In a joint project between the Technology Foundation STW and the energy agency Novem at Utrecht University, researchers have developed new silicon layers which are more stable and cheaper than the present amorphous silicon layers. The electronic properties of the present layers in laptop screens and solar cells deteriorate if the material is under ‘stress’, for example due to sunshine or a voltage.
Flat-panel displays and solar cells have a substrate of glass or plastic, which is coated with a thin layer of amorphous silicon. The silicon layer is a semiconductor which, under the influence of a brief local voltage, becomes conductive for a fraction of a second. This property makes it possible to create a potential difference via the amorphous silicon which addresses separate pixels in an active-matrix LCD display. However, the disadvantage of amorphous silicon is its instability. The threshold voltage needed to make the silicon conducting, changes if a prolonged gate voltage is applied. This is the case in thin film transistors, the devices which address the pixels in a flat-panel display. The microscopic mechanism of this ‘metastability’ is still not understood. Accordingly the application of amorphous silicon for thin film transistors in flat-panel displays and solar cells has not yet reached its full potential.
In the research project from STW and Novem, the Utrecht researchers tried to improve the electronic material properties of the silicon layers. They developed silicon layers which are more stable than the commonly used layers of amorphous silicon. By means of a simple method, hot-wire chemical vapour deposition, they also managed to deposit this layer at a rate ten times higher than conventional techniques. This considerably reduces the production costs of flat-panel displays and solar cells. This could be interesting for manufacturers of displays and solar cells and for the semiconductor industry.
For further information please contact Dr Bernd Stannowski (Debye Institute, Utrecht University), tel. + 31(0) 30 2532964, fax +31 (0)30 2543165, e-mail email@example.com. Information is also available on the Internet at www1.phys.uu.nl/wwwgf. The doctoral thesis was defended on 27 February 2002. Mr Stannowski’s supervisors were Prof. R.E.I. Schropp and Prof. W.F. van der Weg.
Michel Philippens | alphagalileo
Stable magnetic bit of three atoms
21.09.2017 | Sonderforschungsbereich 668
Drones can almost see in the dark
20.09.2017 | Universität Zürich
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems Holding GmbH about commercial use of a multi-well tissue plate for automated and reliable tissue engineering & drug testing.
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
21.09.2017 | Life Sciences
21.09.2017 | Health and Medicine
21.09.2017 | Earth Sciences