Focus blur model to enhance lithography model for optical proximity correction

Qiaolin Zhang; Hua Song; Kevin Lucas

doi:10.1117/12.802509

17 October 2008 Focus blur model to enhance lithography model for optical proximity correction

Qiaolin Zhang, Hua Song, Kevin Lucas

Proceedings Volume 7122, Photomask Technology 2008; 71223Y (2008) https://doi.org/10.1117/12.802509
Event: SPIE Photomask Technology, 2008, Monterey, California, United States

Abstract

The concept of focus blur encompasses the effect of laser bandwidth longitudinal chromatic aberration and scanner stage vertical vibration. The finite bandwidth of excimer laser source causes a corresponding finite distribution of focal planes in a range of 100nm or larger for the optical lithography system. Similarly, scanner vertical stage vibration puts the wafer in a finite distribution of focal planes. Both chromatic aberration and vertical stage vibration could introduce significant CD errors, hence can no longer be ignored in current lithography processes development and OPC development that require CD control within a few nanometers. We developed several methodologies to model the laser chromatic aberration and vertical stage vibration in OPC (Optical Proximity Correction) modeling tool. Extensive simulations were done to calculate chromatic aberration and vertical stage vibration focus blur's impact on lithography patterning for a variety of test structures. Chromatic aberration and vertical stage vibration focus blur effect was further included as an regression term in experimental OPC model calibration to capture its impact on litho patterning, and significant benefit to OPC model calibration was observed.

Citation Download Citation

Qiaolin Zhang, Hua Song, and Kevin Lucas "Focus blur model to enhance lithography model for optical proximity correction", Proc. SPIE 7122, Photomask Technology 2008, 71223Y (17 October 2008); https://doi.org/10.1117/12.802509

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KEYWORDS

Chromatic aberrations

Optical proximity correction

Calibration

Lithography

Optical lithography

Scanners

3D scanning

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