3)]center dot(C6H4Br2), dHvA oscillations of which have been studied up to 55 T for various directions of the magnetic field with respect to the conducting plane. Calculations are in good quantitative agreement with the data.

  • Onsager phase factor of quantum oscillations in the Organic Metal theta-(BEDT-TTF)4CoBr4(C6H4Cl2)
    Synthetic Metals, 2013
    Co-Authors: Alain Audouard, Jean-yves Fortin, David Vignolles, Rustem Lyubovskii, Elena Zhilyaeva, Rimma Lyubovskaya, Enric Canadell
    Abstract:

    De Haas-van Alphen oscillations are studied for Fermi surfaces illustrating the Pippard's model, commonly observed in multiband Organic Metals. Field- and temperature-dependent amplitude of the various Fourier components, linked to frequency combinations arising from magnetic breakdown between different bands, are considered. Emphasis is put on the Onsager phase factor of these components. It is demonstrated that, in addition to the usual Maslov index, field-dependent phase factors must be considered to precisely account for the data at high magnetic field. We present compelling evidence of the existence of such contributions for the Organic Metal theta-(BEDT-TTF)4CoBr4(C6H4Cl2).

Bernhard Wessling - One of the best experts on this subject based on the ideXlab platform.

  • New Insight into Organic Metal Polyaniline Morphology and Structure
    Polymers, 2010
    Co-Authors: Bernhard Wessling
    Abstract:

    Polyaniline is known to be a true Metal, though a nanoMetal. Previous experimental and theoretical evidence is reviewed. Two important structural features are presented, which have not publicly been discussed so far: (a) The formation of complexes between polyaniline and Metals (Cu, Fe, Zn, In, etc.) which are crucial for most practical applications of the Organic Metal, polyaniline; and (b) a model for the polyaniline chain structure within the smallest morphological unit, the roughly 10 nm primary particle.

  • OrmeSTAR Ultra – the Organic Metal nanofinish
    Circuit World, 2010
    Co-Authors: Bernhard Wessling, Melanie Rischka, Joerg Posdorfer
    Abstract:

    Purpose – The purpose of this paper is to introduce a new class of surface finishes as an alternative to current final surface finishes.Design/methodology/approach – This new finish utilises nanotechnology and is based on a new formulation of the “Organic Metal” (OM).Findings – The final surface finish is an approximately 50 nm thin permanent layer, consisting of a complex between the OM and silver (Ag). Panels finished with OrmeSTAR™ Ultra show excellent solderability in spite of a low‐layer thickness and therefore offer significant advantages over existing surface finishes.Originality/value – This new finish has proven to be a competitive alternative to current final finishes with excellent properties for soldering applications. The new nanotechnology can also significantly improve the environmental and economical consequences of solderable surface finishing.

  • Nanotechnology for lead-free PWB final finishes with the Organic Metal
    2009 4th International Microsystems Packaging Assembly and Circuits Technology Conference, 2009
    Co-Authors: Bernhard Wessling, Jim Kenny
    Abstract:

    For the first time, a thin layer of only a few nano-meters has been deposited onto copper pads of printed circuit boards which provides effective protection against oxidation and preserves its solderability. The Nano layer has a thickness of nominally only 50 nm, and contains the Organic Metal (conductive polymer) and a small amount of silver. With ≪ 90% (by volume), the Organic Metal is the major component of the deposited layer, Ag is present equivalent to a thickness of 4 nm. This Organic Metal - Ag complex final finish outperforms any established surface finishes.

  • THIN IMMERSION TIN USING Organic MetalS
    2009
    Co-Authors: Jim Kenny, Bernhard Wessling, Nils Arendt, Karl F. Wengenroth
    Abstract:

    With the international implementation of lead-free technologies/processes use of Immersion Tin usage as a PWB final finish is expected to grow substantially in the near future. With the world-wide growing demand for Immersion Tin, the demands towards the product and process technology consequently increase significantly. Market leading OEMs require the surface finish to have higher tin thickness, improved solderability at multiple heat cycles and higher temperatures, perfect surface flatness, fine pitch compatibility, etc. Modern Immersion Tin technology can serve such requirements and has proven over several years its superior product and process advantages at market leading PCB manufacturers. New technology using unique Organic Metal technology in the immersion tin process allows for thinner tin coatings without sacrificing performance. The catalyst and passivation effect of the Organic Metal leads to a large grain size with a low affinity for oxidation or whiskers and high process reliability. The ability of a thin immersion tin to achieve comparable performance to thick immersion tin results in significant improvements in process costs, yields and environmental impact.

  • An Organic Metal/Silver Nanoparticle Finish on Copper for Efficient Passivation and Solderability Preservation
    Nanoscale Research Letters, 2007
    Co-Authors: Bernhard Wessling, Marco Thun, Carmen Arribas-sanchez, Sussane Gleeson, Joerg Posdorfer, Melanie Rischka, Bjoern Zeysing
    Abstract:

    For the first time, a complex formed by polyaniline (in its Organic Metal form) and silver has been deposited on copper in nanoparticulate form. When depositing on Cu pads of printed circuit boards it efficiently protects against oxidation and preserves its solderability. The deposited layer has a thickness of only nominally 50 nm, containing the Organic Metal (conductive polymer), polyaniline, and silver. With >90% (by volume), polyaniline (PAni) is the major component of the deposited layer, Ag is present equivalent to a 4 nm thickness. The Pani–Ag complex is deposited on Cu in form of about 100 nm small particles. Morphology, electrochemical characteristics, anti-oxidation and solderability results are reported.