FIRM: a new software tool for calibration of lithography simulation

Dietmar Krueger; Christian K. Kalus; Andreas Erdmann; Christoph M. Friedrich; Rainer Kaesmaier; Axel Feike

doi:10.1117/12.346888

28 April 1999 FIRM: a new software tool for calibration of lithography simulation

Dietmar Krueger, Christian K. Kalus, Andreas Erdmann, Christoph M. Friedrich, Rainer Kaesmaier, Axel Feike

Proceedings Volume 3741, Lithography for Semiconductor Manufacturing; (1999) https://doi.org/10.1117/12.346888
Event: Microelectronic Manufacturing Technologies, 1999, Edinburgh, United Kingdom

Abstract

In general, simulation requires a thorough understanding of the physics and/or chemistry of the processes. This should lend itself of models which can be used to establish simulation software. In addition, for a simulation to be successful, a calibration of the model is needed. A good model using bad parameters returns bad results. In lithography simulation there are settings of parameters which are well known. Others are less known and may be hard to obtain. A typical example is the development parameters, or parameters describing the reaction mechanism for chemically amplified resist. To support the user of simulation software in the process of finding proper input parameters, the new software package FIRM has been developed and will be presented in this paper, together with applications. FIRM uses models for the optical or e-beam lithography, the same as SOLID-C and SELID, and determines any set of coefficients from given experimental observations. From an initial set of coefficients, it tries to fit calculations to observations. FIRM accepts various types of measurements, e.g. thickness tables of the resist or focus-exposure matrices. In addition, the user selects from a wide list of resist models the parameters to be refined. FIRM then tries to find correlation between the parameters and the differences between calculation and observation. In an iterative process 'best' parameters are determined. The validity of the algorithm is verified against well known test cases. Next, applications of FIRM to several new chemically amplified resists for DUV will be presented using different types of experimental input.

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Dietmar Krueger, Christian K. Kalus, Andreas Erdmann, Christoph M. Friedrich, Rainer Kaesmaier, and Axel Feike "FIRM: a new software tool for calibration of lithography simulation", Proc. SPIE 3741, Lithography for Semiconductor Manufacturing, (28 April 1999); https://doi.org/10.1117/12.346888

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KEYWORDS

Calibration

Matrices

Lithography

Algorithm development

Computer simulations

Optimization (mathematics)

Chemically amplified resists

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