近日，南京理工大学的曾海波&张胜利及其研究团队取得一项新进展。经过不懈努力，他们通过高通量研究识别固有陡坡晶体管原子薄隔离带通道。相关研究成果已于2024年3月9日在国际知名学术期刊《科学通报》上发表。

该研究团队提出了一种利用具有隔离带特征的二维半导体作为通道，来实现MOS场效应管中的亚热离子亚阈值摆幅的策略。通过高通量计算，研究人员建立了一个结合原子结构和轨道相互作用，来确定其亚热电子输运势的指导原则。这指导研究人员从包含1608个系统的2D材料数据库中筛选192个候选材料。

此外，研究人员进一步揭示了亚热离子输运性能与电子结构之间的物理关系，这使他们能够预测15种具有低功率应用前景的器件性能，电源电压低于0.5 V。这项工作为基于二维材料的低功耗电子器件开辟了一条新途径，并将激发人们对固有陡坡MOS场效应管实验探索的广泛兴趣。

据悉，开发低功率场效应管对于推进逻辑电路具有重要意义，特别是当MOS场效应管的特征尺寸接近10纳米以下时。然而，这受到亚阈值摆幅（subthreshold swing, SS）的热离子限制，在室温下限制为每十年60 mV。

附：英文原文

Title: Identifying atomically thin isolated-band channels for intrinsic steep-slope transistors by high-throughput study

Author: Hengze Qu, Shengli Zhang, Jiang Cao, Zhenhua Wu, Yang Chai, Weisheng Li, Lain-Jong Li, Wencai Ren, Xinran Wang, Haibo Zeng

Issue&Volume: 2024/03/09

Abstract: Developing low-power FETs holds significant importance in advancing logic circuits, especially as the feature size of MOSFETs approaches sub-10 nanometers. However, this has been restricted by the thermionic limitation of SS, which is limited to 60 mV per decade at room temperature. Herein, we proposed a strategy that utilizes 2D semiconductors with an isolated-band feature as channels to realize sub-thermionic SS in MOSFETs. Through high-throughput calculations, we established a guiding principle that combines the atomic structure and orbital interaction to identify their sub-thermionic transport potential. This guides us to screen 192 candidates from the 2D material database comprising 1608 systems. Additionally, the physical relationship between the sub-thermionic transport performances and electronic structures is further revealed, which enables us to predict 15 systems with promising device performances for low-power applications with supply voltage below 0.5 V. This work opens a new way for the low-power electronics based on 2D materials and would inspire extensive interests in the experimental exploration of intrinsic steep-slope MOSFETs.

DOI: 10.1016/j.scib.2024.03.017

Source: https://www.sciencedirect.com/science/article/abs/pii/S2095927324001610