Molecular weight and processing effects on the dissolution properties of thin poly(methyl methacrylate) films
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Authors
Kokkinis, A.
Valamontes, E. S.
Goustouridis, D.
Ganetsos, T.
Beltsios, K.
Raptis, I.
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Elsevier
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peer reviewed
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Microelectronic Engineering
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Description
An experimental set-up based on multiwavelength interferometry, is applied in order to study in-situ the dissolution process of thin resist films. The interference function was the basis for a fitting algorithm, which analyses the experimental data and evaluates the progress of the resist thickness with time. The dissolution of various PMMA molecular weights (15 K, 350 K, 996 K) and resist thicknesses (20-300 nm), in various developers, consisting of mixtures of methyl iso butyl ketone (MIBK), iso propanol (IPA), H2O at various relative concentrations, was studied. Surface dissolution inhibition was shown in unexposed resists with high molecular weights and increased thickness in the case of MIBK-IPA 1-1 and IPA-H2O 7-3 developers. After that the whole dissolution process evolved at a steady rate. Dissolution of thick films proved to be unpredictable showing complex dissolution curves. Low molecular weight resists presented a smooth dissolution curve without dissolution inhibition. Samples exposed with small DUV doses, exhibited dissolution behavior similar to the unexposed cases, whereas high exposure doses, within the lithographically useful range, led to smooth dissolution behavior. In the case of MIBK-IPA 1-3 developer significant swelling was observed. (C) 2007 Elsevier B.V. All rights reserved.
Description
Keywords
poly(methyl methacrylate), thin film, lithography, dissolution, multiwavelength interferometry, electron-beam lithography, polymer-films, multiwavelength interferometry, photoresist dissolution, resist, poly(methylmethacrylate), resolution, nanolithography, fabrication, thickness
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<Go to ISI>://000253030100018
http://ac.els-cdn.com/S0167931707003590/1-s2.0-S0167931707003590-main.pdf?_tid=3e9b4d2a84b324b83e33d8026032e690&acdnat=1339662523_b98674714ec07cd7027fce7366efbdd9
http://ac.els-cdn.com/S0167931707003590/1-s2.0-S0167931707003590-main.pdf?_tid=3e9b4d2a84b324b83e33d8026032e690&acdnat=1339662523_b98674714ec07cd7027fce7366efbdd9
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en
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Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών