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\textbf{²ã¼äñîºÏ}£ºÈÈÁ¿ÔÚ40²ãMo/SiĤÖÐ×ÝÏò´«µ¼£¬ÊܽçÃæÈÈ×èÓ°Ï죬ζȷֲ¼²»¾ùÔÈ£» \item \textbf{Ó¦Á¦ÀÛ»ý}£º¸÷²ãÈÈÓ¦Á¦Í¨¹ý²ã¼äñîºÏϵÊýÖð²ã´«µÝ£¬×îÖÕ±íÏÖÎªÃæÐαäÐΣ» \item \textbf{¶¯Ì¬ÏìÓ¦}£ºÂö³å·øÕÕµ¼ÖÂ˲̬Èȳå»÷£¬Ê±¼ä³ß¶ÈÓëÆØ¹â½ÚÅÄñîºÏ¡£ \end{itemize} ±¾ÎÄÔÚ×÷ÕßǰÆÚÌá³öµÄ40²ãMo/SiĤӦÁ¦µÝ¹é·½³Ì\cite{recursive}»ù´¡ÉÏ£¬½¨Á¢ÈÈ-Ó¦Á¦ñîºÏµÄµÝ¹é½âÎöÄ£ÐÍ¡£Í¨¹ý½âÎö±í´ïʽÃèÊöÄÜÁ¿³Á»ý¡¢ÈÈ´«µ¼¡¢ÈÈÓ¦Á¦¼°²¨Ç°»û±ä£¬ËùÓвÎÊý¾ùͨ¹ý¹«¿ªÎÄÏױ궨£¬Ö¼ÔÚΪHigh NA EUV¹â¿Ì»úµÄÈȹÜÀíÌṩÀíÂÛ¹¤¾ß¡£ \section{Ä£Ðͽ¨Á¢} \subsection{ÈÈÔ´Ï»ùÓÚ´«µÝ¾ØÕóµÄÄÜÁ¿³Á»ý} EUV¹âÔÚ¶à²ãĤÖеÄÎüÊÕÓɹâµç³¡·Ö²¼¾ö¶¨¡£ÉèÈëÉä¹âÇ¿·Ö²¼Îª¸ß˹ÐÍ£¨ÖÐÐÄÇ¿¡¢±ßÔµÈõ£©£º \begin{equation} I_0(r) = I_{\text{peak}} \exp\left(-\frac{r^2}{2\sigma_I^2}\right) \end{equation} ÆäÖÐ$r$ΪÀë¾µÃæÖÐÐĵľ¶Ïò¾àÀ룬$\sigma_I$Ϊ¹âÇ¿·Ö²¼¿í¶È¡£ µÚ$k$²ãÎüÊÕµÄÈÈÁ÷ÃܶÈÓÉ´«µÝ¾ØÕ󷨸ø³ö£º \begin{equation} q_k(r) = I_0(r) \cdot A_k \end{equation} ÆäÖÐ$A_k$ΪµÚ$k$²ãµÄÎüÊÕÂÊ£º \begin{equation} A_k = \frac{4\pi n_k \kappa_k}{\lambda} \int_{z_k}^{z_{k+1}} |E(z)|^2 dz \end{equation} $n_k + i\kappa_k$ΪµÚ$k$²ã²ÄÁϵĸ´ÕÛÉäÂÊ£¬$E(z)$Ϊ¹âµç³¡·Ö²¼£¬Óɶà²ãĤµÄ¹âѧ³£ÊýºÍ²ãºñ¾ö¶¨¡£ \textbf{£¨ºËÐļ¼Êõ·¢Ã÷£º»ùÓÚ´«µÝ¾ØÕóµÄ¶à²ãĤÄÜÁ¿³Á»ýÏÔʽ±í´ïʽ£¬Îª²ã¼äÈÈÔ´·ÖÅäÌṩ½âÎö»ù´¡£©} \subsection{ÈÈ´«µ¼·½³Ì£¨º¬½çÃæÈÈ×裩} ˲̬ÈÈ´«µ¼·½³ÌΪ£º \begin{equation} \rho_k c_{p,k} \frac{\partial T_k}{\partial t} = \nabla \cdot (k_k \nabla T_k) + q_k(r,t) \end{equation} ÆäÖÐ$\rho_k$ΪÃܶȣ¬$c_{p,k}$Ϊ±ÈÈÈÈÝ£¬$k_k$ΪÈȵ¼ÂÊ¡£ ½çÃæ´¦±ß½çÌõ¼þ£¨¿¼ÂÇMo/Si½çÃæÈÈ×è$R_{k,k+1}$£©£º \begin{equation} -k_k \frac{\partial T_k}{\partial z}\bigg|_{z=z_{k+1}} = \frac{T_k(z_{k+1}) - T_{k+1}(z_{k+1})}{R_{k,k+1}} = -k_{k+1} \frac{\partial T_{k+1}}{\partial z}\bigg|_{z=z_{k+1}} \end{equation} ¸ù¾Ý2025Äê·¢±íµÄ·Ö×Ó¶¯Á¦Ñ§Ñо¿£¬Mo/Si½çÃæÈÈ×èÔÚ200-900K·¶Î§ÄÚ½üËÆÎª³£Êý£º \begin{equation} R_{\text{Mo/Si}} \approx 1.5 \times 10^{-8} \, \text{m}^2\text{K/W} \end{equation} µ±Si²ãºñ¶ÈСÓÚ4.2 nmʱ£¬ÈÈ×èËæºñ¶ÈÔö¼Ó¶øÏ½µ£¨×¼µ¯µÀÊäÔË£©£»´óÓÚ4.2 nmʱ£¬ÈÈ×è»ØÉý£¨Éù×ÓÉ¢ÉäÔöÇ¿£©¡£´æÔÚ×îÓźñ¶ÈÇø¼ä4.0¨C4.5 nm£¨È¡¾öÓÚ½çÃæ´Ö²Ú¶È¼°¹¤ÒÕÌõ¼þ£©£¬Ê¹×ÝÏòÈÈ´«µ¼Ð§ÂÊ×î¸ß¡£ \textbf{£¨ºËÐļ¼Êõ·¢Ã÷£º½çÃæÈÈ×èÃô¸ÐµÄ²ã¼äÈÈ´«µ¼±ß½çÌõ¼þ£¬½ÒʾÁËSi²ãºñ¶ÈÓëÈÈ×èµÄ·Çµ¥µ÷¹ØÏµ£©} \subsection{ÈÈÓ¦Á¦·½³Ì} µÚ$k$²ãµÄÈÈÓ¦Á¦ÓÉζȷֲ¼¾ö¶¨£¨ºöÂÔ˲̬ÂÊÏ½ö¿¼ÂÇζȱ仯Á¿£©£º \begin{equation} \sigma_k^{\text{thermal}}(r,t) = \frac{E_k \alpha_k}{1-\nu_k} \left[ T_k(r,t) - T_0 \right] \end{equation} ÆäÖÐ$E_k$ΪÑîÊÏÄ£Á¿£¬$\alpha_k$ΪÈÈÅòÕÍϵÊý£¬$\nu_k$Ϊ²´Ëɱȣ¬$T_0$Ϊ²Î¿¼Î¶ȡ£ \subsection{À©Õ¹µÄÓ¦Á¦µÝ¹é·½³Ì} ×÷ÕßǰÆÚ¹¤×÷¸ø³öÁËMo/SiĤµÄÓ¦Á¦µÝ¹é¹ØÏµ£º \begin{equation} \sigma_k^{\text{intrinsic}} = \sigma_0 r^k + \sum_{j<k} \gamma_{kj} \sigma_j,\quad \gamma_{kj} = \gamma_0 r^{|k-j|} \end{equation} ÆäÖÐ$r=0.618$Ϊ˥¼õÒò×Ó£¬$\gamma_0=0.12$Ϊ»ù´¡ñîºÏϵÊý¡£ ½«ÈÈÓ¦Á¦Ïî¼ÓÈëµÝ¹é¿ò¼Ü£º \begin{equation} \sigma_k^{\text{total}}(r,t) = \sigma_0 r^k + \sum_{j<k} \gamma_{kj} \sigma_j^{\text{total}}(r,t) + \sigma_k^{\text{thermal}}(r,t) \label{eq:stress_full} \end{equation} \textbf{£¨ºËÐļ¼Êõ·¢Ã÷£º½«ÈÈÓ¦Á¦ÏîǶÈë40²ãµÝ¹é¿ò¼Ü£¬Ê×´ÎʵÏÖ²ã¼äÈÈÓ¦Á¦´«µÝÓëÀÛ»ýµÄ½âÎöÃèÊö£©} \subsection{ÃæÐαäÐΣº»ùÓÚ°å¿ÇÀíÂ۵ĸ߽×Ïñ²î¼ÆËã} ÓÉÓÚEUV¹âԴΪ¸ß˹·Ö²¼$I_0(r)$£¬ÈÈÔ´·Ç¾ùÔȵ¼ÖÂÓ¦Á¦$\sigma_k(r)$Ëæ°ë¾¶¾çÁұ仯£¬¾µÃæ²úÉú°üº¬¸ß½×Ïñ²î£¨Çò²î¡¢åç²î£©µÄ¸´ÔÓÐα䡣¾µäStoney¹«Ê½½öÊÊÓÃÓÚ¾ùÔÈÓ¦Á¦³¡£¬ÎÞ·¨ÃèÊö´ËÀà·Ç¾ùÔȱäÐΡ£Òò´Ë£¬±ØÐë²ÉÓÃ\textbf{±¡°å/¿ÇÀíÂÛ}¡£ Éè¾µÃæÎªÖá¶Ô³Æ±¡°å£¬¿¹Íä¸Õ¶ÈΪ$D = \frac{E_s t_s^3}{12(1-\nu_s^2)}$¡£ÓÉÓÚMoºÍSiµÄÑîÊÏÄ£Á¿²îÒìÏÔÖø£¨$E_{\text{Mo}}\approx 320$ GPa£¬$E_{\text{Si}}\approx 130$ GPa£©£¬ÖÐÐÔÃæÎ»ÖÃ$z_0$Ðè°´¸Õ¶È¼ÓȨ¼ÆË㣺 \begin{equation} z_0 = \frac{\sum_{k=1}^{40} E_k \int_{z_{k-1}}^{z_k} z \, dz}{\sum_{k=1}^{40} E_k (z_k - z_{k-1})} \end{equation} Í侨·Ö²¼Óɸ÷²ãÓ¦Á¦¹±Ï×£º \begin{equation} M(r,t) = \sum_{k=1}^{40} \int_{z_{k-1}}^{z_k} \sigma_k^{\text{total}}(r,t) (z - z_0) dz \end{equation} ÆäÖÐ$M(r,t)$ΪµÈЧÈÈÍ侨 (Equivalent Thermal Moment)£¬ÆäÌݶȵÄÉ¢¶È$-\nabla^2 M$ÔÚÎïÀíÉϵÈЧÓÚ×÷ÓÃÔÚ°åÃæÉϵĺáÏò·Ö²¼ÔغÉ$q_{\text{eff}}(r,t)$¡£ÃæÐαäÐÎ$w(r,t)$Âú×ãË«µ÷ºÍ·½³Ì£º \begin{equation} D \nabla^4 w(r,t) = -\nabla^2 M(r,t) \end{equation} ¶ÔÓÚÖá¶Ô³ÆÇé¿ö£¬$\nabla^4 = \frac{1}{r}\frac{d}{dr}\left(r\frac{d}{dr}\left(\frac{1}{r}\frac{d}{dr}\left(r\frac{d}{dr}\right)\right)\right)$¡£¶Ô·½³Ì½øÐÐÁã½×ºº¿Ë¶û±ä»»£¬×¢Òâµ½Ëã×Ó¶ÔÓ¦¹ØÏµ$\nabla^2 \xrightarrow{\mathcal{H}} -k^2$£¬$\nabla^4 \xrightarrow{\mathcal{H}} k^4$£¬Òò´Ë·½³ÌÓÒ²à±ä»»Îª$-(-k^2)\tilde{M}(k,t) = k^2 \tilde{M}(k,t)$£¬×ó²àΪ$D k^4 \tilde{w}(k,t)$£¬ÕûÀíµÃ£º \begin{equation} \tilde{w}(k,t) = \frac{\tilde{M}(k,t)}{D k^2} \end{equation} ÆäÖÐ$\tilde{w}(k,t)$ºÍ$\tilde{M}(k,t)$·Ö±ðΪ$w(r,t)$ºÍ$M(r,t)$µÄºº¿Ë¶û±ä»»¡£×îÖÕÃæÐÎÓÉÄæ±ä»»µÃµ½£º \begin{equation} w(r,t) = \int_0^\infty \tilde{M}(k,t) J_0(kr) \frac{k}{D k^2} dk \end{equation} ¸Ã·½·¨ÍêÕû±£ÁôÁ˸߽×Ïñ²îÐÅÏ¢£¨Èç$Z_4$Àë½¹¡¢$Z_{5,6}$ÏñÉ¢¡¢$Z_{7,8}$åç²îµÈ£©£¬ÎªºóÐø±äÐξµÐ£ÕýÌṩ׼ȷÊäÈë¡£ \textbf{£¨ºËÐļ¼Êõ·¢Ã÷£º½«°å¿ÇÀíÂÛÒýÈë¶à²ãĤÈȱäÐμÆË㣬Ê×´ÎʵÏַǾùÔÈÈÈÓ¦Á¦Ï¸߽×Ïñ²îµÄ½âÎöÔ¤²â£©} \subsection{Ö÷¶¯²¹³¥²ßÂÔ£º»ùÓڵݹéÄ£Ð͵ÄÄ£ÐÍÔ¤²âǰÀ¡¿ØÖÆ} 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$\sigma_k^{\text{thermal}}$ & µÚ$k$²ãÈÈÓ¦Á¦£¨GPa£© \\ $\sigma_k^{\text{total}}$ & µÚ$k$²ã×ÜÓ¦Á¦£¨º¬±¾Õ÷¡¢ñîºÏ¡¢ÈÈÓ¦Á¦£©£¨GPa£© \\ $z_0$ & ÖÐÐÔÃæÎ»Öã¨m£© \\ $M(r,t)$ & µÈЧÈÈÍ侨£¨N£© \\ $w(r,t)$ & ¾µÃæÈȱäÐΣ¨m£© \\ $\tilde{w}(k,t)$ & ÃæÐεĺº¿Ë¶û±ä»» \\ $\mathbf{H}$ & ±äÐξµÓ°Ï캯Êý¾ØÕó \\ $\mathbf{V}$ & ´Ù¶¯Æ÷µçѹÏòÁ¿ \\ \bottomrule \end{longtable} \begin{thebibliography}{99} \bibitem{spiller2005} Spiller E. Soft X-ray Optics. SPIE Press, 2005. \bibitem{windt1997} Windt D L, et al. Mo/Si multilayer coatings for EUV lithography. Applied Optics, 1997, 36(19): 4461-4467. \bibitem{zeiss2012} Carl Zeiss SMT GmbH, US Patent Application 2012/0044473 A1, 2012. \bibitem{recursive} ×÷ÕßǰÆÚ¹¤×÷. ¼«×ÏÍâ¶à²ãĤ·´Éä¾µ¹¤ÒÕ¿ØÖÆÓëÓÅ»¯ÀíÂÛ£º»ùÓÚÓ¦Á¦µÝ¹éÄ£ÐÍµÄÆ«²î¿ØÖÆ·½·¨. ¼¼Êõ±¨¸æ, 2026. \bibitem{thermal_review} Cao D, et al. Thermal Control Systems in Projection Lithography Tools: A Comprehensive Review. Micromachines, 2025, 16(8): 880. \bibitem{wavefront} ¼«×ÏÍâ¹â¿ÌÎï¾µÈÈÖ²¨Ç°»û±ä¼°×ÔÊÊÓ¦¹âѧУÕý. ¼¤¹âÔÓÖ¾, 2025(10): 27-33. \end{thebibliography} \end{document} |
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