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Proceedings Paper

GaAs wafer overlay performance affected by annealing heat treatment: II
Author(s): Ying Liu; Iain Black
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Paper Abstract

Further analysis on how wafer distortion affecting the overlay performance during annealing treatment in GaAs wafer fabrication was conducted quantitatively using MONO-LITH software. The experimental results were decomposed as wafer translation, scaling at X and Y direction, rotation and orthogonality. The grid residual was used to describe non- correctable distortion of the wafers, which fits the equations given below: Residual equals Measured - Modeled, which is not a modeled component. The Vector Map displays distribution of error vectors over the wafer or field for various components or overall effect. Based on the component analysis that the misalignment caused by translation and scaling can be compensated by heat treatment if the wafer is placed at a favorable orientation. This can help mitigate the effects of substrate quality in manufactory.

Paper Details

Date Published: 16 July 2002
PDF: 11 pages
Proc. SPIE 4689, Metrology, Inspection, and Process Control for Microlithography XVI, (16 July 2002); doi: 10.1117/12.473440
Show Author Affiliations
Ying Liu, ANADIGICS, Inc. (United States)
Iain Black, ANADIGICS, Inc. (United States)


Published in SPIE Proceedings Vol. 4689:
Metrology, Inspection, and Process Control for Microlithography XVI
Daniel J. C. Herr, Editor(s)

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