P-Type Vertical FETs Realized by Using Fermi-Level Pinning-Free 2D Metallic Electrodes

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-12-23 DOI:10.1021/acs.nanolett.4c05136

Hyokwang Park, Hoseong Shin, Nasir Ali, Hyungyu Choi, Brian S. Y. Kim, Boseok Kang, Min Sup Choi, Won Jong Yoo

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Abstract

In two-dimensional (2D) nanomaterial electronics, vertical field-effect transistors (VFETs), where charges flow perpendicular to the channel materials, hold promise due to the ease of forming ultrashort channel lengths by utilizing the thinness of 2D materials. However, the poor performance of p-type VFET arises from the lack of a gate-field-penetrating electrode with suitable work functions, which is essential for VFET operation. This motivated us to replace graphene (work function of ∼4.5 eV) with a high-work-function electrode to achieve the desired VFET characteristics. In this study, we demonstrate that WSe₂-based p-type VFETs with a high on/off ratio of ∼10⁵ can be realized using van-der-Waals contacts formed with high-work-function 2D metals (i.e., 2H-TaS₂, NbSe₂, and NbS₂), which form a p-type ohmic contact to the WSe₂ channel by suppressing Fermi-level pinning. Furthermore, we successfully fabricate a 2D metal-incorporating pseudocomplementary FET structure, demonstrating a great potential to significantly reduce the scaling factor by dense structure and vertical operation.

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.