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Molecular Nanostructures for Microelectronics

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The Development of the Assembled Molecular Nanostructures Based on Organometallic and Carbonic Clusters in Thin Films and Study of Their Electronic and Magnetic Characteristics by STM and SQUID Technique for Implementation of Nanoelectronic Element Base

Tech Area / Field

  • PHY-SSP/Solid State Physics/Physics
  • MAT-SYN/Materials Synthesis and Processing/Materials

Status
8 Project completed

Registration date
11.09.2000

Completion date
30.12.2005

Senior Project Manager
Bunyatov K S

Leading Institute
Moscow State University / Department of Physics, Russia, Moscow

Supporting institutes

  • IZMIRAN, Russia, Moscow reg., Troitsk\nRussian Academy of Sciences / Institute of Radioengineering and Electronics, Russia, Moscow\nInstitute of General and Inorganic Chemistry (IONKh), Russia, Moscow

Collaborators

  • University of Cambridge, UK, Cambridge\nFriedrich-Schiller-Universität Jena, Germany, Jena\nJustus-Liebig-Universität Giessen, Germany, Giessen\nToyohashi University of Technology, Japan, Toyohashi\nChalmers University of Technology, Sweden, Göteborg\nHypres, USA, NY, Elmsford

Project summary

The implementation and study of structures which characteristic sizes are nanometric is one of the major directions in modern fundamental and applied solid state physics. As a rule, the separate partiсles, large molecules or clusters are the main functional elements of such objects (nanostructures). The ultra small dimension of the nanostructures results in a space quantization and its unique physical properties. The study of these properties gives a key to understanding fundamental space restrictions in traditional electronic and magnetic devices and generates the new principles of electronic devices designing based on completely quantum nature of the nanostructures.

Now the research of the nanostructure properties is actively performed in a number of scientific groups in the USA, Japan and central Europe. The impressive results in single-electron controlled transport in systems consisting of single nano-partiсles and separate molecules were obtained. This area of a science is in the initial phase of the development and now the major problems here are the stability and reproducibility of the objects and the fundamental relations between the structure of functional elements, the dynamics of the electronic transport in it and electrical or magnetic characteristics.

The research in the given area is performed also in Russia. In particular, the Project participants obtained many basic results in the field of nanostructures. In particular, they demonstrated the prototype of the molecular single-electron transistor operating at room temperature (MSU). The Project participants have also rich experience of work in the field of cluster and nanoparticles chemistry (IONCH), technology of the Langmuir-Blodgett thin films deposition, scanning tunnel microscopy (IREE, MSU) and SQUID-microscopy (IZMIRAN, MSU). The unique laboratory equipment was created and successfully operates in MSU and IREE for Langmuir-Blodgett deposition of thin films with incorporated nanoparticles and clusters. The clean rooms of a class 1,000/10,000 with working zones of a class 100 for nanostructures manufacturing and research are exist also. The high-vacuum thin-film deposition installation "Leibold" L560-UV, A700, Z400, and the mask-aligning machines MA750 and MJB3HP of "Karl Zuss" with the resolution up to 0.7 micrometer and electronic lithography on basis of a scanning electronic microscope “Cambridge Instruments” with the beam blanking will be used in project. The techniques of the X-ray diagnostics of the multi-layer thin film structures are developed. The theoretical models for processes description in nanostructures are developed also.

The purpose of the project is:


– to create the ordered molecular nanostructures by thin-film technology and chemistry of metalloorganic and carbon clusters;
– to investigate its electronic and magnetic properties in a wide range of temperature and external electromagnetic fields by STM and SQUID-techniques.

The project execution will speed up progress in the given area of a science, as it will allow:


– to investigate fundamental processes of a charge transport and magnetization in nanoobjects separated by the tunnel barriers with the complicated form of a potential;
– to form technological basis for the nanoelectronic elements;
– to create basis for devices with ultra high density of electronic or magnetic storage of the information.

Scientific problems solved in the project:

1. Development of technology for clusters and metal-containing nanoparticles fabrication and research of its chemical, magnetic and electrophysical characteristics.

2. Formation of nanostructures from nanoparticles and molecular clusters by Langmuir-Blodgett, self-organization, polymerization, and by immobilization through functional groups technologies.

3. Study of electron tunneling effects in fabricated nanostructures with the help of scanning tunnel microscopy (STM) methods at various temperatures.

4. Development of a physical model of single-electron tunneling in quantum nanostructures with discrete energy spectrum and complicated tunnel barrier. Development of the Gibbs-distribution- based methods for simulation of molecular single-electron transistors characteristics in quantum limit. Research of effects of correlated tunneling of electrons in planar systems under action of an external electromagnetic field.

5. Synthesis of molecular cluster with specific magnetic properties for multi-layer planar structures as basis of the new materials for magnetic storage media. The study of magnetic properties of ordered magnetic films with various thickness by the SQUID-techniques.

6. Synthesis of magnetic nanoparticles of (2–10) nm-size made of ferromagnetic materials (Fe, Co, Ni) and materials with a large coercive force (NdFeB, SmCo). Study of a dependence of magnetic characteristics of the films with such particles on its size.

7. Development and creation of the magnetic planar nanostructures with single-phase and homogeneous distribution of magnetic nanometer-size particles (nanophase medium).

8. Implementation of the high-resolution scanning SQUID-microscope for measurements of the thin film and nanostructure magnetic properties at 300 К.

9. Creation of the software package for numerical simulation of the current distribution, domain structures and magnetic fields in the objects under SQUID investigation.

These various, at the first sight, problems are joined by the unity of the chemical and technological processes of the cluster-containing materials preparation, by the similarity of the optical and electronic lithography processes used for nanostructures implementation and by the mutual complementarity of the scanning tunnel microscopy and the scanning SQUID-microscopy in research of the nanostructure’s electrical and magnetic characteristics.

The Project satisfies to all ISTC purposes, as far as the known Russian scientists and experts from the four leading scientific organizations previously engaged in the study and development in the field of missile technologies and active components of the chemical weapon are now involved in the civil research. In the given Project they will participate in the development of the ordered molecular nanostructures by methods of thin-film technology and chemistry of the metal-organic and carbon clusters as well as in research of their electronic and magnetic properties in the wide temperature range and external electromagnetic fields with the help of STM - and SQUID-technologies.

The foreign collaborators will participate also to the Project. It is planned to conduct a number of measurements in the Chalmers University of Technology (Sweden) where the high-resolution magnetic microscope based on two-dimensional electronic gas Hall sensor was created. It has an effective area less than 1 µm2 and can operate in temperature range 4.2–77 K which provide the good possibilities of its use for comprehensive nanostructures research. The traditional scientific collaboration between Laboratory of Cryoelectronics of Moscow State University and Department of Microelectronics and Nanoscience of Chalmers Technological University makes the cooperation in the Project easy and fruitful.

The cooperation with the Technological University of Toyahashi (Japan) in creation and set-up of the software for the high-resolution SQUID-microscopes and in development of the magnetic measurement techniques is also planned.

In the Chemistry Department of the Cambridge University (U.K.) the research of the electromagnetic radiation effect on organic molecular structures are conducted for a long time; the rich experience in use of the developed techniques in applications is accumulated. Thus, the cooperation with this university will have the useful and mutually advantageous basis both in scientific, and in the applied scenario.

The unique physical and chemical techniques of the ordered molecular nanostructures creation by the methods of thin-film technology and chemistry of the metal-organic and carbon clusters will be used in the Project. The techniques include the chromato-mass-spectrometry, gas-chromatography, highly effective liquid chromatography, the X-ray analysis, ESR and NMR-spectroscopy, electronic lithography, the high resolution scanning tunnel and atomic-force microscopy and scanning SQUID-microscopy.

A new knowledge concerning the properties of the ordered molecular nanostructures and early prototypes of the nanoelectronic devices will be the main result of the Project realization. The functional elements of such devices, as a rule, are the separate nanopartiсles, large molecules or molecular clusters. The ultra small size of the such structures results in the space quantization and its unique physical properties. The study of these properties gives a key to understanding of the fundamental space restrictions in traditional electronic and magnetic devices, on the one side, and generates the new principles of electronic systems design sequentially used of the nanostructures quantum nature, from the other side. Results of proposed research will have fundamental character with expressed applied sense and are beyond the scope of this Project.


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