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Automated Vickers hardness system with closed- loop control for polishing pads for semiconductor production

Huy, Le Nam Quoc and Hoa, Le Ngoc Quynh and Haq, Muhamad Amirul and Huynh, Tan-Thanh (2023) Automated Vickers hardness system with closed- loop control for polishing pads for semiconductor production. INSTRUMENTATION SCIENCE & TECHNOLOGY. ISSN 1073-9149

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Chemical mechanical polishing plays a pivotal role in enhancing the topography of wafers during semiconductor fabrication. The hardness of polishing pads holds great significance as it determines the material removal rate during the planarization process. Hence, precise determination of polishing pad hardness at both micro and macro scales is essential for optimizing the semiconductor polishing process, ensuring the prevention of wafer erosion or dishing. In this study, an automated system was developed for determining Vickers hardness of microporous polishing pads employing a closed-loop control method. The system was calibrated based on the relationship between load-unloading force and displacement observed in Vickers indentation experiments. The designed apparatus is not only successfully verified with standard values for Vickers reference blocks with less than 2% error, but it also demonstrated a smaller average relative error percentage than the commercial system using traditional open-loop measurement method. The closed-loop Vickers hardness apparatus proves to be a promising alternative for measuring hardness accurately, particularly in samples with noisy surfaces, rough surfaces, and porous microstructures.

Item Type: Article
Uncontrolled Keywords: Vickers hardness testing; closed-loop control technology; force displacement response; polishing pad hardness; semiconductor fabrication
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Q Science > QA Mathematics > QA76 Computer software
T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TS Manufactures
Divisions: Jurnal > Fakultas Teknik
Depositing User: Muhamad Amirul Haq
Date Deposited: 18 Mar 2024 01:51
Last Modified: 18 Mar 2024 01:51

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