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• W1968002690 abstract "The interpretation of optical measurements is based on a simulation and regression program which minimizes the difference between calculated and measured spectra. A complicated multilayer structure is usually modelled as a system built up of plane-parallel thin films consisting a mixture of two (or more) components. The quality of this interpretation thus depends on the realism of the proposed optical model, on the quality of the reference files for the refractive indices, on the theory of the optical response of mixed layers and on the regression algorithm. For depth profiling a simple model consisting of a few layers can be used to get a first approximation of the thickness of the buried layer and of a possible top layer. The next step is to replace this simple model by a more complex model. Two approaches can be followed for profiles with (a) unknown or (b) known depth variations. Ion-implanted, electrochemically etched silicon and other examples will be presented. Traditionally the evaluation of spectroscopic ellipsometry and reflectometry needs a predetermined multilayer optical model which possesses initial parameters close enough to the targeted ones, because a non-linear gradient descent algorithm uses the initial guess. However, erroneous results may appear when the algorithm falls into the trap of a local minimum. Backpropagation trained feed-forward neural networks proved to be able to give good initial estimations in most cases for avoiding problems. Moreover, a set of neural networks can be trained to perform successive refining of the estimation regions, providing the capability of real-time monitoring of process parameters or fast evaluation of wafer mapping measurements." @default.
• W1968002690 created "2016-06-24" @default.
• W1968002690 creator A5016185123 @default.
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• W1968002690 date "2000-03-01" @default.
• W1968002690 modified "2023-09-24" @default.
• W1968002690 title "Non-destructive optical depth profiling and real-time evaluation of spectroscopic data" @default.
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• W1968002690 doi "https://doi.org/10.1016/s0040-6090(99)00904-9" @default.
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