The unexpected superior switching performance (low leakage current, and steep sub-threshold slope) shown experimentally and analysed theoretically, demonstrate hitherto unexplored routes for improvements for transistors based on disordered silicon films.
By making the conduction channel in these disordered transistors very thin, the team has shown this technology will enable the design of low power memory for large area electronics based on a low-cost industry standard material processing route.
In the most recent investigations, the current of the devices, is found to be percolation governed when the channel is thinner than 3.0 nm due to strong quantum confinement induced potential variations over the active channel region. It is shown that the device channel width must be at least 0.3 µm to avoid percolative “pinch off” for 0.5 µm channel length devices. Theoretical analysis performed on the devices agrees well with the experimental data and provides important guidelines to model and optimize the devices for circuit design.
Dr Xiaojun Guo, one of the lead investigators, comments: “The nano-structure silicon thin-film transistors are very promising for design of low power electronics. However, carrier transport in such devices is very complicated, and results in electrical characteristics that may not be described by conventional field effect transistor (FET) models. This work reveals the key physical properties of the devices, which will help to further optimize and model the devices for circuit design”.
Professor Ravi Silva, Director of the Advanced Technology Institute adds: “This study is a prime example of how leading silicon technologies entrenched in industry can find alternative routes to improve on performance in device characteristics by clever design. The role that funding organizations such as EPSRC play in supporting this type of applied research is invaluable to the community and most importantly to industry”.The results are published in Applied Physics Letters 93 (2008) 042105.
Stuart Miller | alfa
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Satellites in near-Earth orbit are at risk due to the steady increase in space debris. But their mission in the areas of telecommunications, navigation or weather forecasts is essential for society. Fraunhofer FHR therefore develops radar-based systems which allow the detection, tracking and cataloging of even the smallest particles of debris. Satellite operators who have access to our data are in a better position to plan evasive maneuvers and prevent destructive collisions. From April, 25-29 2018, Fraunhofer FHR and its partners will exhibit the complementary radar systems TIRA and GESTRA as well as the latest radar techniques for space observation across three stands at the ILA Berlin.
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In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.
Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.
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A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...
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