Substantially Enhanced Properties of 2D WS_(2) by High Concentration of Erbium Doping against Tungsten Vacancy Formation
作者机构：Chongqing Institute of Green and Inteligent TechnologyChinese Academy of SciencesChina University of Chinese Academy of SciencesBejing 100064China Chongqing University of Posts and TelecommunicationsChongqing 400065China
出 版 物：《Research》 (研究（英文）)
年 卷 期：2022年第2022卷第4期
页 面：333-345页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
基 金：This work was supported in part by the National Nature Science Foundation of China through Grant Nos.61775214 the Natural Science Foundation of Chongqing,China,under grant Nos.cstc2019jcyj-zdxmX0003 and cstc2019jcyj-msxmX0387 the Project of Chongqing Talents under the grant number of CQYC202002064 the Youth Innovation Promotion Association CAS.The numerical calculations in this paper have been done on Heifei Computing Center.
主 题：excitation vacancy rare
摘 要：Doping in 2D materials is an important method for tuning of band structures.For this purpose,it is important to develop controllable doping techniques.Here,we demonstrate a substitutional doping strategy by erbium(Er)ions in the synthesis of monolayer WS2 by chemical vapor deposition.Substantial enhancements in photoluminescent and photoresponsive properties are achieved,which indicate a tungsten vacancy suppression mechanism by Er filling.Er ion doping in the monolayer WS2 is proved by X-ray diffraction(XRD)and X-ray photoelectron spectra(XPS),fluorescence,absorption,excitation,and Raman spectra.11.5 at%of the maximum Er concentration is examined by energy dispersive X-ray spectroscopy(EDX).Over 6 times enhancement of intensities with 7.9 nm redshift in peaks are observed from the fluorescent spectra of Er-doped WS2 monolayers compared with their counterparts of the pristine WS2 monolayers,which agrees well with the density functional theory calculations.In addition,over 11 times of dark current,469 times of photocurrents,photoresponsivity,and external quantum efficiency,and two orders of photoresponse speed are demonstrated from the Er-doped WS2 photodetector compared with those of the pristine WS2 device.Our findings prove rare-earth doping in 2D materials,the exciting and ideal technique for substantially enhanced photoluminescent and photoresponsive properties.
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