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5 March 2022 New high repeatability wafer geometry measurement technique for full 200mm and 300mm blank wafers
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Proceedings Volume 12008, Photonic Instrumentation Engineering IX; 120080A (2022) https://doi.org/10.1117/12.2607315
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
Wave Front Phase Imaging (WFPI), a new wafer geometry technique, is presented, that acquires 7.65 million data points in 5 seconds on a full 300mm wafer providing lateral resolution of 96µm. The system has high repeatability with root-mean-square (RMS) standard deviation (σRMS) in the single digit nm for the global wafer geometry and in the sub ångström (Å = 10-10 m) range for the full-wafer nanotopography for both 200mm and 300mm blank silicon wafer. WFPI can collect data on the entire wafer to within a single pixel, in our case 96µm, away from the wafer edge roll off. The flatness of the silicon wafers used to manufacture integrated circuits (IC) is controlled to tight tolerances to help ensure that the full wafer is sufficiently flat for lithographic processing. Advanced lithographic patterning processes require a detailed map of the wafer shape to avoid overlay errors caused by depth-of-focus issues. We present WFPI as a new technique with high resolution and high data count acquired at very high speed.
Conference Presentation
© (2022) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Juan M. Trujillo-Sevilla, Álvaro Pérez-García, Óscar Casanova-González, Miriam Velasco-Ocaña, Sabato Ceruso, Ricardo Oliva-García, Óscar Gómez-Cárdenes, Javier Martín-Hernández, Alex Roqué-Velasco, José Manuel Rodríguez-Ramos, and Jan O. Gaudestad "New high repeatability wafer geometry measurement technique for full 200mm and 300mm blank wafers", Proc. SPIE 12008, Photonic Instrumentation Engineering IX, 120080A (5 March 2022); https://doi.org/10.1117/12.2607315
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KEYWORDS
Semiconducting wafers

Photovoltaics

Cameras

Silicon

Data acquisition

Gaussian filters

Wavefronts

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