Dr. Fan Tu Profile

Dr. Fan Tu

at Carl Zeiss SMT GmbH

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Publications (3)

SPIE Journal Paper | 7 September 2021 Open Access

Pushing the limits of EUV mask repair: addressing sub-10 nm defects with the next generation e-beam-based mask repair tool

Tilmann Heil, Michael Waldow, Renzo Capelli, Horst Schneider, Laura Ahmels, Fan Tu, Johannes Schöneberg, Hubertus Marbach

JM3, Vol. 20, Issue 03, 031013, (September 2021) https://doi.org/10.1117/12.10.1117/1.JMM.20.3.031013

KEYWORDS: Photomasks, Extreme ultraviolet, Critical dimension metrology, Scanning electron microscopy, Extreme ultraviolet lithography, Scanners, Image processing, Cadmium, Manufacturing, Image analysis

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Proceedings Article | 6 October 2020 Presentation + Paper

High-end EUV photomask repairs for 5nm technology and beyond

Horst Schneider, Fan Tu, Laura Ahmels, Bartholomaeus Szafranek, Katharina Gries, Daniel Rhinow, Sebastian Vollmar, Andreas Krugmann, Ralf Schoenberger, Walter Pauls, Andreas Verch, Renzo Capelli, Alice Vincenzo, Grizelda Kersteen, Hubertus Marbach, Michael Waldow

Proceedings Volume 11518, 1151808 (2020) https://doi.org/10.1117/12.2572879

KEYWORDS: Extreme ultraviolet, Photomasks, Electron beams, Scanning electron microscopy, Semiconductors, Manufacturing, Extreme ultraviolet lithography, Lithography, Double patterning technology, Deep ultraviolet

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Proceedings Article | 26 September 2019 Presentation + Paper

SEM AutoAnalysis for reduced turnaround time and to ensure repair quality of EUV photomasks

Kokila Egodage, Fan Tu, Horst Schneider, Christian Hermanns, Grizelda Kersteen, Bartholomaeus Szafranek, Kristian Schulz

Proceedings Volume 11147, 111471G (2019) https://doi.org/10.1117/12.2538474

KEYWORDS: Photomasks, Extreme ultraviolet, Scanning electron microscopy, Extreme ultraviolet lithography, Manufacturing, Back end of line, Image analysis, Semiconductors, Multilayers, Scanners

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With the semiconductor industry tending towards adding multiple layers consisting of EUV technology in high-end manufacturing and the production of many EUV scanners to meet customer demands, novel approaches for EUV defect review are being readily investigated. The successor of the quasi industry standard AIMS and sole actinic defect review tool available currently is AIMS EUV. As the industry already introduced this newcomer in the manufacturing environment, other steps in the workflow were forced to adapt to the new technology. One example is the automated aerial image analysis process where the DUV aerial image analysis software, AIMS AutoAnalysis (AAA), was enhanced for the EUV solution in order to handle high resolution EUV images. This was a necessary step for full automation similar to the process achieved with AIMS and AAA. Another important domain in the back end of line is defect repair where the e-beam based repair tool MeRiT is also the quasi standard in the mask manufacturing industry especially for high-end photomasks. After undergoing changes to keep up with shrinking feature sizes and complex repairs MeRiT tools were able to overcome these challenges and fulfill the current industry demands and expectations. For mask makers timely supply of error free high-quality masks is of the essence which can be further ensured by introducing a higher level of automation to the repair workflow. Following a similar approach to the optical counterpart, a digital solution known as SEM AutoAnalysis (SAA) has been developed. With SAA, a quick and fully automated SEM image-based quality assessment after a repair of a photomask is readily achievable. Moreover, the repair technicians benefit vastly by having the complete repair history of a defect for their decision-making process which would lead to a reduction of the turnaround time. As a consequence, unnecessary time wastes during mask un/loading cycles can be avoided. The myriad data produced in the BEOL, originating from different modalities, can be converted to meaningful information with the help of automation enabling technicians to make better decisions, reducing the risk of mishaps, improve repair quality and reliability of processes in general. Since mask defects that go through each tool are the same, data produced by different tools should retain that common denominator for an efficient assessment. This assessment needs to be applied to the areas of different modalities where a comparison is possible that led to the investigations to test the feasibility of combining SEM and EUV data. A comparison of SAA results with AIMS EUV measurements analyzed with AAA on the same photomask and defects are presented along with this proceeding. The results show that SAA can provide a valuable preliminary assessment of photomask repairs. Nevertheless, due to the nature of SEM based analysis, AIMS EUV technology remains mandatory for a final mask repair qualification and a complete specification check, i.e. mask repair verification. The outcome of this investigation paves the way towards a fully automated BEOL where different workflows and data originating from several tools in the mask shop can be interconnected and controlled.

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