From Doping to Dilution : Local Chemistry and Collective Interactions of La in HfO2

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2022
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Baumgarten, Lutz
Richter, Claudia
Matveyev, Yury
Schlueter, Christoph
Mikolajick, Thomas
Schroeder, Uwe
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Physica Status Solidi (RRL) - Rapid Research Letters. Wiley. 2022, 16(10), 2100582. ISSN 1862-6254. eISSN 1862-6270. Available under: doi: 10.1002/pssr.202100582
Zusammenfassung

Lanthanum (La) doping is considered as a promising route to overcome reliability issues of switchable ferroelectric HfO2-based devices. This study links the local chemistry at the La lattice sites with local and collective electronic properties of the La:HfO2 matrix using hard X-ray photoelectron spectroscopy. The satellite structure of the La 3d core level, the plasmonic excitation energies, and core-level rigid binding energy shifts are investigated for La:HfO2 samples with a wide range of La doping, ranging from 3.5% to 33%, i.e., from the doping to dilution level. The emerging chemical phases and electronic properties are discussed as a function of La content. From the evolution of the plasmon excitation energies and rigid binding energy shifts, it is concluded that electronic charge compensation by oxygen vacancies occurs for increasing La content.

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ISO 690SZYJKA, Thomas, Lutz BAUMGARTEN, Oliver REHM, Claudia RICHTER, Yury MATVEYEV, Christoph SCHLUETER, Thomas MIKOLAJICK, Uwe SCHROEDER, Martina MÜLLER, 2022. From Doping to Dilution : Local Chemistry and Collective Interactions of La in HfO2. In: Physica Status Solidi (RRL) - Rapid Research Letters. Wiley. 2022, 16(10), 2100582. ISSN 1862-6254. eISSN 1862-6270. Available under: doi: 10.1002/pssr.202100582
BibTex
@article{Szyjka2022-11Dopin-56915,
  year={2022},
  doi={10.1002/pssr.202100582},
  title={From Doping to Dilution : Local Chemistry and Collective Interactions of La in HfO<sub>2</sub>},
  number={10},
  volume={16},
  issn={1862-6254},
  journal={Physica Status Solidi (RRL) - Rapid Research Letters},
  author={Szyjka, Thomas and Baumgarten, Lutz and Rehm, Oliver and Richter, Claudia and Matveyev, Yury and Schlueter, Christoph and Mikolajick, Thomas and Schroeder, Uwe and Müller, Martina},
  note={Article Number: 2100582}
}
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