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Leibniz Association
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601 Projects, page 1 of 121
  • Funder: EC Project Code: 657115
    Overall Budget: 171,461 EURFunder Contribution: 171,461 EUR

    The objective of this project is the development of high quality poly silicon (poly-Si) thin films on glass applying liquid-phase crystallization by line focus laser irradiation. Introducing an adequate interface layer between the glass and the silicon film and applying laser crystallization by scanning over thin amorphous or nano-crystalline silicon thin films on glass has been shown to yield high-quality poly-Si films for solar cells. These films on glass present also high potential for other electronic devices like e.g. flat panel displays. In photovoltaic (PV) application this technology could result in significant silicon material savings and therefore cost reduction of PV modules in the near future. In the electronic industry it could give new possibilities to fabricate highly integrated electronic circuits on large area. In the frame of this project the investigation and optimization of the laser crystallization process and the design of the interface layer either for low cost soda-lime float glass or ultra-thin high temperature glass will be a focus. Solar cells and mini modules will be fabricated with the aim to develop on the one hand a process technology for large area monolithic integrated poly-Si thin film modules and on the other hand low cost wafer equivalents for back contacted solar cells which on the long-term can achieve efficiencies of multi-crystalline wafer cells. For characterization and analysis of the electronic and optical properties of the glass/poly-Si substrates and solar cells injection level dependent photoluminescence and spectral response measurements will be further developed and implemented.

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  • Funder: EC Project Code: 297852
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  • Funder: EC Project Code: 648295
    Overall Budget: 1,912,180 EURFunder Contribution: 1,912,180 EUR

    The molecules retaining their magnetization in the absence of magnetic field are known as single molecule magnets (SMMs). Important problems to be solved on the way to the applications of SMMs in molecular spintronics is their deposition on surfaces and addressing their spins on the single molecular level. In this project we will address these problems by designing SMMs based on endohedral metallofullerenes (EMFs) derivatized with anchoring groups. SMM behaviour recently discovered for DySc2N@C80 and Dy2ScN@C80 in PI’s group is governed by a strong magnetic anisotropy (magnetic moments of Dy ions are aligned along the Dy–N bonds) and ferromagnetic exchange interactions between Dy ions within the clusters. Protected by the carbon cages, these SMMs exhibit uniquely long zero-field relaxation times of several hours at 2 K and provide an ideal system for addressing the individual spin states. Spatial orientation of magnetic moments in EMF-SMMs is determined by the endohedral cluster and is therefore influenced by the orientation of the EMFs molecules and their internal dynamics. We will apply three strategies to control the spatial arrangement of the magnetic moments in EMF-SMMs: (i) deposition of EMF molecules via sublimation; (ii) exohedral modification of EMFs with anchoring groups for grafting of EMFs on surfaces; (iii) introducing photoswitchable units into the anchoring groups which can reversibly change their geometry upon impact of light and will allow switching direction of the magnetic moment in a fully controllable way. Magnetic behaviour of the surface-grafted SMMs will be studied by bulk- and surface-sensitive techniques including X-ray magnetic circular dichroism and especially spin-polarized scanning tunneling microscopy. Successful fulfillment of the objectives of this interdisciplinary high-risk/high-gain project will revolutionize the field of the surface molecular magnetism by allowing the study and control of the SMMs on a single spin level.

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  • Funder: SNSF Project Code: 100991
    Funder Contribution: 94,020
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  • Funder: EC Project Code: 853609
    Overall Budget: 1,499,970 EURFunder Contribution: 1,499,970 EUR

    Infertility is a worldwide problem affecting ~11% of the reproductive-age population. Severe cases are currently treated by in vitro fertilization (IVF) and intracytoplasmic injection techniques (ICSI) with high fertilization rates (~95%). However, embryo transfer is still the critical stage with only 32% of the cases resulting in clinical pregnancies. Moreover, the implantation rates per embryo remain very low (~17%) and often the procedure needs to be repeated several times with no success implying a high economic and social cost. Among the different methods used to overcome this issue, gamete or zygote ntrafallopian transfer (GIFT or ZIFT) seems more promising offering appropriate physiological environment for zygote/embryo development at an optimal synchronization between embryonic and endometrial preparation. However, these methods are invasive and involve surgical procedures and anaesthesia to introduce macroscopic imaging and manipulation tools into the female body, increasing the risk of injury and ectopic pregnancies. The goal of Micro-GIFT is to seek for novel approaches to non-invasively transport and release high-quality gametes/zygotes in the fallopian tube in vivo (mice model). For that multifunctional untethered microrobots (~100 µm size) will be developed making use of smart materials and advanced microtechnologies. However, there are major challenges that need to be overcome to bring this technology close to the clinic, such as the in vivo imaging and control of such microrobots, and their removal after use. The project will also provide deeper insights on the contribution of the fallopian tube on the natural embryo development and implantation, being crucial to create more natural procedures with high success rates. The PI has contributed significantly to the field of sperm-based microbots for assisted fertilization and targeted drug delivery as well as developed a variety of novel microbiosensors for molecular and cellular analysis.

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