当前位置:首页>南京>苏州大学/南京大学王欣然教授 SCM:用于高可靠性低压二维铁电晶体管的原位氧化工艺

苏州大学/南京大学王欣然教授 SCM:用于高可靠性低压二维铁电晶体管的原位氧化工艺

  • 2026-05-08 19:42:30
苏州大学/南京大学王欣然教授 SCM:用于高可靠性低压二维铁电晶体管的原位氧化工艺
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苏州实验室/南京大学王欣然教授等人发表文章评述为An in-situ oxidation routine for reliable low-voltage 2D FeFETs”于 SCIENCE CHINA Materials

在人工智能与边缘计算快速普及的当下,传统冯・诺依曼架构中存储与计算单元分离带来的功耗与延迟问题日益突出,存算一体技术成为突破性能瓶颈的关键方向,铁电场效应晶体管(FeFET)凭借非易失性存储、低编程功耗、非破坏性读取与多值存储能力,成为存算一体芯片的核心器件。随着器件尺寸持续微缩,二维半导体凭借原子级厚度、无悬挂键表面与优异的静电调控能力,被视作后摩尔时代沟道材料的理想选择,将二维半导体与铁电材料结合构建的二维 FeFET,能够同时发挥铁电的非易失性与二维材料的短沟道抗性,在低功耗、高密度、可重构电路中具备广阔应用前景。但长期以来,二维 FeFET 的发展面临难以解决的瓶颈,二维材料无悬挂键的表面导致铁电层难以形核,无法生长均匀高质量的铁电薄膜,同时低压工作需求要求铁电层不断减薄,而传统氧化铪、铝钪氮等铁电材料在超薄化后会出现铁电性衰退、可靠性下降的问题,更为关键的是铁电层与二维沟道之间容易产生缺陷层、界面态与电荷注入,导致阈值漂移、存储器窗口减小、疲劳效应加剧,最终使得器件的 endurance 与保持性能无法满足实用化要求,如何实现超薄、均匀、高质量且与二维沟道形成原子级洁净界面的铁电层集成,成为推动二维 FeFET 走向实际应用的核心难题。本文针对这一关键问题,介绍了基于原位氧化构建本征铁电氧化物的创新路线,以二维 Bi₂O₂Se 为原料,通过低温精准氧化制备范德华铁电氧化物 α-Bi₂SeO₅,形成原子级共格的 Bi₂O₂Se/Bi₂SeO₅异质结,以此为核心结构实现晶圆级、低压、高可靠、超长寿命的二维 FeFET,为解决二维铁电器件界面与可靠性难题提供了全新方案。

图 1 展示了基于原位氧化制备的范德华铁电氧化物与二维 FeFET 的结构和关键性能,图 1a 呈现了通过低温原位氧化制备的晶圆级 α-Bi₂SeO₅铁电氧化物以及 Bi₂O₂Se/Bi₂SeO₅异质结的原子结构,该结构通过对二维 Bi₂O₂Se 半导体进行 400℃以下的精准氧化处理得到,氧化过程自限性强、厚度可控,所形成的铁电氧化物属于范德华层状结构,能够保持单原子层尺度的稳定铁电性,同时具备面内与面外极化翻转能力,相对介电常数接近 24,居里温度高达 880K,兼具高 κ 与高热稳定性的优势,更为重要的是原位氧化形成的异质结界面没有外来缺陷、无杂质层、无悬挂键,实现原子级平整且共格匹配,彻底解决了传统沉积法铁电层与二维材料界面质量差的问题,从根源上消除了界面态带来的器件漂移与疲劳问题。图 1b 为基于该异质结构建的二维 FeFET 的转移特性曲线与 endurance 性能测试结果,器件在 ±1V 的低压工作条件下,开关比超过 10⁶,存储窗口达到 0.9V,在 200 个器件阵列中的器件间差异性低于 5%,展现出优异的均一性,最为突出的是该器件在 0.8V 超低压、20ns 超快脉冲编程条件下,可实现超过 1.5×10¹² 次的循环擦写而不出现性能衰退,同时满足 10 年数据保持能力与 5 位多值存储能力,这一系列指标均为目前二维 FeFET 领域的最优水平,充分证明原位氧化本征铁电异质结策略在提升器件性能、降低工作电压、增强可靠性方面的革命性优势。

本研究提出的原位氧化方案,完全区别于传统将铁电层直接沉积在二维材料表面的思路,而是以二维半导体自身为前驱体,通过精准可控的低温氧化,在其表面原位转化生成铁电氧化物,这种方式从根本上避免了异质沉积带来的界面不匹配、形核困难、缺陷密集等问题,所制备的 α-Bi₂SeO₅是全新的范德华铁电氧化物,打破了传统铁电材料难以超薄化的限制,在单原子层厚度下仍保持稳定铁电性,同时兼具高介电常数与高温稳定性,能够完美适配二维器件的低压、低功耗需求,依托原子级洁净的共格界面,器件内部没有额外的电荷陷阱与寄生层,有效抑制了阈值电压漂移、疲劳效应与性能衰减,使得器件在超低工作电压下实现超快开关、超长循环寿命、长期数据保持与多电平存储,综合性能全面满足嵌入式存储与存算一体应用的要求。该路线还具备显著的规模化优势,能够实现晶圆级均匀制备,与单片三维集成的热预算要求兼容,简化了二维半导体与铁电氧化物的集成工艺,为三维逻辑 — 存储融合架构提供了可行的器件方案。从更广泛的视角来看,本原位氧化策略为功能氧化物与二维材料的集成提供了普适性思路,证明本征氧化工程能够有效解决界面兼容性难题,为开发更多类型的高性能、高可靠二维电子器件开辟了全新路径,推动二维 FeFET 从实验室研究走向实际芯片应用。

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  1. CONNECT:[ UseTime:0.000506s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000655s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000266s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000256s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000487s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000496s ]
  8. SELECT * FROM `article` WHERE `id` = 552685 LIMIT 1 [ RunTime:0.001380s ]
  9. UPDATE `article` SET `lasttime` = 1778274093 WHERE `id` = 552685 [ RunTime:0.004186s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000246s ]
  11. SELECT * FROM `article` WHERE `id` < 552685 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000524s ]
  12. SELECT * FROM `article` WHERE `id` > 552685 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000436s ]
  13. SELECT * FROM `article` WHERE `id` < 552685 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000775s ]
  14. SELECT * FROM `article` WHERE `id` < 552685 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000888s ]
  15. SELECT * FROM `article` WHERE `id` < 552685 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003058s ]
0.083140s