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Amorphous Si TFTs on plastically deformed spherical domes

Hsu, P. I. and Gleskova, H. and Huang, M. and Suo, Z. and Wagner, S. and Sturm, J. C. (2002) Amorphous Si TFTs on plastically deformed spherical domes. Journal of Non-Crystalline Solids, 299-302 (Part 2). pp. 1355-1359. ISSN 0022-3093

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Abstract

There is a growing interest in the design and fabrication of flexible and rugged electronics particularly for large-area displays and sensor arrays. In this work, we describe the fabrication of amorphous silicon (a-Si:H) thin film transistors (TFTs) on a Kapton substrate which can be permanently deformed into a spherical cap shape. This level of strain would crack uniform a-Si:H device films. To prevent fractures in our TFT structure, the silicon and silicon nitride layers of the TFTs are patterned to create isolated device islands. After deformation, these brittle islands can remain crack-free, and the TFTs achieve comparable device behavior despite average strain in the substrate in excess of 5%.