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000481023 1001_ $$0P:(DE-H253)PIP1087957$$aChouprik, Anastasia$$b0$$eCorresponding author
000481023 245__ $$aNanoscale Doping and Its Impact on the Ferroelectric and Piezoelectric Properties of Hf$_{0.5}$Zr$_{0.5}$O$_2$
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000481023 520__ $$aFerroelectric hafnium oxide thin films—the most promising materials in microelectronics’ non-volatile memory—exhibit both unconventional ferroelectricity and unconventional piezoelectricity. Their exact origin remains controversial, and the relationship between ferroelectric and piezoelectric properties remains unclear. We introduce a new method to investigate this issue, which consists in a local controlled modification of the ferroelectric and piezoelectric properties within a single Hf$_{0.5}$Zr$_{0.5}$O$_2$ capacitor device through local doping and a further comparative nanoscopic analysis of the modified regions. By comparing the ferroelectric properties of Ga-doped Hf$_{0.5}$Zr$_{0.5}$O$_2$ thin films with the results of piezoresponse force microscopy and their simulation, as well as with the results of in situ synchrotron X-ray microdiffractometry, we demonstrate that, depending on the doping concentration, ferroelectric Hf$_{0.5}$Zr$_{0.5}$O$_2$ has either a negative or a positive longitudinal piezoelectric coefficient, and its maximal value is −0.3 pm/V. This is several hundreds or thousands of times less than those of classical ferroelectrics. These changes in piezoelectric properties are accompanied by either improved or decreased remnant polarization, as well as partial or complete domain switching. We conclude that various ferroelectric and piezoelectric properties, and the relationships between them, can be designed for Hf$_{0.5}$Zr$_{0.5}$O$_2$ via oxygen vacancies and mechanical-strain engineering, e.g., by doping ferroelectric films. 
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000481023 7001_ $$0P:(DE-H253)PIP1023128$$aKirtaev, Roman$$b1
000481023 7001_ $$0P:(DE-HGF)0$$aKorostylev, Evgeny$$b2
000481023 7001_ $$0P:(DE-H253)PIP1082197$$aMikheev, Vitalii$$b3
000481023 7001_ $$0P:(DE-HGF)0$$aSpiridonov, Maxim$$b4
000481023 7001_ $$0P:(DE-HGF)0$$aNegrov, Dmitrii$$b5
000481023 773__ $$0PERI:(DE-600)2662255-5$$a10.3390/nano12091483$$gVol. 12, no. 9, p. 1483 -$$n9$$p1483 $$tNanomaterials$$v12$$x2079-4991$$y2022
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