期刊
IEEE ELECTRON DEVICE LETTERS
卷 42, 期 1, 页码 66-69出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2020.3041657
关键词
2D group VA-VA monolayer; anisotropic electronic structure; transport property; first principles calculation
资金
- Training Program of the Major Research Plan of the National Natural Science Foundation of China [91964103]
- Natural Science Foundation of Jiangsu Province [BK20180071]
The study investigates the quantum transport properties of anisotropic 2D group VA-VA monolayers with puckered configuration in 5 nm FETs using density functional theory and nonequilibrium Green's function. The anisotropic electronic structures of these materials provide a physical mechanism for enhancing the performance of 2D ultra-short FETs, leading to high saturation current, steep sub-threshold swing, and high on-current. This suggests that strong anisotropic electronic structure can be a target feature for designing high performance 2D FETs, guiding the exploration of excellent 2D channels for ultra-scaled electronic devices.
Two-dimensional (2D) materials with anisotropic electronic structures possess promising prospect for ultra-scaled field effect transistors (FETs), such as black phosphorene. Here, the quantum transport properties of anisotropic 2D group VA-VA monolayers with puckered configuration are studied in 5 nm FETs using density functional theory and nonequilibrium Green's function. Through evaluating and comparing the transport effective mass (m(x)) and density of state (m(DOS)) of these 2D group VA-VA monolayers, we uncover the physical mechanism of the anisotropic electronic structures for the performances of 2D ultra-short FETs. These electronic structures can make the channel with a small m(x) hold a high mDOS, or the channel with heavy m(x) hold a small mDOS, which is beneficial to obtain high saturation current, steep sub-threshold swing, and thus a high on-current. Hence, the strong anisotropic electronic structure can be regarded as a target feature for designing high performance 2D FETs, which provides a guideline for exploring excellent 2D channels for ultra-scaled electronic devices.
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