Related Experiment Video
Updated: May 16, 2025
06:56
Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
Published on: May 23, 2017
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Low-Frequency Noise Spectroscopy for Navigating Geometrically Varying Strain Effects in HfO2 Ferroelectric FETs
Ryun-Han Koo1, Wonjun Shin2,3, Sangwoo Kim4
1Department of Electrical and Computer Engineering and Inter-university Semiconductor Research Center, Seoul National University, Seoul, 08826, Republic of Korea.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 2, 2025
Summary
Strain engineering in hafnium oxide ferroelectric field-effect transistors (FeFETs) can enhance ferroelectricity but may damage interfaces. This study reveals a unique reverse scaling effect in noise characteristics due to strain-induced interface damage.
Area of Science:
- Materials Science
- Solid-State Physics
- Device Engineering
Background:
- Strain engineering is crucial for tuning ferroelectric properties in hafnium oxide (HfO₂) thin films.
- Integrating strain-induced ferroelectricity into field-effect transistors (FETs) necessitates understanding geometrical factors and interfaces.
Purpose of the Study:
- To investigate the impact of strain on HfO₂-based ferroelectric FETs (FeFETs) with poly-Si channels.
- To analyze strain-induced effects on channel interfaces and device performance using low-frequency noise (LFN) spectroscopy.
Main Methods:
- Utilized low-frequency noise (LFN) spectroscopy to probe strain effects in poly-Si FeFETs.
- Analyzed the influence of strain during post-metal annealing on channel interface quality and device geometry.
Main Results:
- Strain introduces channel interface damage, with severity dependent on device geometry.
- Observed a 'reverse scaling effect' where noise increases with channel length, contrary to conventional FETs.
- Increased strain enhances ferroelectricity but degrades electrical performance due to interface damage.
Conclusions:
- Strain engineering critically impacts FeFET performance and reliability.
- Guidelines are provided for optimizing strain effects to balance ferroelectricity and device integrity in future FeFET designs.
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