Advanced Materials

Cover image for Advanced Materials

March 1991

Volume 3, Issue 3

Pages fmi–fmi, 127–172

  1. Masthead

    1. Top of page
    2. Masthead
    3. Articles
    4. Materials Forum
    5. Communications
    6. Research News
    7. Conference Report
    8. Book Reviews
    1. Masthead (page fmi)

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030301

  2. Articles

    1. Top of page
    2. Masthead
    3. Articles
    4. Materials Forum
    5. Communications
    6. Research News
    7. Conference Report
    8. Book Reviews
    1. The Materials Forum of the RWTH Aachen (pages 127–128)

      Prof. Reiner Kopp

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030302

      Essay: Interdisciplinary cooperation within a university can lead to imrpoved problem-solving capability, and through this, enhanced interaction with industry. Another major advantage is the broadening of the education which can be offered to students. Progress in this direction at one of the stongest universities for materials science in Germany is described.

    2. Organic Solar Cells (pages 129–138)

      Prof. Dieter Wöhrle and Dr. Dieter Meissner

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030303

      Review: The conversion of sunlight into electricity can be achieved using a solar cell and is one of the most attractive future soruce of energy. Silicon-based cells, while quite efficient, are difficult and expensive to produce, a fact that drives up the cost of electricity produced using them. The alternative, organic-based cells (see Figure) have the potential advantages of ease of processing and cheapness if their efficiency can be brought up to reasonable levels. Recent progress made and future targets in this field are reviewed.

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    3. Dynamic observations of relaxation processes in semiconductor heterostructures (pages 139–147)

      Dr. Robert Hull and Dr. John C. Bean

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030304

      Review: Strained layer epitaxy, a technique used in the growth of single-crystal semiconductor heterostructures in which ultrathin layers of semiconductors with differing lattice parameters are grown on top of each other, is well suited for the production of high-speed electronic devices. The lattice mismatch causes the accumulation of elastic strain energy which is reduced by the inclusion of defects, such as misfit dislocations. The direct and real-time study of the formation and propagation of these defects using an electron microscope helps us to understand the fundamental processes governing relaxation in heterostructures and is the topic of this review.

  3. Materials Forum

    1. Top of page
    2. Masthead
    3. Articles
    4. Materials Forum
    5. Communications
    6. Research News
    7. Conference Report
    8. Book Reviews
    1. Materials Forum (page 147)

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030305

  4. Communications

    1. Top of page
    2. Masthead
    3. Articles
    4. Materials Forum
    5. Communications
    6. Research News
    7. Conference Report
    8. Book Reviews
    1. A novel combustion synthesis of spinel ferrites, orthoferrites and garnets (pages 148–150)

      Prof. K. Suresh, Dr. N. R. S. Kumar and Dr. K. C. Patil

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030306

      Communication: Transformer cores and read-write heads are two applications of micronsized ferrite powders. The powders (see figure) can be synthesized by the thermal decomposition of precursors in a solid solution, where, generally, atmospheric oxygen can be thought of as the oxidant. However, due to the low yields (∼15%) of these processes an alternative has been developed based on the exothermicity of the redox reaction between metal nitrates (oxidants) and tetraformal trisazine or oxalic acid dihydrazide (fuels).

    2. Large enhancement of the carrier mobility in semiconducting α-sexithienylene thin films by pulsed electrochemical inclusion of metal (pages 150–153)

      Dr. Bai Xu, Dr. Denis Fichou, Dr. Gilles Horowitz and Dr. Francis Garnier

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030307

      Communication: The performance of molecular-based devices canb e improved by increasing the carrier mobility of the organic semiconductor. A method for achieving up to a 700-fold increase in the carrier mobility, which involves the electrochemical inclusion of metal ions (silver and copper) into the semiconducting organic material, is reported. The effect is thought to be the result of the metal ions acting as bridges between neighboring polymer chains thus increasing the interchain carrier hopping rate.

    3. Polyelectrolyte glasses with linear and nonlinear optical properties (pages 153–156)

      Dr. Wolfgang H. Meyer, Dr. Janusz Pecherz, Dr. Alfred Mathy and Prof. Gerhard Wegner

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030308

      Communication: Polyelectrolyte glasses, composed of cationic polymers and anionic dyes have several advantages over traditionally prepared intrinsicly dyed optical glasses for linear-(LO) and nonlinear optical (NLO) applications. Very high dye concentrations canb e achieved, homogeneous distribution of the dye results in high-quality glasses, a large variety of LO- and NLO-active counterieons are available, and the glasses are easily processed. The preparation and testing of the new materials is described.

  5. Research News

    1. Top of page
    2. Masthead
    3. Articles
    4. Materials Forum
    5. Communications
    6. Research News
    7. Conference Report
    8. Book Reviews
    1. Superconducting organic thin films prepared using an evaporation technique (pages 157–159)

      Dr. Kazushige Kawabata, Keiji Tanaka and Makoto Mizutani

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030309

      Research News: Superconducting organic thin films have been produced for the first time making use only of dry processes. The vacuum-evaporation method is suitable for the production of thin films of BEDT-TTF iodide either from electrochemically produced BEDT-TTF iodide or directly from BEDT-TTF and iodine. The insulating films formed in the deposition process are converted to the conducting form by annealing and analyzed using X-ray diffraction (see Figure). The ‘dry’ nature of the process is advantageous as solvents can damage the fine crystals formed and make the production of homogeneous thin films difficult.

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    2. Atomic-resolution electron holography – a realization of gabor's dream? (pages 159–161)

      Prof. Dilano K. Saldin

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030310

      Research News: Three-dimensional atomic-resolution images of copper atoms have recently been produced by the computer reconstruction of superimposed far-field (Fraunhofer) interference patterns generated by electron scattering by individual atoms in the sample. The use of photoelectron sources lends holography chemical specificity and enables the location of atoms around chemically identifiable species to be imaged separately. The historical development of electron holography is described and some examples of the latest achievements given.

  6. Conference Report

    1. Top of page
    2. Masthead
    3. Articles
    4. Materials Forum
    5. Communications
    6. Research News
    7. Conference Report
    8. Book Reviews
    1. Molecular magnetic materials in Il Ciocco (pages 161–163)

      Prof. Dante Gatteschi, Prof. Olivier Kahn, Dr. Joel S. Miller and Prof. Fernando Palacio

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030311

      Conference Reports: Joel Miller of Du Pont describes activities at a recent NATO Advanced Research workshop on molecular magnetic materials held in Italy, and Siegmar Roth of the Max Planck Institute for Solid State Research in Stuttgart reports on a conference on synthetic metals held in southern Germany.

    2. Synthetic metals in Tübingen (pages 164–165)

      Dr. Siegmar Roth

      Article first published online: 15 SEP 2004 | DOI: 10.1002/adma.19910030312

  7. Book Reviews

    1. Top of page
    2. Masthead
    3. Articles
    4. Materials Forum
    5. Communications
    6. Research News
    7. Conference Report
    8. Book Reviews

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