物理学报2024，Vol.73Issue(1)：178-185,8.DOI:10.7498/aps.73.20231158
激光诱导放电等离子体极紫外辐射的模拟
Simulation of extreme ultraviolet radiation of laser induced discharge plasma
摘要
Abstract
Extreme ultraviolet(EUV)light source is an important part of EUV lithography system in semiconductor manufacturing.The EUV light source requires that the 4p64dn-4p54dn+1 + 4dn-14f transitions of Sn8+～13+ ions emit thousands of lines which form unresolved transition arrays near 13.5 nm.Laser-induced discharge plasma is one of the important technical means to excite target into an appropriate plasma condition.Laser-induced discharge plasma has a simple structure and a low cost.It also has important applications in mask inspection,microscopic imaging,and spectral metrology.In the design and production process,there are many factors that can influence the conversion efficiency,such as current,electrode shape,and laser power density.The simulation method is a convenient way to provide guidance for optimizing the parameters.In this paper,a completed radiation magneto-hydrodynamic model is used to explore the dynamic characteristics of laser-induced discharge plasma and its EUV radiation characteristics.To improve the accuracy,a more detailed global equation of state model,an atomic structure calculation model including relativistic effect and a collision radiation model are proposed simultaneously.The simulation reconstructs the discharge process effectively,which is divided into five stages in the first half cycle of current,including expansion of laser plasma,column formation of discharge plasma,diffusion of discharge plasma,contraction of discharge plasma,and re-diffusion of discharge plasma.It is revealed that the pinch effect during the current rising time exerts a significant influence on the generation of EUV radiation.The conversion efficiency of EUV radiation is still low under our existing conditions,and hopefully a higher rising rate of current can improve the conversion efficiency in the future work.关键词
辐射磁流体力学/激光诱导放电等离子体/碰撞辐射模型/极紫外光Key words
radiation magneto-hydrodynamic/laser induced discharge plasma/collisional-radiative model/extreme ultraviolet引用本文复制引用
王均武,玄洪文,俞航航,王新兵,Vassily S. Zakharov..激光诱导放电等离子体极紫外辐射的模拟[J].物理学报,2024,73(1):178-185,8.基金项目
广州市基础与应用基础研究专题(批准号:2023A04J0024)、中国科学院人才引进计划(批准号:E33310030D)和中国科学院空天信息创新研究院(批准号:E1Z1D101,E2Z2D101)资助的课题.Project supported by the Basic and Applied Basic Research Project of Guangzhou,China(Grant No.2023A04J0024),the Talent Introduction Program of Chinese Academy of Sciences,China(Grant No.E33310030D),and the Aerospace Information Innovation Research Institute,Chinese Academy of Sciences,China(Grant Nos.E1Z1D101,E2Z2D101). （批准号:2023A04J0024）
