Details

Autor(en) / Beteiligte

• Salcedo, Guillermo A.
• Islam, Ahmad E.
• Reichley, Elizabeth
• Dietz, Michael
• Schubert-Kabban, Christine M.
• Leedy, Kevin D.
• Back, Tyson C.
• Wang, Weisong
• Green, Andrew
• Wolfe, Timothy
• Sattler, James M.

Titel

Effect of fabrication parameters on the ferroelectricity of hafnium zirconium oxide films: A statistical study

Ist Teil von

• Journal of applied physics, 2024-03, Vol.135 (12)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2024

Link zum Volltext

Quelle

AIP Journals

Beschreibungen/Notizen

• Ferroelectricity in hafnium zirconium oxide (Hf1 −xZrxO2) and the factors that impact it have been a popular research topic since its discovery in 2011. Although the general trends are known, the interactions between fabrication parameters and their effect on the ferroelectricity of Hf1 −xZrxO2 require further investigation. In this paper, we present a statistical study and a model that relates Zr concentration (x), film thickness (tf), and annealing temperature (Ta) with the remanent polarization (Pr) in tungsten (W)-capped Hf1 −xZrxO2. This work involved the fabrication and characterization of 36 samples containing multiple sets of metal-ferroelectric-metal capacitors while varying x (0.26, 0.48, and 0.57), tf (10 and 19 nm), and Ta (300, 400, 500, and 600  °C). In addition to the well-understood effects of x and Ta on the ferroelectricity of Hf1 −xZrxO2, the statistical analysis showed that thicker Hf1 −xZrxO2 films or films with higher x require lower Ta to crystallize and demonstrated that there is no statistical difference between samples annealed to 500 and 600  °C, thus suggesting that most films fully crystallize with Ta  ∼ 500  °C for 60 s. Our model explains 95% of the variability in the Pr data for the films fabricated, presents the estimates of the phase composition of the film, and provides a starting point for selecting fabrication parameters when a specific Pr is desired.