Using Templates to Conquer Disorder @ Cornell University

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November 8, 2006

Engineers have long dreamed of making inexpensive electronics out of thin films of organic materials, such as plastics. This dream has been met by a significant challenge —disorder. Organic films are typically composed of tiny crystals. Although each crystal is perfect, the molecules in one crystal are aligned in a different direction than those in the next crystal. This random order impedes the flow of electricity and leads to poor performance.<br /> To improve organic films, we use the atomic steps on a silicon surface as a template. As shown in the figures at right, the organic crystals grow out from the steps, creating a degree of order. We are currently testing these crystals to see whether this order extends to the molecular scale. If so, this technique could provide a new route to high performance organic transistors.<br /> Valerian Ignatescu and Jack Blakely