Abstract
Nanoprecision surface manufacturing has been widely used in many high-tech fields such as VLSI (very large scale integrated circuit) manufacturing and high-precision optical manufacturing, which provides strong support for the development of national defense, national economy, science and technology. Taking integrated circuit (IC) as an example, high-precision wafer processing and high-precision lithography objective lenses processing are two crucial technologies in IC manufacturing. For wafer surface manufacturing, the process with feature dimensions less than 14 nm requires that the wafer surface roughness Ra with a diameter of 300 mm reaches 0.1 nm, and the material thickness deviation should be controlled to the scale of 30 nm, i.e. 1/10 billion of the diameter, and the surface/ subsurface has no damages and defects such as cracks, residual stresses and scratches; for the lithography objective lens, the lithography process with a feature dimension of 14 nm uses extreme ultraviolet (EUV) light with a wavelength of 13.5 nm, and its optical parts of the lithography system require full-frequency error control: the low-frequency surface error (the spatial period is 1 mm to the full aperture of the optical parts) must reach 0.25 nm RMS, the intermediate frequency roughness error (the period is 1 μm–1 mm) must be about 0.2 nm RMS, and the high-frequency roughness error (the period is less than 1 μm) must be less than 0.1 nm RMS.
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Lu, B. et al. (2023). Nano/Sub-nanometer Precision Manufacturing. In: Lu, B. (eds) Fundamental Research on Nanomanufacturing. Reports of China’s Basic Research. Springer, Singapore. https://doi.org/10.1007/978-981-19-8975-9_3
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DOI: https://doi.org/10.1007/978-981-19-8975-9_3
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