<br>通过超低气体流量控制的动态传输对大面积三角 2D Cr2S3 薄膜进行相控合成,Advanced Functional Materials

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通过超低气体流量控制的动态传输对大面积三角 2D Cr2S3 薄膜进行相控合成
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-05-14 , DOI: 10.1002/adfm.202404750
Xiulian Fan ₁ , Zhihui Chen ₁ , Defeng Xu ₁ , Luwei Zou ₁ , Fangping Ouyang _{1,

2,

3} , Shibin Deng _{4,

5} , Xiao Wang ₆ , Jiong Zhao ₇ , Yu Zhou _{1,

2}

Affiliation

对于非层状 2D 多晶型材料，尤其是 Cr 基硫化物，具有相位控制的大面积薄膜生长被认为是磁性、电子和光电器件最重要的合成挑战。然而，用于非层状 2D 材料的大型连续薄膜的合成方法仍然有限且很少报道，对于相控制生长也是如此，它受到各向同性 3D 生长和不同相的类似吉布斯自由能的抑制。在此，建立了增强质量传递化学气相沉积以实现三角 Cr₂S₃ 薄膜的控制合成，其中稳定的边界层提供连续的反应组分并调节反应动力学。通过原子结构表征、光吸收和压电测量证实了三角相的形成，展示了不同于菱面体相的独特物理性质。三角 Cr₂S₃ 薄膜显示出明显的层独立和不同的角分辨谐波产生，表明表面断裂对称性，可以通过对本体的压电响应的组合来理解。该工作提出了通过修改质量传输对具有新相形成的非层状二维材料进行大面积合成的策略，并为未来的非线性光学材料建立了表面对称性打破主导的 SHG 机制。

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Phase-Controlled Synthesis of Large-Area Trigonal 2D Cr2S3 Thin Films via Ultralow Gas-Flow Governed Dynamic Transport

As for nonlayered 2D polymorphic materials, especially for Cr-based chalcogenides, large-area thin film growth with phase control is considered the most important synthesis challenge for magnetic, electronic, and optoelectronic devices. However, the synthesis methods of large continuous thin films for nonlayered 2D materials are still limited and rarely reported, also for the phase control growth, which is inhibited by isotropic 3D growth and similar Gibbs free energy for different phases. Herein, enhanced mass transport chemical vapor deposition is established to achieve the control synthesis of trigonal Cr₂S₃ thin films, in which the stable boundary layer supplies the continuous reaction species and tunes the reaction kinetics. The trigonal phase formation is confirmed by atomic structure characterization, optical absorption and piezoelectric measurements, demonstrating unique physical properties different from rhombohedral phase. The trigonal Cr₂S₃ thin films show obvious layer independent and dissimilar angle-resolved harmonic generation, indicating the surface broken symmetry that can be understood by the combination of negligible piezoelectric response for bulk. The work presents the large-area synthesized strategy by the modification of mass transport for nonlayered 2D materials with new phase formation and establishes the surface symmetry breaking dominated SHG mechanism for future nonlinear optical materials.

更新日期：2024-05-14

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