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27 December 2002 LithoScope: Simulation Based Mask Layout Verification with Physical Resist Model
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Simulation based mask layout verification and optimization is a cost effective way to ensure high mask performance in wafer lithography. Because mask layout verification serves as a gateway to the expensive manufacturing process, the model used for verification must have superior accuracy than models used upstream. In this paper, we demonstrate, for the first time, a software system for mask layout verification and optical proximity correction that employs a physical resist development model. The new system, LithoScope, predicts wafer patterning by solving optical and resist processing equations on a scale that is until recently considered unpractical. Leveraging the predictive capability of the physical model, LithoScope can perform mask layout verification and optical proximity correction under a wide range of processing conditions and for any reticle enhancement technology without the need for multiple model development. We show the ability for physical resist model to change iso-focal bias by optimizing resist parameters, which is critical for matching the experimental process window. We present line width variation statistics and chip level process window predictions using a practical cell layout. We show that LithoScope model can accurately describe the resist-intensive poly gate layer patterning. This system can be used to pre-screen mask data problems before manufacturing to reduce the overall cost of the mask and the product.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Qi-De Qian "LithoScope: Simulation Based Mask Layout Verification with Physical Resist Model", Proc. SPIE 4889, 22nd Annual BACUS Symposium on Photomask Technology, (27 December 2002);

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