New thermally crosslinkable electron-beam resists

3. Prediction of the gel clearing dose

A. F. Miles, I. J. McEwen, R. Ferguson

Research output: Contribution to journalArticle

Abstract

A theoretical description of the electron exposure dose required to solubilize the gel fraction of pre-crosslinked positive resists was first proposed by Suzuki and Ohnishi. These authors proposed that the important factors affecting the sensitivity of pre-crosslinked resists are the weight-average molar mass of the primary polymer (M°W), the main-chain scission efficiency and the average number of crosslinked units per weight-average molecule (d). In this paper we re-examine these conclusions and show that, for the practical situation, d and M°W should not be regarded as independent variables. Using a functional relationship between d and molar mass, and expressions due to Charlesby for the change in the gel fraction beyond the gel point, equations are developed to predict the critical exposure dose for the cases where degradation occurs (i) exclusively via scission of the crosslinks and (ii) exclusively by scission of main-chain units. Experimental data for pre-crosslinked copolymers of monomethyl itaconate and methyl methacrylate show good agreement with values calculated assuming that degradation of the gel occurs only via main-chain scission. © 1992.

Original languageEnglish
Pages (from-to)1937-1940
Number of pages4
JournalPolymer
Volume33
Issue number9
Publication statusPublished - 1992

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clearing
cleavage
gels
electron beams
dosage
predictions
degradation
copolymers
sensitivity
polymers
molecules
electrons

Keywords

  • electron-beam lithography
  • gel clearing dose
  • gel degradation
  • resist materials

Cite this

Miles, A. F., McEwen, I. J., & Ferguson, R. (1992). New thermally crosslinkable electron-beam resists: 3. Prediction of the gel clearing dose. Polymer, 33(9), 1937-1940.
Miles, A. F. ; McEwen, I. J. ; Ferguson, R. / New thermally crosslinkable electron-beam resists : 3. Prediction of the gel clearing dose. In: Polymer. 1992 ; Vol. 33, No. 9. pp. 1937-1940.
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Miles, AF, McEwen, IJ & Ferguson, R 1992, 'New thermally crosslinkable electron-beam resists: 3. Prediction of the gel clearing dose', Polymer, vol. 33, no. 9, pp. 1937-1940.

New thermally crosslinkable electron-beam resists : 3. Prediction of the gel clearing dose. / Miles, A. F.; McEwen, I. J.; Ferguson, R.

In: Polymer, Vol. 33, No. 9, 1992, p. 1937-1940.

Research output: Contribution to journalArticle

TY - JOUR

T1 - New thermally crosslinkable electron-beam resists

T2 - 3. Prediction of the gel clearing dose

AU - Miles, A. F.

AU - McEwen, I. J.

AU - Ferguson, R.

PY - 1992

Y1 - 1992

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AB - A theoretical description of the electron exposure dose required to solubilize the gel fraction of pre-crosslinked positive resists was first proposed by Suzuki and Ohnishi. These authors proposed that the important factors affecting the sensitivity of pre-crosslinked resists are the weight-average molar mass of the primary polymer (M°W), the main-chain scission efficiency and the average number of crosslinked units per weight-average molecule (d). In this paper we re-examine these conclusions and show that, for the practical situation, d and M°W should not be regarded as independent variables. Using a functional relationship between d and molar mass, and expressions due to Charlesby for the change in the gel fraction beyond the gel point, equations are developed to predict the critical exposure dose for the cases where degradation occurs (i) exclusively via scission of the crosslinks and (ii) exclusively by scission of main-chain units. Experimental data for pre-crosslinked copolymers of monomethyl itaconate and methyl methacrylate show good agreement with values calculated assuming that degradation of the gel occurs only via main-chain scission. © 1992.

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