Zhang Yingyi, He Qinming, Yang Hui, Li Zhishen, Jiang He, Zhang Yi, Luo Xin, Zheng Yue
Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-sen University, Guangzhou 510275, China.
State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China.
Nano Lett. 2024 May 29;24(21):6247-6254. doi: 10.1021/acs.nanolett.4c00757. Epub 2024 May 6.
Two-dimensional (2D) semiconductors possess exceptional electronic, optical, and magnetic properties, making them highly desirable for widespread applications. However, conventional mechanical exfoliation and epitaxial growth methods are insufficient in meeting the demand for atomically thin films covering large areas while maintaining high quality. Herein, leveraging liquid metal oxidation reaction, we propose a motorized spin-coating exfoliation strategy to efficiently produce large-area 2D metal oxide (2DMO) semiconductors with high crystallinity, atomically thin thickness, and flat surfaces on diverse substrates. Moreover, we realized a 2D gallium oxide-based deep ultraviolet solar-blind photodetector featuring a metal-semiconductor-metal structure, showcasing high responsivity (8.24 A W) at 254 nm and excellent sensitivity (4.3 × 10 cm Hz W). This novel liquid-metal-based spin-coating exfoliation strategy offers great potential for synthesizing atomically thin 2D semiconductors, opening new avenues for future functional electronic and optical applications.
二维（2D）半导体具有卓越的电子、光学和磁学性能，使其在广泛应用中极具吸引力。然而，传统的机械剥离和外延生长方法不足以满足对大面积高质量原子级薄膜的需求。在此，利用液态金属氧化反应，我们提出了一种电动旋涂剥离策略，以在各种衬底上高效制备具有高结晶度、原子级薄厚度和平坦表面的大面积二维金属氧化物（2DMO）半导体。此外，我们实现了一种基于二维氧化镓的深紫外日盲光电探测器，其具有金属-半导体-金属结构，在254nm处展现出高响应度（8.24 A W）和优异的灵敏度（4.3×10 cm Hz W）。这种基于新型液态金属的旋涂剥离策略在合成原子级薄的二维半导体方面具有巨大潜力，为未来的功能电子和光学应用开辟了新途径。
