Microcrystalline silicon: Strain gauge and sensor arrays on flexible substrate for the measurement of high deformationsReportar como inadecuado




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* Corresponding author 1 IETR - Institut d-Electronique et de Télécommunications de Rennes 2 Maison de la Technopole Laval

Abstract : This paper presents strain sensor arrays on flexible substrates able to measure local deformation induced by radii of curvature of few millimeters. Sensors use n-type doped microcrystalline silicon μc-Si as piezoresistive material, directly deposited on polyimide sheets at 165 °C. Sensitivity of individual sensors was investigated under tensile and compressive bending at various radii of curvature, down to 5 mm. A Transmission Line Method was used to extract the resistivity for each radius. The devices exhibited longitudinal gauge factors of −31 and longitudinal piezoresistive coefficients of −4.10−10 Pa−1. Reliability was demonstrated with almost unchanged resistances after cycles of bending standard deviation of 1.7%. Strain gauge arrays, composed of 800 resistors on a 2 cm2 area, were fabricated with a spatial resolution of 500 × 500 μm2. Strain mapping showed the possibility to detect local deformation on a single resistor or to detect larger objects. These strain sensor arrays can find applications when high sensitivity and high spatial resolution is required. This paper also showed that μc-Si can be a relevant semi-conductor candidate for flexible electronics

Keywords : Flexible substrate High spatial resolution arrays Microcrystalline silicon Strain gauge arrays





Autor: Y. Kervran - O. De Sagazan - S. Crand - N. Coulon - T. Mohammed-Brahim - O Brel -

Fuente: https://hal.archives-ouvertes.fr/



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