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Proceedings Paper

CD changes of 193-nm resists during SEM measurement
Author(s): Takanori Kudo; Jun-Bom Bae; Ralph R. Dammel; Woo-Kyu Kim; Douglas S. McKenzie; M. Dalil Rahman; Munirathna Padmanaban; Waiman Ng
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Paper Abstract

CD linewidth change during SEM inspection has been one of the issues encountered in the introduction of 193 nm resists. As a general tendency, the methacrylate resists exhibit faster line width reduction than the cycloolefin- maleic anhydride (COMA) systems; however, other resist components as well as CD SEM settings paly an important role. Based on the exposure time vs. CD loss, the line width slimming (LSW) is found to proceed in three steps, which are assigned as: 1) chemical change of outer resist layer, 2) evaporation of volatiles and 3) bulk chain scission or deprotection. Countermeasures for CD degradation are proposed form both the formulation and process sides. A calculation of e-beam penetration depth suggests that deprotection, chain scission and other reactions occur in the first 20-40nm, and these reaction rates combined with thermal effects determine LWS. The CD SEM measurement method has been improved to minimize e-beam exposure and to spread out the thermal load over a larger period of time. An optimized formulation exhibits less than 0.2% LWS per measurement with the improved CD measurement program.

Paper Details

Date Published: 24 August 2001
PDF: 11 pages
Proc. SPIE 4345, Advances in Resist Technology and Processing XVIII, (24 August 2001); doi: 10.1117/12.436847
Show Author Affiliations
Takanori Kudo, Clariant Corp. (United States)
Jun-Bom Bae, Clariant Corp. (United States)
Ralph R. Dammel, Clariant Corp. (United States)
Woo-Kyu Kim, Clariant Corp. (United States)
Douglas S. McKenzie, Clariant Corp. (United States)
M. Dalil Rahman, Clariant Corp. (United States)
Munirathna Padmanaban, Clariant Corp. (United States)
Waiman Ng, KLA-Tencor Corp. (United States)

Published in SPIE Proceedings Vol. 4345:
Advances in Resist Technology and Processing XVIII
Francis M. Houlihan, Editor(s)

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