用于可靠无电容存储器的独立双栅 BEOL 晶体管的基于物理的紧凑模型

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Lihua Xu;Kaifei Chen;Zhi Li;Yue Zhao;Lingfei Wang;Ling Li
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引用次数: 0

摘要

基于线路后端 (BEOL) 晶体管的无电容 DRAM 架构具有低漏电、操作灵活和单片集成能力强等优点,有望成为长存储时间、高密度和低功耗的 3D DRAM 解决方案。与传统硅基器件不同,纳米级多栅极晶体管(如掺镓氮氧化物场效应晶体管)由于其复杂的多栅极原理、有限尺寸对传输的影响、变化源的增加和寄生效应的扩大等原因,目前还很少对其性能进行深入的物理描述研究。因此,我们制备了高性能多纳尺度(低至 50 纳米)双栅 a-IGZO 晶体管,并基于双栅耦合的表面势能和有限尺寸校正的无序传输建立了一个紧凑的物理模型。研究了短沟道对亚阈值摆动、迁移率和阈值电压的影响,并通过转移线法(TLM)验证了接触效应。关于双栅极对齐的具体挑战,可能的错位和寄生效应对多器件波动的影响是大规模电路设计的重要问题,并通过 TCAD 仿真进行了分析。此外,偏置温度不稳定性(BTI)也得到了全面研究。考虑到上述影响,该模型弥合了基于制造的材料特性和结构参数,有助于无电容多位存储器的抗阈值波动运行方案,在未来使用 BEOL 晶体管的单片集成电路设计中展现出巨大潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Physics-Based Compact Model of Independent Dual-Gate BEOL-Transistors for Reliable Capacitorless Memory
Capacitorless DRAM architectures based on Back-End-of-Line (BEOL)-transistors are promising for long-retention, high-density and low-power 3D DRAM solutions due to its low leakage, operational flexibility, and monolithic integration capability. Different from classical silicon-based devices, in-depth studies on the performances of nanoscale multi-gate transistors (e.g., a-InGaZnO-FET) are still barely conducted for physical description, due to the complicated multi-gating principle, finite-size effects on transport, increased variation sources and enlarged parasitic effect. Hence, high-performance multi-nanoscale (down to $\sim ~50$ nm) dual-gate a-IGZO transistors are fabricated, and a physical compact model is developed based on the surface potential for dual-gated coupling and the disordered transport with finite-size-correction. The short channel behaviors on sub-threshold swing, mobility and threshold voltage are investigated, and contact effects are validated by the transfer-line method (TLM). Regarding the specific challenge of dual-gate alignment, possible misalignment and parasitic effects on multi-device fluctuations are important of large-scale circuit design and analyzed by TCAD simulations. Besides, the bias-temperature instability (BTI) has been comprehensively investigated. In awareness of the above effects, this model bridges fabrication-based material properties and structural parameters, assisting in a threshold fluctuation-resistant operation scheme for capacitorless multi-bit memory, showing a great potential in future monolithic integration circuit design using BEOL-transistor.
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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