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Chemical Vapor Deposition of Er-Doped WS2 Flakes with Near-Infrared Emission and Enhanced Near-Infrared Photoresponse
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2023-06-22 , DOI: 10.1021/acs.jpcc.3c00135
Lei Wang 1, 2 , Shuai Zhang 1, 2 , Long Yan 1, 2 , Xiaohong Ji 1 , Qinyuan Zhang 1, 2, 3
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2023-06-22 , DOI: 10.1021/acs.jpcc.3c00135
Lei Wang 1, 2 , Shuai Zhang 1, 2 , Long Yan 1, 2 , Xiaohong Ji 1 , Qinyuan Zhang 1, 2, 3
Affiliation
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The electronic and optical properties of two-dimensional transition metal dichalcogenides can be tuned by a doping strategy. Herein, spiral and monolayer Er-doped WS2 (WE) flakes have been synthesized by chemical vapor deposition using ErCl3, WO3, and S as precursors. The growth and properties of WE flakes have been systematically studied based on experimental and theoretical analysis. The morphology, size, and thickness of WE flakes can be regulated by adjusting the molar ratio of ErCl3/WO3 and the growth time. It has been found that the ErCl3 precursor not only acts as the promoter of the WE flakes during the growth but also drives the formation of screw dislocations owing to the internal strain in the lattice induced by Er3+ doping. The WE flakes exhibit near-infrared (NIR) emission at ∼1530 nm under 980 nm excitation, which corresponds to the energy transition from 4I13/2 to 4I15/2 of the Er3+ dopants. In addition, the WE-based device exhibits improved NIR photoresponse with a 16.9-fold enhancement in photocurrent compared with that of the WS2-based device. Our work provides a simple method for the preparation of highly crystalline WE flakes with NIR emission and enhanced NIR photoresponse.
中文翻译：
具有近红外发射和增强近红外光响应的掺铒 WS2 薄片的化学气相沉积
二维过渡金属二硫属化物的电子和光学性质可以通过掺杂策略来调节。在此，使用ErCl 3、WO 3和S作为前体，通过化学气相沉积合成了螺旋形和单层Er掺杂的WS 2 (WE)薄片。基于实验和理论分析，对 WE 薄片的生长和性能进行了系统研究。WE薄片的形貌、尺寸和厚度可以通过调节ErCl 3 /WO 3的摩尔比和生长时间来调节。研究发现，ErCl 3前驱体不仅在生长过程中充当WE薄片的促进剂，而且由于Er 3+ 掺杂引起的晶格内应变而驱动螺旋位错的形成。WE 薄片在 980 nm 激发下在~1530 nm 处表现出近红外 (NIR) 发射，这对应于Er 3+掺杂剂从4 I 13/2到4 I 15/2的能量跃迁。此外，与基于 WS 2的器件相比，基于 WE 的器件表现出改进的近红外光响应，光电流增强了 16.9 倍。我们的工作提供了一种简单的方法来制备具有近红外发射和增强的近红外光响应的高度结晶的 WE 薄片。
更新日期：2023-06-22
中文翻译：
具有近红外发射和增强近红外光响应的掺铒 WS2 薄片的化学气相沉积
二维过渡金属二硫属化物的电子和光学性质可以通过掺杂策略来调节。在此，使用ErCl 3、WO 3和S作为前体，通过化学气相沉积合成了螺旋形和单层Er掺杂的WS 2 (WE)薄片。基于实验和理论分析，对 WE 薄片的生长和性能进行了系统研究。WE薄片的形貌、尺寸和厚度可以通过调节ErCl 3 /WO 3的摩尔比和生长时间来调节。研究发现，ErCl 3前驱体不仅在生长过程中充当WE薄片的促进剂，而且由于Er 3+ 掺杂引起的晶格内应变而驱动螺旋位错的形成。WE 薄片在 980 nm 激发下在~1530 nm 处表现出近红外 (NIR) 发射，这对应于Er 3+掺杂剂从4 I 13/2到4 I 15/2的能量跃迁。此外，与基于 WS 2的器件相比，基于 WE 的器件表现出改进的近红外光响应，光电流增强了 16.9 倍。我们的工作提供了一种简单的方法来制备具有近红外发射和增强的近红外光响应的高度结晶的 WE 薄片。
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