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arxiv: 2604.20698 · v1 · submitted 2026-04-22 · ❄️ cond-mat.mtrl-sci

Engineering Wake-Up-Free Ferroelectric Capacitors with Enhanced High-Temperature Reliability

Nashrah Afroze , Salma Soliman , Yu-Hsin Kuo , Sanghyun Kang , Mengkun Tian , Priyankka Ravikumar , Andrea Padovani , Asif Khan This is my paper

Pith reviewed 2026-05-09 23:45 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords HZO ferroelectricwake-up free switchinghigh temperature endurancePE-ALDtungsten bottom electrodeinterfacial oxidationferroelectric capacitors3D integration
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The pith

PE-ALD HZO capacitors on tungsten bottom electrodes achieve wake-up-free switching up to 125C with improved endurance.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper systematically tests thermal and plasma-enhanced ALD for HZO films on tungsten and titanium nitride bottom electrodes to find combinations that work reliably at high temperatures. It establishes that plasma-enhanced ALD HZO on tungsten produces capacitors that switch without a wake-up period up to 125C and show much better endurance than thermal ALD versions from 85C to 125C. This matters for building ferroelectric memory in stacked 3D chips where processing heats the layers and devices must endure high temps without failure or needing initial conditioning. The study separates the plasma effect from the bottom interface to show the oxidized tungsten layer drives most of the improvement. It also notes that the same plasma method on titanium nitride fails to help and can hurt performance, leading to guidelines on pairing deposition methods with specific electrodes.

Core claim

PE-ALD HZO capacitors integrated with W BE exhibit wake-up-free switching up to 125C, along with significantly improved endurance compared to Th-ALD HZO/W devices across a wide temperature range (85-125C). By decoupling the contributions of the plasma-deposited HZO film and the oxidized bottom interface, the oxidized W interfacial layer (WOx) is identified as the primary factor governing endurance enhancement and wake-up suppression at elevated temperatures, while the PE-ALD HZO film provides secondary benefits. In contrast, PE-ALD HZO on TiN shows no substantial improvement in wake-up behavior or endurance and instead exhibits degraded polarization because oxidized TiN is less effective.

What carries the argument

The oxidized tungsten interfacial layer (WOx) formed during PE-ALD, which acts as the primary driver for suppressing wake-up and enhancing endurance in HZO capacitors at high temperatures.

If this is right

  • PE-ALD HZO enables superior high-temperature ferroelectric performance only when used with W bottom electrodes.
  • Th-ALD HZO remains viable for high-temperature operation when paired with TiN bottom electrodes.
  • The interplay of deposition technique, electrode chemistry, and interfacial oxidation determines device reliability.
  • These results provide design guidelines for ferroelectric memory integration in monolithic 3D systems under thermal constraints.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Interface engineering with oxidized tungsten could be adapted to other ferroelectric oxides or memory architectures for broader high-temperature applications.
  • Electrode material selection may outweigh deposition method choices in optimizing thermal stability for ferroelectric devices.
  • Validating these single-capacitor results in dense memory arrays would reveal any additional scaling or integration effects not captured here.

Load-bearing premise

The unintentional interfacial layers formed during PE-ALD on W and TiN are under comparable oxidation conditions, allowing direct attribution of performance differences to electrode chemistry rather than variations in oxidation extent or other process factors.

What would settle it

Preparing HZO capacitors on W and TiN where the interfacial oxide layers have been engineered to have identical thickness and composition, then checking if the wake-up and endurance advantages of the W devices disappear.

Figures

Figures reproduced from arXiv: 2604.20698 by Andrea Padovani, Asif Khan, Mengkun Tian, Nashrah Afroze, Priyankka Ravikumar, Salma Soliman, Sanghyun Kang, Yu-Hsin Kuo.

Figure 1
Figure 1. Figure 1: (a) Schematic representation of the temperature profile of an advanced [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Device structures of ferroelectric capacitors with W (a-b) and TiN [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: STEM image of PE-HZO devices with W (a) and TiN (b) bottom [PITH_FULL_IMAGE:figures/full_fig_p002_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: P-V and Isw-V of Th-HZO/W (a-d) and PE-HZO/W (e-h) devices at pristine state measured at 25°, 65°, 85°and 105°C respectively. oxidation of the bottom electrode, as evidenced in [PITH_FULL_IMAGE:figures/full_fig_p003_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: P-V and Isw-V of Th-HZO/W (a) and PE-HZO/W (b) at 105°C [PITH_FULL_IMAGE:figures/full_fig_p003_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Increase in polarization after 105 cycles compared to pristine state at different temperatures [PITH_FULL_IMAGE:figures/full_fig_p004_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: (a) Write endurance scheme. Note that applying ±1.8V leads to complete polarization switching (Fig. 4). (b-i) 2P [PITH_FULL_IMAGE:figures/full_fig_p005_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Average cycles to breakdown (CBD) vs temperature for Th-HZO/W (black), PE-HZO/TiN (magenta) and WOx inserted Th-HZO/W (gray) devices for 1.8V (a) and 2V (b) bipolar cycling. The dashed lines represent least￾squares linear fits to the log10-transformed data. polarization compared to the Th-HZO/TiN device ( [PITH_FULL_IMAGE:figures/full_fig_p005_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: P-V and Isw-V of Th-HZO/TiN (a-d) and PE-HZO/TiN (e-h) devices at pristine state measured at 25°, 65°, 85°and 105°C respectively. enhancement, no significant improvement in endurance is observed in PE-HZO/TiN devices. These observations are consistent with the trends identified in W BE devices, where the oxidized bottom interface plays a key role in enhancing endurance at elevated temperatures, while the P… view at source ↗
Figure 11
Figure 11. Figure 11: Average cycles to breakdown (CBD) vs temperature for Th-HZO/TiN (blue), PE-HZO/TiN (brown) and Th-HZO/TiN with oxidized BE (gray) devices for 1.8V (a) and 2V (b) bipolar cycling. The dashed lines represent least-squares linear fits to the log10-transformed data. HZO film itself contributes to suppressed wake-up behavior and enhanced polarization magnitude only when deposited on a W BE. This underscores th… view at source ↗
Figure 10
Figure 10. Figure 10: P-V and Isw-V of Th-HZO/TiN (a) and PE-HZO/TiN (b) at 125°C [PITH_FULL_IMAGE:figures/full_fig_p006_10.png] view at source ↗
Figure 12
Figure 12. Figure 12: Spider plot showing comparison of 2Pr at room temperature (RT), room temperature (RT) endurance for 1.8V bipolar cycling, endurance at 125°C for 1.8V bipolar cycling and cycles needed for wakeup at 125°C between Th-HZO and PE-HZO devices with W BE (a) and TiN BE (b). ACKNOWLEDGEMENT This work was supported by SUPREME, one of the seven SRC-DARPA JUMP 2.0 centers. Fab was done at the IMS, supported by the N… view at source ↗
read the original abstract

We systematically explore the design space of ferroelectric hafnium-zirconium oxide (H0.5Z0.5O or HZO) heterostructures for reliable high temperature operation. HZO films are deposited using thermal and plasma-enhanced atomic layer deposition (Th-ALD and PE-ALD) on tungsten (W) and titanium nitride (TiN) bottom electrodes (BE), while maintaining identical top electrodes. We demonstrate that PE-ALD HZO capacitors integrated with W BE exhibit wake-up-free switching up to 125C, along with significantly improved endurance compared to Th-ALD HZO/W devices across a wide temperature range (85-125C). By decoupling the contributions of the plasma-deposited HZO film and the oxidized bottom interface inherently formed during PE-ALD, we identify the oxidized W interfacial layer (WOx) as the primary factor governing endurance enhancement and wake-up suppression at elevated temperatures, while the PE-ALD HZO film provides secondary benefits in reducing wake-up. In contrast, PE-ALD HZO capacitors fabricated on TiN BE show no substantial improvement in wake-up behavior or endurance relative to Th-ALD HZO/TiN devices, despite the formation of an unintentional TiOxNy interfacial layer, and instead exhibit degraded polarization. This difference arises from the significantly weaker endurance enhancement and no wake-up suppression provided by oxidized TiN compared to oxidized W under comparable oxidation conditions. Overall, PE-ALD HZO films enable superior ferroelectric performance at elevated temperatures only when deposited on W BE, while Th-ALD HZO films remain a viable option for high temperature operation on TiN BE. These findings clarify the interplay between deposition technique, electrode chemistry, and interfacial oxidation, and provide design guidelines for integrating ferroelectric memories into monolithic 3D systems under stringent thermal constraints.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript reports an experimental comparison of thermal ALD (Th-ALD) and plasma-enhanced ALD (PE-ALD) HZO ferroelectric films deposited on W and TiN bottom electrodes (with identical top electrodes). It claims that PE-ALD HZO/W capacitors exhibit wake-up-free switching up to 125°C and significantly improved endurance (85–125°C) relative to Th-ALD HZO/W devices, attributing the gains primarily to the unintentionally formed WOx interfacial layer; PE-ALD HZO/TiN devices show no endurance or wake-up benefit (and degraded polarization) due to weaker TiOxNy. The work decouples film versus interface contributions and offers design guidelines for high-temperature ferroelectric integration in 3D systems.

Significance. If the central attribution holds, the results would be significant for FeRAM reliability in monolithic 3D integration under thermal budgets, as they identify electrode-specific interfacial oxidation as a lever for suppressing wake-up and extending endurance at elevated temperatures. The systematic electrode/deposition matrix and attempt to isolate interface effects are positive features of the experimental design.

major comments (3)
  1. [Abstract and results/discussion] Abstract and results/discussion sections: The central claim that the oxidized W interfacial layer (WOx) is the primary factor for endurance enhancement and wake-up suppression (while TiOxNy provides weaker effects) rests on the assertion of 'comparable oxidation conditions' during the same PE-ALD process on W versus TiN. No quantitative metrics (e.g., TEM-measured thickness, XPS oxidation states, or equivalent oxygen dose) are provided to confirm that the unintentional interfacial layers experience equivalent oxidation extent; differential reactivity could produce thicker or more defective WOx, confounding chemistry with oxidation degree.
  2. [Results] Results section (endurance and polarization data): The reported improvements in endurance and wake-up behavior lack accompanying statistics, error bars, device-to-device variation, or number of measured capacitors. This omission prevents evaluation of whether the differences between PE-ALD HZO/W and Th-ALD HZO/W (or the lack of benefit on TiN) are statistically robust and undermines the strength of the decoupling argument.
  3. [Methods and results] Methods and results sections on decoupling: The separation of contributions from the PE-ALD HZO film versus the oxidized bottom interface is central to identifying WOx as primary. However, the manuscript does not describe explicit control experiments (e.g., post-deposition interface engineering or thickness-varied controls) that would isolate these factors beyond the electrode comparison, leaving the secondary role assigned to the film insufficiently substantiated.
minor comments (2)
  1. [Abstract] Abstract: Notation 'H0.5Z0.5O' should be corrected to the conventional Hf0.5Zr0.5O2 (HZO) formula for clarity.
  2. [Figures] Figure captions and text: Ensure all endurance and P-E loop plots include temperature labels, cycle counts, and scale bars where relevant; some comparisons would benefit from overlaid reference curves for direct visual assessment.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive and detailed comments, which have helped us improve the clarity and rigor of our manuscript. We address each major comment point by point below and indicate the revisions made.

read point-by-point responses

  1. Referee: [Abstract and results/discussion] Abstract and results/discussion sections: The central claim that the oxidized W interfacial layer (WOx) is the primary factor for endurance enhancement and wake-up suppression (while TiOxNy provides weaker effects) rests on the assertion of 'comparable oxidation conditions' during the same PE-ALD process on W versus TiN. No quantitative metrics (e.g., TEM-measured thickness, XPS oxidation states, or equivalent oxygen dose) are provided to confirm that the unintentional interfacial layers experience equivalent oxidation extent; differential reactivity could produce thicker or more defective WOx, confounding chemistry with oxidation degree.

    Authors: We agree that quantitative metrics would strengthen the claim of comparable oxidation conditions. In the revised manuscript, we will add cross-sectional TEM images and XPS analysis (including oxidation state profiles) for the interfacial layers formed during PE-ALD on both W and TiN electrodes. These data will quantify layer thicknesses and confirm that the oxidation extents are similar, allowing us to attribute performance differences primarily to the distinct chemistry of WOx versus TiOxNy rather than differences in oxidation degree. revision: yes

  2. Referee: [Results] Results section (endurance and polarization data): The reported improvements in endurance and wake-up behavior lack accompanying statistics, error bars, device-to-device variation, or number of measured capacitors. This omission prevents evaluation of whether the differences between PE-ALD HZO/W and Th-ALD HZO/W (or the lack of benefit on TiN) are statistically robust and undermines the strength of the decoupling argument.

    Authors: We acknowledge the importance of statistical robustness. The revised manuscript now includes error bars on all relevant endurance and polarization plots, calculated as standard deviation from measurements on a minimum of 8–10 devices per condition. The methods section and figure captions have been updated to explicitly state the number of capacitors measured and to discuss observed device-to-device variation, thereby supporting the reliability of the reported differences. revision: yes

  3. Referee: [Methods and results] Methods and results sections on decoupling: The separation of contributions from the PE-ALD HZO film versus the oxidized bottom interface is central to identifying WOx as primary. However, the manuscript does not describe explicit control experiments (e.g., post-deposition interface engineering or thickness-varied controls) that would isolate these factors beyond the electrode comparison, leaving the secondary role assigned to the film insufficiently substantiated.

    Authors: The core decoupling strategy relies on depositing identical PE-ALD HZO films on W versus TiN bottom electrodes under the same process conditions, thereby holding film properties constant while varying only the interfacial chemistry due to electrode-specific oxidation. This matrix directly isolates the interface contribution. In the revision, we will expand the discussion section to explicitly articulate this decoupling logic, its assumptions, and limitations. While additional post-deposition controls (e.g., engineered interfaces) were not performed and would provide further substantiation, the existing electrode comparison provides direct evidence that the oxidized W interface is the dominant factor; we note this as a direction for future work. revision: partial

Circularity Check

0 steps flagged

No circularity: pure experimental comparisons with no derivations or fitted predictions

full rationale

The paper reports direct experimental measurements of ferroelectric capacitors fabricated via Th-ALD and PE-ALD on W and TiN electrodes, including endurance, polarization, and wake-up data across 85-125°C. Claims rest on observed differences in device performance and attribution to interfacial layers (WOx vs TiOxNy) via process comparisons, without any equations, models, or 'predictions' that reduce to fitted inputs. No self-citations are load-bearing for the central results; the work is self-contained against its own fabricated devices and measurements.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

This experimental materials engineering paper introduces no free parameters, invented entities, or ad-hoc axioms beyond standard domain assumptions in ferroelectric device testing.

axioms (1)
  • domain assumption Wake-up effect and endurance can be assessed through repeated polarization-voltage hysteresis measurements at controlled temperatures.
    This is a standard assumption in all ferroelectric capacitor characterization studies.

pith-pipeline@v0.9.0 · 5660 in / 1388 out tokens · 70469 ms · 2026-05-09T23:45:05.284253+00:00 · methodology

discussion (0)

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Reference graph

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