Piezoresistive response of ITO films deposited at room temperature by magnetron sputtering |
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Authors: | L A Rasia R D Mansano L R Damiani and C E Viana |
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Affiliation: | (1) Laborat?rio de Sistemas Integr?veis da Escola Polit?cnica da Universidade de S?o Paulo - LSI/PSI/EPUSP, Av. Prof. Luciano Gualberto, 158 - Travessa 3, 05508-900 Sao Paulo, Brazil |
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Abstract: | Indium tin oxide (ITO) thin films have been deposited on (100) Si substrates by RF magnetron sputtering from a compact target
(90% In2O3–10% SnO2 in weight) with 6 in. in diameter. In order to perform electromechanical characterizations of these films, strain gauges
were fabricated. An experimental set-up based on bending beam theory was developed to determine the longitudinal piezoresistive
coefficient (πl) of the strain gauges fabricated. It has been confirmed that electrical resistance of the strain gauges decreases with load
increases which results a negative gauge factor. A model based on the activation energy was used to explain the origin of
this negative signal. The influence of the temperature on piezoresistive properties of ITO films was also evaluated. |
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