Su Jun, Li Xin, Xu Minxuan, Zhang Jian, Liu Xiaolian, Zheng Xin, Shi Yueqin, Zhang Qi
Center for Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University (HDU), Hangzhou 310018, China.
Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Hangzhou Dianzi University (HDU), Hangzhou 310018, P. R. China.
ACS Appl Mater Interfaces. 2023 Jan 18;15(2):3307-3316. doi: 10.1021/acsami.2c18537. Epub 2023 Jan 3.
Van der Waals semiconductors have been really confirmed in two-dimensional (2D) layered systems beyond the traditional limits of lattice-matching requirements. The extension of this concept to the 1D atomic level may generate intriguing physical functionalities due to its non-covalent bonding surface. However, whether the curvature of the lattice in such rolled-up structures affects their optoelectronic features or the performance of devices established on them remains an open question. Here, MoS-based nanoscrolls were obtained by virtue of an alkaline solution-assisted method and the 0D/1D (BaTiO/MoS) strategy to tune their optoelectronic properties and improve the light sensing performance was explored. The capillary force generated by a drop of NaHCO solution could drive the delamination of nanosheets from the underlying substrate and a spontaneous rolling-up process. The package of BaTiO particles in MoS nanoscrolls has been evident by TEM image, and the optical characterizations were mirrored via micro-Raman spectroscopy and photoluminescence. These bare MoS nanoscrolls reveal a reduced photoresponse compared to the plane structures due to the curvature of the lattice. However, such BaTiO/MoS nanoscrolls exhibit a significantly improved photodetection ( = 73.9 A/W vs = 1.1 A/W and = 1.5 A/W at 470 nm, 0.58 mW·cm), potentially due to the carrier extraction/injection occurring between BaTiO and MoS. This study thereby provides an insight into 1D van der Waals material community and demonstrates a general approach to fabricate high-performance 1D van der Waals optoelectronic devices.
范德华半导体已在二维（2D）层状体系中得到切实证实，突破了传统晶格匹配要求的限制。将这一概念扩展到一维原子层面，因其非共价键合表面可能会产生引人入胜的物理功能。然而，这种卷曲结构中晶格的曲率是否会影响其光电特性或基于它们构建的器件性能仍是一个悬而未决的问题。在此，通过碱性溶液辅助法制备了基于MoS的纳米卷轴，并探索了采用0D/1D（BaTiO/MoS）策略来调节其光电性能并提高光传感性能。一滴NaHCO溶液产生的毛细作用力可驱动纳米片从下层基底上分层并引发自发卷曲过程。通过透射电子显微镜图像可以明显看到BaTiO颗粒包裹在MoS纳米卷轴中，并且通过显微拉曼光谱和光致发光对光学特性进行了反映。与平面结构相比，这些裸露的MoS纳米卷轴由于晶格的曲率而显示出降低的光响应。然而，这种BaTiO/MoS纳米卷轴表现出显著改善的光电探测性能（在470 nm、0.58 mW·cm²时，响应度为73.9 A/W，而相比之下为1.1 A/W和1.5 A/W），这可能是由于在BaTiO和MoS之间发生了载流子提取/注入。本研究从而为一维范德华材料领域提供了深入见解，并展示了一种制造高性能一维范德华光电器件的通用方法。
