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smaller and finer structures that will go beyond conventional transistors to open up the possibility for more sophisticated devices that use electrons more like light than particles,” he said. “If we can factor quantum mechanical features into electronics, that is going to open up a lot of new possibilities.”


De Heer and his research team are now working to create smaller structures, and to integrate the graphene devices with silicon. The researchers are also working to improve the field-effect transistors with thinner dielectric materials.


Ultimately, graphene may be the basis for a generation of high-performance devices that will take advantage of the material’s unique properties in applications where the higher cost can be justified. Silicon will continue to be used in applications that don’t require such high performance, de Heer said.


“This is another step showing that our method of working with epitaxial graphene on silicon carbide is the right approach and the one that will probably be used for making graphene electronics,” he added. “This is a significant new step toward electronics manufacturing with graphene.”


In addition to those already mentioned, the research has involved M. Sprinkle, M. Ruan, Y Hu, J. Hankinson, M. Rubio-Roy, B. Zhang, X. Wu and C. Berger


Product News LEDs


Osram Opto’s LEDs Used in Tchibo Sustainable Coffee Bars


The ‘Dropled 100’ pendulum luminaires employ three OSLON SSL 80 LEDs and were chosen for their compact size and because they produce a lot of light within a small space.


‘insgrüne’ translated as ‘into nature’ is the name of Tchibo’s new coffee-bar concept for universities.


For the interior, designer Simon Brünner of ‘neuesLicht’ contributed matching pendulum luminaires. His ‘Dropled 100’, using Osram Opto Semiconductors’ OSLON SSL 80 LEDs, produces a light that is atmospherically pleasant. Furthermore, it is also economical and ecologically friendly thanks to the outstanding energy efficiency of the LEDs.


Image: Taken at Tchibo Coffee Shop and provided by Designer Simon Brünner


The coffee bars, to date opened at the German universities of Göttingen and Greifswald, are all- round ‘green’ in a number of different aspects: from their color design and fair-trade coffee to the sustainability of their lighting. Economical and at the same time powerful LEDs play a significant part in energy-saving lighting concepts.


The qualities of LEDs by Osram Opto’s have convinced Brünner that the 80° reflected beam


160 www.compoundsemiconductor.net November/December 2010


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