Ryun-Han Koo, Wonjun Shin, Gyuweon Jung, Jangsaeng Kim, Sung-Tae Lee, Jiseong Im, Sung-Ho Park, Jonghyun Ko, Daewoong Kwon* and Jong-Ho Lee*,
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Strain–Stress Impact on Ferroelectric Devices: A Multilayer Analysis and Optimization Strategy for Neural Networks
We investigate the effects of strain stress on the hafnium zirconium oxide ferroelectric tunnel junctions (FTJs). The impact of strain stress on each layer of the FTJ is investigated depending on the thickness of the metal capping layer and the post-metal-annealing temperature. It is revealed that, for the insulator layer, an increase in strain lead to an increased off-current in the FTJs. In contrast, increased strain stress in the ferroelectric layer directly increases the trap density, leading to an increase in the on-current of the FTJs. Furthermore, we analyze how these strain-induced changes affect the performance and reliability of FTJs in neuromorphic systems. We propose optimization strategies for strain stress in FTJs based on the frequency of neural network updates, highlighting the critical balance between achieving a large dynamic range and ensuring device endurance, aligning device performance with the specific demands and conditions of neural network applications.
期刊介绍:
ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.