Automated System for Optical Inspection of Defects in Resist-coated Non-patterned Wafer

0532029 - ÚPT 2021 RIV JO eng J - Journal Article
Knápek, Alexandr - Drozd, Michal - Matějka, Milan - Chlumská, Jana - Král, Stanislav - Kolařík, Vladimír
Automated System for Optical Inspection of Defects in Resist-coated Non-patterned Wafer.
Jordan Journal of Physics. Roč. 13, č. 2 (2020), s. 93-100. ISSN 1994-7607. E-ISSN 1994-7615
R&D Projects: GA MPO FV10618
Institutional support: RVO:68081731
Keywords : optical inspection * resist layer * non-patterned wafer * quality control
OECD category: Automation and control systems
Method of publishing: Open access
http://journals.yu.edu.jo/jjp/JJPIssues/Vol13No2pdf2020/1.html

Quality control of the resist coating on a silicon wafer is one of the major tasks prior to the exposition of patterns into the resist layer. Thus, the ability to inspect and identify the physical defect in the resist layer plays an important role. The absence of any unwanted defect in resist is an ultimate requirement for preparation of precise and functional micro- or nano-patterned surfaces. Currently used wafer inspection systems are mostly utilized in semiconductor or microelectronic industry to inspect non-patterned or patterned wafers (integrated circuits, photomasks,. etc.) in order to achieve high yield production. Typically, they are based on acoustic micro-imaging, optical imaging or electron microscopy. This paper presents the design of a custom optical-based inspection device for small batch lithography production that allows scanning a wafer surface with an optical camera and by analyzing the captured images to determine the coordinates (X, Y), the size and the type of the defects in the resist layer. In addition, software responsible for driving the scanning device and for advanced image processing is presented.
Permanent Link: http://hdl.handle.net/11104/0310631