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- W3003243997 abstract "The in-plane piezoelectric response of 20 nm thick Si-doped HfO2 is examined by exploiting thermal expansion of the substrate upon rapid temperature cycling. The sample is heated locally by a deposited metal film, and the subsequently registered pyroelectric current is found to be frequency dependent in the observed range of 5 Hz to 35 kHz. While the intrinsic response remains constant, the secondary contribution can be switched off in the high-frequency limit due to substrate clamping. As this secondary response is generated by thermal expansion and the piezoelectric effect, this allows for extraction of the corresponding in-plane response. By comparing pyroelectric measurements in low- and high-frequency limits, a piezoelectric coefficient d31 of −11.5 pm V −1 is obtained, which is more than five times larger than that of AlN. The magnitude of piezoelectric response increases upon electric field cycling, which is associated with a transition from antiferroelectric-like behavior to a purely ferroelectric polarization hysteresis. The hafnium oxide material system is proposed as a promising candidate for future CMOS compatible piezoelectric micro- and nano-electromechanical systems (MEMS and NEMS)." @default.
- W3003243997 created "2020-02-07" @default.
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- W3003243997 date "2020-01-29" @default.
- W3003243997 modified "2023-10-15" @default.
- W3003243997 title "Piezoelectric Response of Polycrystalline Silicon‐Doped Hafnium Oxide Thin Films Determined by Rapid Temperature Cycles" @default.
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- W3003243997 doi "https://doi.org/10.1002/aelm.201901015" @default.
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