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arXiv · 2112.07992

Computational Associative Memory with Amorphous InGaZnO Channel 3D NAND-Compatible FG Transistors

Chen Sun·Chao Li·Subhranu Samanta·Kaizhen Han·Zijie Zheng·Jishen Zhang·Qiwen Kong·Haiwen Xu·Zuopu Zhou·Yue Chen·Cheng Zhuo·Kai Ni·Xunzhao Yin·Xiao Gong
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Abstract

3D NAND enables continuous NAND density and cost scaling beyond conventional 2D NAND. However, its poly-Si channel suffers from low mobility, large device variations, and instability caused by grain boundaries. Here, we overcome these drawbacks by introducing an amorphous indium-gallium-zinc-oxide (a-IGZO) channel, which has the advantages of ultra-low OFF current, back-end-of-line compatibility, higher mobility and better uniformity than poly-Si, and free of grain boundaries due to the amorphous nature. Ultra-scaled floating-gate (FG) transistors with a channel length of 60 nm are reported, achieving the highest ON current of 127 uA/um among all reported a-IGZO-based flash devices for high-density, low-power, and high-performance 3D NAND applications. Furthermore, a non-volatile and area-efficient ternary content-addressable memory (TCAM) with only two a-IGZO FG transistors is experimentally demonstrated. Array-level simulations using experimentally calibrated models show that this design achieves at least 240x array-size scalability and 2.7-fold reduction in search energy than 16T-CMOS, 2T2R, and 2FeFET TCAMs.

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Chen Sun, Chao Li, Subhranu Samanta, Kaizhen Han, Zijie Zheng, Jishen Zhang, Qiwen Kong, Haiwen Xu, Zuopu Zhou, Yue Chen, Cheng Zhuo, Kai Ni, Xunzhao Yin, Xiao Gong. 2021-12-15. Computational Associative Memory with Amorphous InGaZnO Channel 3D NAND-Compatible FG Transistors. https://doi.org/10.1002/aelm.202200643

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