Wafer-shape metrics based foundry lithography

Sungtae Kim; Frida Liang; Jeffrey Mileham; Damon Tsai; Eric Bouche; Sean Lee; Albert Huang; C. F. Hua; Ming Sheng Wei

doi:10.1117/12.2257799

28 March 2017 Wafer-shape metrics based foundry lithography

Sungtae Kim, Frida Liang, Jeffrey Mileham, Damon Tsai, Eric Bouche, Sean Lee, Albert Huang, C. F. Hua, Ming Sheng Wei

Proceedings Volume 10145, Metrology, Inspection, and Process Control for Microlithography XXXI; 101450P (2017) https://doi.org/10.1117/12.2257799
Event: SPIE Advanced Lithography, 2017, San Jose, California, United States

Abstract

As device shrink, there are many difficulties with process integration and device yield. Lithography process control is expected to be a major challenge due to tighter overlay and focus control requirement. The understanding and control of stresses accumulated during device fabrication has becoming more critical at advanced technology nodes. Within-wafer stress variations cause local wafer distortions which in turn present challenges for managing overlay and depth of focus during lithography. A novel technique for measuring distortion is Coherent Gradient Sensing (CGS) interferometry, which is capable of generating a high-density distortion data set of the full wafer within a time frame suitable for a high volume manufacturing (HVM) environment. In this paper, we describe the adoption of CGS (Coherent Gradient Sensing) interferometry into high volume foundry manufacturing to overcome these challenges. Leveraging this high density 3D metrology, we characterized its In-plane distortion as well as its topography capabilities applied to the full flow of an advanced foundry manufacturing. Case studies are presented that summarize the use of CGS data to reveal correlations between in-plane distortion and overlay variation as well as between topography and device yield.

Conference Presentation

Citation Download Citation

Sungtae Kim, Frida Liang, Jeffrey Mileham, Damon Tsai, Eric Bouche, Sean Lee, Albert Huang, C. F. Hua, and Ming Sheng Wei "Wafer-shape metrics based foundry lithography", Proc. SPIE 10145, Metrology, Inspection, and Process Control for Microlithography XXXI, 101450P (28 March 2017); https://doi.org/10.1117/12.2257799

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