Key Takeaways & Executive Findings
- •• • Growth rate of 75 μm/s for single-crystal MoS2 exceeds conventional CVD by orders of magnitude, directly reducing fabrication cycle time and enabling economically viable scale-up for industrial IC production. • • On-state current of 443.8 μA/μm and mobility of 105.4 cm2/(V s) in MoS2 transistor arrays demonstrate device-grade electronic quality, meeting performance metrics required for sub-1 nm channel nodes. • • Centimeter-scale single-crystal domains achieved via single-nucleus growth on a 2D liquid-liquid interface eliminate translational grain boundaries that plague stitched CVD films, reducing defect density and improving yield. • • O2 etching converts polycrystalline MoS2 into a liquid precursor, while molten glass facilitates a 2D liquid film; sulfur vapor triggers in-plane crystallization, enabling precise control over nucleation density and domain competition.
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Abstract
The commentary by Yi Xie evaluates the Zhang Growth Method, a two-dimensional liquid-liquid interface crystallization technique developed by Professor Yue Zhang's team at the University of Science and Technology Beijing, which enables the synthesis of centimeter-scale single-crystal monolayer MoS2 for integrated circuit (IC) fabrication. Conventional chemical vapor deposition (CVD) of transition metal dichalcogenides (TMDCs) suffers from uncontrolled nucleation and coalescence, producing high-density translational grain boundaries that degrade electrical performance. The Zhang Growth Method circumvents these limitations by first depositing polycrystalline MoS2 in a sulfur-rich ambient, then applying an O2 etch to generate a liquid precursor. On a molten glass substrate, this precursor forms a two-dimensional liquid film that serves as a crystallization template. Sulfur vapor injection triggers rapid in-plane crystallization, yielding single-nucleus growth of MoS2 domains at a rate of 75 μm/s, substantially exceeding typical CVD growth rates. In-situ Langmuir-Blodgett imaging confirms the formation of atomically thin liquid precursors and reveals a growth mechanism governed by precursor diffusion and aggregation. The resulting high-quality crystals enable MoS2-based transistor arrays with an on-state current of 443.8 μA/μm and a field-effect mobility of 105.4 cm2/(V s). This method addresses the critical bottleneck of large-scale, single-crystal 2D semiconductor production, offering a viable pathway for next-generation ICs at the atomic level.
1. Introduction
Semiconductor miniaturization is approaching fundamental physical limits, necessitating new channel materials for next-generation integrated circuits. Atomically thin two-dimensional transition metal dichalcogenides (TMDCs) offer stable electrical properties below 1 nm thickness, positioning them as leading candidates. However, chemical vapor deposition (CVD), the predominant growth method, fails to suppress interactions between adjacent crystal domains, resulting in high-density grain boundaries that degrade material quality. Attempts to stitch micron-sized domains into single-crystal wafers introduce translational grain boundaries from imperfect splicing, preventing true single-crystal formation.
The Zhang Growth Method, pioneered by Professor Yue Zhang's team, overcomes these limitations by crystallizing on a two-dimensional liquid-liquid interface. This approach employs superwetting surfaces to facilitate 2D crystallization, achieving single-nucleus growth of centimeter-scale single-crystal MoS2. The process begins with polycrystalline MoS2 deposition in a sulfur-rich environment, followed by O2 etching to form a liquid precursor. On a molten glass substrate, a 2D liquid film forms as the crystallization precursor. Sulfur vapor injection then triggers rapid in-plane crystallization, yielding large-area MoS2 domains at a growth rate of 75 μm/s. This method reduces nucleation density, enhances growth rate, and minimizes domain competition, enabling MoS2-based transistor arrays with an on-state current of 443.8 μA/μm and mobility of 105.4 cm2/(V s).
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Yi Xie (2025). A Big Step Towards Integrated Circuit Manufacturing from Two-Dimensional Semiconductors. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3288-6
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Frequently Asked Questions
What is the primary failure mechanism of conventionally grown 2D TMDCs that limits their use in integrated circuits?
Conventional CVD growth cannot suppress interactions between adjacent crystal domains, leading to high-density grain boundaries. These translational grain boundaries act as scattering centers and leakage paths, degrading carrier mobility and on-state current. For instance, polycrystalline MoS2 films typically exhibit mobility values below 10 cm2/(V s), whereas the Zhang Growth Method achieves 105.4 cm2/(V s) by eliminating such boundaries.
How does the Zhang Growth Method achieve a growth rate of 75 μm/s, and what are the industrial implications?
The method employs a 2D liquid precursor film on molten glass, which facilitates rapid in-plane crystallization upon sulfur vapor injection. This liquid-solid reaction reduces nucleation density and diffusion barriers, enabling a growth rate of 75 μm/s—orders of magnitude faster than typical CVD (often <1 μm/s). Industrially, this rate reduces fabrication time and cost, making large-scale production of single-crystal MoS2 wafers feasible for IC manufacturing.
What are the scalability bottlenecks for the Zhang Growth Method when transitioning from laboratory to high-volume manufacturing?
The method requires precise control of the molten glass substrate temperature and sulfur vapor delivery to maintain a stable 2D liquid film. Uniformity over large areas (e.g., 300 mm wafers) depends on consistent superwetting surface properties and O2 etching uniformity. Additionally, the O2 etching step must be optimized to avoid introducing defects. Current demonstrations are at centimeter scale; scaling to full wafers will require engineering solutions for thermal management and precursor distribution.
How does the electrical performance of MoS2 transistors fabricated via the Zhang Growth Method compare to state-of-the-art silicon devices?
The reported on-state current of 443.8 μA/μm and mobility of 105.4 cm2/(V s) are competitive with advanced silicon FinFETs at comparable dimensions, though silicon still leads in maturity and uniformity. For sub-1 nm channel nodes, MoS2 offers superior electrostatic control and low leakage. The Zhang Growth Method's single-crystal quality reduces variability, a critical factor for IC yield, but further optimization is needed to match silicon's reliability metrics.
What is the role of O2 etching in the Zhang Growth Method, and how does it affect crystal quality?
O2 etching converts polycrystalline MoS2 into a liquid precursor by breaking down grain boundaries and forming a homogeneous melt. This step is crucial for eliminating pre-existing defects and enabling single-nucleus crystallization. In-situ imaging confirms that the resulting 2D liquid film is atomically thin and free of translational boundaries. The etching parameters (e.g., O2 partial pressure, temperature) must be tightly controlled to prevent over-etching or incomplete conversion, which would compromise crystal quality.
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