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- W2109426683 abstract "We report on the piezoresistive characterization of various silicon materials, including low-doped (n = 1016 cm−3) crystalline (c-Si), polycrystalline (poly-Si), and nanocrystalline (nc-Si) specimens. The employed wafer-scale microtensile technique enables the acquisition of linear and nonlinear piezoresistance coefficients. In contrast to previous studies where nonlinear coefficients were obtained for strains up to only 0.2%, the data presented here are extracted up to the fracture strain of about 1%, leading to more reliable higher-order piezoresistive parameters. Longitudinal and transverse resistance measurements of the specimen regions under uniform stress are realized during sample mechanical loading. Relative resistivity changes Δρ/ρ of up to −12.6, −36, and −40% are found for longitudinal resistance measurements at specimen fracture stresses of 1.4, 1.4, and 2.1 GPa for poly-Si and c-Si aligned with and -directions, respectively. Non-monotonic characteristics with maximal resistivity changes of −16% and 11.5% are found for transverse resistance measurements on c-Si along the and -directions, respectively. The nonlinear behaviour of c-Si is modeled by a fourth order polynomial, while a second order polynomial sufficiently fits the poly-Si data. Such findings are particularly relevant for the application of these materials in piezoresistive sensing devices subjected to relatively large stress levels." @default.
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- W2109426683 date "2010-11-01" @default.
- W2109426683 modified "2023-09-26" @default.
- W2109426683 title "Nonlinear piezoresistance of silicon" @default.
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- W2109426683 doi "https://doi.org/10.1109/icsens.2010.5689973" @default.
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