Effect of molecular weight on poly(methyl methacrylate) resolution

Maroun Khoury, David K. Ferry

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


Electron‐beam lithography’s resolution limit is greater than the beam diameter due to resist limitations as well as electron interaction with solids. We examine the effect of molecular weight on the resolution of poly(methyl methacrylate) (PMMA). The experimental procedure uses thin Si3N4 in order to reduce the backscattered electron contribution to the exposure, and the resist contrast standard deviation σ was determined. Molecular weights of 950×103, 120×103, and 15×103 amu were used. It is found that relatively equivalent exposure and resolution are found in each case, and that the entanglement threshold is either lower than thought, or is not a factor in the resolution of PMMA. Lines as small as 7 nm are found in the highest molecular weight.
Original languageEnglish
Pages (from-to)75-79
JournalJournal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures
Issue number1
StatePublished - 1996

Bibliographical note

© 1996 American Vacuum Society.


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