共查询到19条相似文献,搜索用时 437 毫秒
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文章运用Monte Carlo方法模拟具有高斯分布特征的低能入射电子束斑在PMMA-村底中的复杂散射过程,分别得到了电子束在抗蚀剂中的穿透深度和能量沉积分布圈,并利用模拟结果进行邻近效应的修正.得到修正后的剂量数据文件。结果表明:采用修正后的剂量曝光,光刺胶中的能量沉积比较均匀.曝光分辨率有较大幅度的提高。该研究将对低能电子束曝光技术的定量研究和邻近效应修正技术的探索具有较高的理论指导意义。 相似文献
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按照逻辑器件发展的节点顺序,依次论述了各种光学邻近效应修正技术:基于经验的光学邻近效应修正、基于模型的光学邻近效应修正、曝光辅助图形、光源和掩模版的优化、反演光刻技术以及两次曝光技术等。概括了各种技术出现的逻辑技术节点、数据处理流程、修正的表现形式和效果、优势和发展前景等。最后就先导光刻工艺的研发模式(先建立光学和光刻胶模型,再进行"计算光刻"),论证了光刻工艺的研发必须和光学邻近效应修正的数据流程实现互动的观点,即任何光刻工艺参数的变动都会影响到"计算光刻"模型的准确性,需要重新进行修正,以避免原计算可能导致的失败。因此,光学邻近效应修正是先导光刻工艺研发的核心。 相似文献
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对低能电子在光刻胶和衬底中的复杂散射过程进行分析和物理建模,采用Monte Carlo方法进行模拟研究。利用Browning拟合公式来解决Mott弹性散射截面计算速度慢的问题,采用D.C.Joy和S.Luo修正的Bethe能量损耗公式计算低能电子在固体中的能量损耗。通过跟踪电子的散射轨迹、计算电子的能量沉积密度、结合显影阈值模型,模拟出了电子束光刻的三维显影轮廓图。据此研究了入射电子束能量、剂量、光刻胶厚度、衬底材料、衬底和光刻胶形貌等不同条件下电子束曝光邻近效应的影响。此外,还将具有高斯分布特征的低能电子束入射产生的沉积能量密度进行移动处理,模拟一个以"T"字型为代表的较为复杂图形的电子束曝光过程,通过三维显影轮廓模拟图比较直观地显示了邻近效应的影响,并演示了采用电子束曝光剂量补偿的方法实现邻近效应校正的效果。 相似文献
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本文从光学邻近效应的机理出发,基于区域划分掩模特征线条,实施曝光剂量控制,从而达到光学邻近效应的精细校正。通过模拟测试图形得到改进后的掩模图形畸变率,与传统曝光剂量校正法相比,减少了约4%。 相似文献
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Yasuhide Machida Noriaki Nakayama Sumio Yamamoto Shigeru Furuya 《Microelectronic Engineering》1984,2(4):245-257
A proximity-effect correction method for VLSI patterns has been developed. In this method, a dose ratio has been introduced as a control parameter for the negative- resist thickness after development, in addition to the proximity parameters.A new technique has been used to obtain the proximity parameters. By using the dose ratio and the proximity parameters, both the exposure dose and the size of the irradiated shape are easily determined.A pattern accuracy of ±0.1 μm and a uniform resist of the desired thickness were obtained. The computation time is proportional to 1.2 power of pattern density, and is 100 seconds on a 1.5-MIPS computer when correcting for 104 shapes in a pattern whose pattern density is 104. 相似文献
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准确提取电子散射参数是确保纳米级电子束光刻邻近效应校正精度的关键。采用了一种不基于线宽测量和非线性曲线拟合的电子散射参数提取的方法。邻近效应校正的近似函数采用双高斯分布,其中η的提取是基于设计线宽变化与相应曝光剂量之间的线性关系进行拟合而得;α和β的提取则是分别根据前散射和背散射的范围设计特定的提取版图,并根据电子束邻近效应产生的特殊现象进行参数值的确定。根据此方法提取了150nm厚负性HSQ抗蚀剂层在50kV入射电压下的散射参数,并将其应用于邻近效应校正曝光实验中,很好地克服了电子束邻近效应的影响,验证了此方法提取电子束曝光邻近效应校正参数的实用性及准确性。 相似文献
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This paper describes an interactive visualisation CAD package, XPROX, which has been developed to simulate and visualise the exposures of submicron pattern features in E-beam lithography. XPROX provides visualisation and iterative proximity correction for different pattern shapes and exposure conditions. For patterns comprising a large number of shapes, where there is a need to identify the proximity effect in critical areas quickly and automatically, a technique is described using XPROX whereby only the critical areas are proximity corrected, thus saving significantly on computing resources and data preparation time. 相似文献
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《Microelectronic Engineering》2006,83(2):336-344
In most of the proximity effect correction schemes, a two-dimensional model of proximity effect is employed by ignoring or averaging the variation of exposure along the depth dimension in the resist. However, as the feature size continues to decrease, the relative variation becomes significant so that it may need to be taken into account in proximity effect correction. In this study, the three-dimensional (3-D) proximity effect is analyzed in detail through computer simulation as a first step toward developing a 3-D proximity effect correction scheme. Effects of the parameters such as beam energy, resist thickness, feature size, developing threshold, etc., on the 3-D spatial distribution of exposure in the resist, in particular, depth-dependent proximity effect, are considered in the analysis. Results from the extensive simulation are presented in this paper. 相似文献
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《Microelectronic Engineering》2007,84(5-8):814-817
We report on a fogging effect correction (FEC) method to be used in high-resolution e-beam lithography (EBL). In the new version of the previously presented PROX-In software tool, originally developed to determine the numerical proximity parameters for the proximity effect correction (PEC), was now implemented also the possibility of correcting large-range pattern distortion effects in connection with the modified PROXECCOTM tool from PDF Solutions. This allows a complex exposure optimization by dose modulation of long-range fogging and/or loading effects with the standard PEC method using the same corrector. The presented approach is fast and effective, does not use any special additional technology steps and uses only standard high-resolution measuring techniques. The reviewed method was successfully implemented into mask production at different absorber stacks. It is also used for the determination of FEC input parameters and complex exposure optimization in e-beam direct write and step and flash imprint lithography (SFIL) template manufacturing with sub-50 nm resolution capability. 相似文献
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电子束光刻技术与图形数据处理技术 总被引:3,自引:2,他引:1
介绍了微纳米加工领域的关键工艺技术——电子束光刻技术与图形数据处理技术,包括:电子束直写技术、电子束邻近效应校正技术、光学曝光系统与电子束曝光系统之间的匹配与混合光刻技术、电子束曝光工艺技术、微光刻图形数据处理与数据转换技术以及电子束邻近效应校正图形数据处理技术。重点推荐应用于电子束光刻的几种常用抗蚀剂的主要工艺条件与参考值,同时推荐了可以在集成电路版图编辑软件L-Edit中方便调用的应用于绘制含有任意角度单元图形和任意函数曲线的复杂图形编辑模块。 相似文献
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以光子晶体Fabry-Perot腔为例,提出了全电子束光刻制作光子晶体波导器件的解决方案. 曝光光子晶体区域时采用较小的曝光步长,同时引入额外的邻近效应补偿本征邻近效应,从而获得高质量的掩模图形. 曝光较长的输入、输出波导时,采用较大的曝光步长以提高电子束扫描速度,同时在波导的写场(write-field)过渡区引入一个锥形波导以减小写场拼接误差对光传输效率的影响. 实验结果证明,这种方法既能保持小孔制作需要的高精度,也能很大程度上提高光刻效率. 相似文献