稀土Er掺杂的MoSe2纳米线的制备及发光特性研究  

Preparation and luminescence properties of rare earth Er doped MoSe nanowires

作　　者：丁馨 徐铖 张强[1] 马锡英[1] DING Xin;XU Cheng;ZHANG Qiang;MA Xi-ying(School of Mathematics and Physics,Suzhou University of Science and Technology,Xuefu Road 99 in Gaoxin Section,Suzhou 215011 Jiangsu,China)

机构地区：[1]苏州科技大学数理学院,江苏省苏州215011

出　　处：《光电子．激光》2020年第6期595-599,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(31570515);江苏省十三五重点学科(20168765);苏州科技大学科研基金项目(XKZ201609);江苏省研究生科研创新计划项目(KYCX17_2061);江苏省研究生科研创新计划项目(KYCX18_2551)资助项目。

摘　　要：本文研究了稀土掺杂硒化钼(MoSe2)垂直纳米线的制备及光学特性。以分析纯硒化钼粉末为原料,采用热蒸发方法在Si衬底上沉积硒化钼垂直纳米线,并在其生长过程中利用硝酸鉺进行原位掺杂。利用原子力显微镜(AFM)、X射线衍射仪(XRD)、紫外-可见分光光度计和荧光光谱仪研究了掺杂硒化钼薄膜的表面形貌﹑晶体结构﹑光吸收和特性。发现掺杂后MoSe 2纳米线的结晶性更强,长度增加2倍以上。同时,掺杂后纳米线的可见光吸收和光致发光强度明显增强,760 nm处MoSe2纳米线的带间跃迁的本征发射增强4倍以上。另外,Er3+掺杂后,在590 nm和650 nm处增加了2个来自Er3+离子的发射,说明稀土掺杂后发光峰增加,使光谱谱线更加丰富。以上结果表明,稀土掺杂可显著增强硒化钼的结晶性、光吸收和发光效率,使其可用于制备超薄、高效率的太阳能电池、光探测器等光电子器件。In this paper,the preparation and optical properties of rare earth do ped molybdenum selenide(MoSe2)vertical nanowires are studied.Using analytica lly pure molybdenum selenide powder as raw material,molybdenum selenide vertical nanowires were deposited on Si substrate by thermal evaporation method,and in-situ doping was carried out by erbium nitrate during its growth process.Atomic force microscope(AFM),X-ray diffraction(XRD),ultraviolet-visible spectrophot ometer and fluorescence spectrometer were used to study the surface morphology,crystal structure and light absorption characteristics of doped molybdenum selen ide film.It is found that doped MoSe2nanowires have stronger crystallinity an d their length increases more than 2times.At the same time,the visible light absorption and photoluminescence intensity of doped nanowires are obviously enha nced,and the intrinsic emission of band-to-band transition of MoSe2nanowire s at 760nm is enhanced by more than 4times.In addition,the emission from Er3+ions increases at 590nm and 650nm after Er3+doping,which indicates that the e mission peak increases after rare earth doping,making the spectral lines more a bundant.The above results show that rare earth doping can significantly enhance the crystallinity,light absorption and luminous efficiency of molybdenum selen ide,which can be used to prepare ultra-thin and high-efficiency optoelectronic devices such as solar cells and photodetectors.

关 键 词：MoSe2纳米线 稀土Er掺杂 热蒸发 光吸收 光致发光 

分 类 号：TB383[一般工业技术—材料科学与工程]