Thickness scaling of pyroelectric response in thin ferroelectric Hf 1-xZr xO2 films

Smith, Sean W.; Henry, M. David; Brumbach, Michael T.; Rodriguez, Mark A.; Ihlefeld, Jon F.

doi:10.1063/1.5045635

Title: Thickness scaling of pyroelectric response in thin ferroelectric Hf _1-_xZr _xO₂ films

Journal Article · 01 November 2018 · Applied Physics Letters

DOI: https://doi.org/10.1063/1.5045635 · OSTI ID:1483977

Smith, Sean W. ^[1]; Henry, M. David ^[1]; Brumbach, Michael T. ^[1]; Rodriguez, Mark A. ^[1];

^[2]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Virginia, Charlottesville, VA (United States). Department of Materials Science and Engineering and Charles L. Brown Department of Electrical and Computer Engineering

In this study, the scaling of polarization and pyroelectric response across a thickness series (5–20 nm) of Hf_0.58Zr_0.42O₂ films with TaN electrodes was characterized. Reduction in thickness from 20 nm to 5 nm resulted in a decreased remanent polarization from 17 to 2.8 μC cm^-2. Accompanying the decreased remanent polarization was an increased absolute pyroelectric coefficient, from 30 to 58 μC m^-2 K^-1. The pyroelectric response of the 5 nm film was unstable and decreased logarithmically with time, while that of 10 nm and thicker films was stable over a time scale of >300 h at room temperature. Finally, the sign of the pyroelectric response was irreversible with differing polarity of poling bias for the 5 nm thick film, indicating that the enhanced pyroelectric response was of electret origins, whereas the pyroelectric response in thicker films was consistent with a crystallographic origin.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1483977

Report Number(s):: SAND--2018-12973J; 669783

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 18 Vol. 113; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Analytical description of the size effect on pyroelectric and electrocaloric properties of ferroelectric nanoparticles Morozovska, Anna N.; Eliseev, Eugene A.; Glinchuk, Maya D. Physical Review Materials, Vol. 3, Issue 10 https://doi.org/10.1103/physrevmaterials.3.104414	journal	October 2019
Analytical description of the size effect on pyroelectric and electrocaloric properties of ferroelectric nanoparticles Morozovska, Anna N.; Eliseev, Eugene A.; Glinchuk, Maya D. arXiv https://doi.org/10.48550/arxiv.1906.02953	text	January 2019

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