Chen Ying
Hubei Engineering Technology Research Center of Energy Photoelectric Device and System, Hubei University of Technology, Wuhan 430068, China.
Hubei Collaborative Innovation Center for High-Efficient Utilization of Solar Energy, Wuhan 430068, China.
Micromachines (Basel). 2021 Jan 27;12(2):137. doi: 10.3390/mi12020137.
2D WS is a promising candidate for the next generation nanoelectronics, spintronics, valleytronics, and optoelectronics. However, the uncontrollably large-area growth of WS nanosheets and their unsatisfactory performance of the photodetectors based on WS hindered its applications. Here, we proposed a CVD method using tungstic acid as the precursors to grow WS flakes. After being characterized by AFM, Raman, PL, and TEM, we found the as-grown WS flakes were high-quality structures. Then the photodetectors based on the as-grown WS were fabricated, which exhibited high responsivity (7.3 A W), a fast response rate (a response time of 5 ms and a recovery time of 7 ms), prefect external quantum efficiency (EQE) (1814%), and remarkable detectivity () (3.4 × 10 Jones). Our works provided a new CVD method to grow some high-quality WS nanosheets.
二维WS是下一代纳米电子学、自旋电子学、谷电子学和光电子学的一个有前途的候选材料。然而，WS纳米片的大面积不可控生长以及基于WS的光电探测器的不理想性能阻碍了其应用。在此，我们提出了一种以钨酸为前驱体的化学气相沉积（CVD）方法来生长WS薄片。通过原子力显微镜（AFM）、拉曼光谱、光致发光（PL）和透射电子显微镜（TEM）表征后，我们发现生长出的WS薄片是高质量结构。然后制备了基于生长出的WS的光电探测器，其表现出高响应度（7.3 A/W）、快速响应速率（响应时间为5 ms，恢复时间为7 ms）、完美的外量子效率（EQE）（1814%）以及显著的探测率（3.4×10 Jones）。我们的工作提供了一种新的CVD方法来生长一些高质量的WS纳米片。
