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    • 1. 发明授权
    • STI CMP under polish monitoring
    • STI CMP在抛光监测下
    • US08852968B2
    • 2014-10-07
    • US13768870
    • 2013-02-15
    • Liang LiZheng ZouHuang LiuAlex See
    • Liang LiZheng ZouHuang LiuAlex See
    • H01L21/66
    • H01L22/12G01B2210/56
    • Methods of deducing oxide thickness using calculated and measured scattering spectra are provided. Embodiments include depositing an oxide over a semiconductor wafer, reducing the oxide from a portion of the semiconductor wafer, and deducing a thickness of oxide remaining at a location within the portion using scatterometric metrology. Embodiments further include deducing the thickness by: calculating scattering spectra for a plurality of oxide thicknesses, producing calculated scattering spectra, monitoring scattering spectra at the location within the portion of the semiconductor wafer, comparing the monitored scattering spectra at the location to the calculated scattering spectra, determining a closest matching calculated scattering spectra to the monitored scattering spectra at the location, and obtaining an oxide thickness corresponding to the closest matching calculated scattering spectra.
    • 提供了使用计算和测量的散射光谱推导氧化物厚度的方法。 实施例包括在半导体晶片上沉积氧化物,从半导体晶片的一部分还原氧化物,并使用散射测量法推算残留在该部分内部的氧化物的厚度。 实施例还包括通过以下方式推导厚度:计算多个氧化物厚度的散射光谱,产生计算的散射光谱,监测半导体晶片部分内的位置处的散射光谱,将该位置处的所监视的散射光谱与计算出的散射光谱进行比较 确定与所述位置处的所监视的散射光谱最接近的匹配计算的散射光谱,以及获得对应于最接近的匹配计算的散射光谱的氧化物厚度。