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- W2313774617 abstract "The secondary electron signals of scanning electron microscopes (SEMs) are widely used in electron beam measurement systems in IC factories, since they reflect step-edge information of minute patterns. A theoretical approach to define the relationship of actual pattern edges and peaks of the secondary electron signal is necessary because of the difficulty of experimental determination.Currently, a modified diffusion model is employed to predict the secondary electron signal distribution at edges; however, its direct application for steep edges presents some problems. A cylindrical projection model is therefore proposed for both steep and gentle edges, in which the secondary electron emission area is defined by the surface included by a cylinder rather than the spheroids of conventional models.To establish the validity of the model, micro-edges were fabricated on silicon chips, and then evaluated by a metrological scanning electron microscope. Comparison of experimental and simulated results confirmed that the model predicted both peak position and edge gradient difference with good accuracy." @default.
- W2313774617 created "2016-06-24" @default.
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- W2313774617 date "1993-01-01" @default.
- W2313774617 modified "2023-09-25" @default.
- W2313774617 title "An Estimation of Secondary Electron Intensity Signal at Edges by Using Cylindrical Projection Model" @default.
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- W2313774617 doi "https://doi.org/10.9746/sicetr1965.29.133" @default.
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