Chinese Optics Letters, 2023, 21 (7): 071204, Published Online: Jul. 24, 2023  

Improving accuracy and sensitivity of diffraction-based overlay metrology

Author Affiliations
1 School of Microelectronics, Shanghai University, Shanghai 200072, China
2 Department of Precision Optics Engineering, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract
Overlay (OVL) for patterns placed at two different layers during microchip production is a key parameter that controls the manufacturing process. The tolerance of OVL metrology for the latest microchip needs to be at nanometer scale. This paper discusses the influence on the accuracy and sensitivity of diffraction-based overlay (DBO) after developing inspection and after etching inspection by the asymmetrical deformation of the OVL mark induced by chemical mechanical polishing or etching. We show that the accuracy and sensitivity of DBO metrology can be significantly improved by matching the measuring light wavelength to the thickness between layers and by collecting high-order diffraction signals, promising a solution for future OVL metrology equipment.

Wenhe Yang, Nan Lin, Xin Wei, Yunyi Chen, Sikun Li, Yuxin Leng, Jianda Shao. Improving accuracy and sensitivity of diffraction-based overlay metrology[J]. Chinese Optics Letters, 2023, 21(7): 071204.

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