Key Takeaways & Executive Findings
- •• Structural optimization of floating gate dimensions and active area profile expands control gate-to-active area corner distance by 22%, suppressing peak electric fields by 29% vertically and 18% horizontally. • The optimized NOR flash cell achieves 100× reduction in early-cycle burnout failures and 7.38× improvement in time dependent dielectric breakdown lifetime. • Programming and erasing speeds are accelerated by 15.4% and 7.3%, respectively, while data retention is maintained. • The enhanced reliability enables a 97.5% reduction in Fowler-Nordheim stress time during characterization program testing, offering a cost-effective solution for automotive-grade flash memories.
Abstract
Along with NOR flash cell scaling down, dielectric burnout has gradually become one of the most important factors which affects product reliability, especially for high dropout voltage films. In this study, we demonstrate a reliability-enhanced NOR flash cell in 50 nm node technology through structural optimization of floating gate (FG) dimensions and active area profile. By synergistically increasing FG thickness, reducing FG width, and tuning cell-open depth, the control gate-to-active area corner distance expands by 22%, suppressing peak electric fields by 29% vertically and 18% horizontally. This structural innovation achieves: (1) 100× reduction in early-cycle burnout failures, (2) 7.38× time dependent dielectric breakdown lifetime improvement, while maintaining data retention and accelerating programming/erasing speeds by 15.4%/7.3%. The enhanced reliability enables 97.5% reduction in Fowler−Nordheim stress time during characterization program testing, providing a cost-effective solution for automotive-grade flash memories.
1. Introduction
NOR flash memory, known for its high reliability and fast random access, has become a critical component in IoT, 5G, automotive electronics, and aerospace applications. As semiconductor technology advances, the scaling of NOR flash to the 50 nm node represents the cutting edge of non-volatile memory technology. This node not only enables higher integration density and faster performance but also meets the rigorous demands of modern applications, such as real-time processing and extreme environmental conditions. However, this technological progression intensifies a critical commercialization barrier: dielectric reliability degradation. Key parameters for evaluating NOR flash memory include data retention, cell anti-breakdown capability, and resistance to ionizing radiation. Scaling down induced failures, particularly dielectric burnout, transition reliability challenges from purely technical challenges to determinants of commercial viability. In automotive and aerospace industries that require defect-free certification, even marginal yield reductions escalate production costs exponentially. This directly undermines the cost-performance benefits enabled by node scaling.
Fig. 1(a) illustrates the schematic structure of a NOR flash cell, consisting of monocrystalline silicon (AA), tunnel oxide, polycrystalline silicon (floating gate, FG), ONO (oxide, nitride, oxide), and polycrystalline silicon (control gate, CG). The reliability challenges stem from the intrinsic physical mechanisms of NOR flash operations. Programming and erasing (P/E) cycles require high electric fields to impart sufficient energy for electrons to enter or escape the floating gate.
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Kevin Fang, Wei Wang, Yibai Xue, Fan Wang, Dong Pan, Yi Li, Jerry Zhou (2025). A high reliability NOR flash cell in 50 nm node technology. SinoTechIntel Verified Research. https://doi.org/10.1088/1674-4926/25030030
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Frequently Asked Questions
What is the main contribution of this paper?
The paper demonstrates a reliability-enhanced NOR flash cell in 50 nm node technology through structural optimization of floating gate dimensions and active area profile, achieving significant improvements in burnout failure reduction, dielectric breakdown lifetime, and programming/erasing speeds.
How does the structural optimization improve reliability?
By increasing FG thickness, reducing FG width, and tuning cell-open depth, the control gate-to-active area corner distance expands by 22%, which suppresses peak electric fields by 29% vertically and 18% horizontally, thereby reducing dielectric burnout.
What are the quantitative improvements reported?
The optimized cell achieves 100× reduction in early-cycle burnout failures, 7.38× improvement in time dependent dielectric breakdown lifetime, and 15.4%/7.3% faster programming/erasing speeds, while maintaining data retention.
What is the significance of the 97.5% reduction in Fowler-Nordheim stress time?
The reduction in Fowler-Nordheim stress time during characterization program testing indicates enhanced reliability and provides a cost-effective solution for automotive-grade flash memories, as it reduces testing time and associated costs.
What applications are targeted by this technology?
The enhanced reliability makes the NOR flash cell suitable for automotive and aerospace applications, where high reliability and defect-free certification are critical.
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