Masked ion beam lithography and direct structuring on curved surfaces

Loeschner, Hans; Buschbeck, H.; Ecker, Martin; Horner, C.; Platzgummer, Elmar; Stengl, G.; Zeininger, Michaela; Ruchhoeft, Paul; Wolfe, J. C.

doi:10.1117/12.482716

Cited by 1 publication

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“…Reactive ion etching also uses either a resist or an inorganic pattern to mask the pattern transfer, ditto with ion milling. Recently, there is a proposal to take advantage of the large DOF of ionbeam proximity image for curved surfaces 26 . Direct writing ion-beam machines were available as early as 1979.…”

Section: Marching Of the Ion-beam Lithography Horsementioning

confidence: 99%

Marching of the microlithography horses: electron, ion, and photon: past, present, and future

Lin

2007

SPIE Proceedings

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Microlithography patterning employs one of three media; electron, ion, and photon. They are in a way like horses, racing towards the mainstream. Some horses such as electrons run fast but repel each other. Ion beams behave like electron beams but are less developed. The photon beam is the undisputed workhorse, taking microlithography from the 5-µm minimum feature size to 32-nm half pitch. This paper examines the history of microlithography in pattern generation, proximity printing, and projection printing, then identifies the strong and weak points of each technology. In addition to ion-beam and e-beam lithography, the coverage of optical lithography spans the wavelength from 436 to 13.5 nm. Our learning from history helps us prevent mistakes in the future. In almost all cases, making or using the mask presents one of the limiting problems, no matter the type of beams or the replication method. Only the maskless method relieves us from mask-related problems. A way to overcome the low throughput handicap of maskless systems is to use multiple e-beam direct writing, whose imaging lens can be economically and compactly fabricated using MEMS techniques.In a way, the history of microlithography parallels that of aviation. Proximity printing is like the Wright-Brothers' plane; 1X projection printing, single-engine propeller plane with unitized body; reduction step-and-repeat projection printing, multi-engine commercial airliner; scanners, jet airliners. Optical lithography has improved in many ways than just increasing NA and reducing wavelength just as the commercial airliners improving in many other areas than just the speed. The SST increased the speed of airliners by more than a factor of two just as optical resolution doubled with double exposures. EUV lithography with the wavelength reduced by an order of magnitude is similar to the space shuttle increasing its speed to more than 10 times that of the SST. Multiple-beam direct write systems are like helicopters. They do not need airports(masks) but we need a lot of beams to carry the same payload.Keywords: Microlithography, e-beam lithography, ion-beam lithography, optical lithography, x-ray lithography, EUV lithography, microlithography history, microlithography outlook IntroductionMicrolithography, a specific technology used to pattern IC circuits as early as 1958, is coming to its 50 th anniversary. Initially, it was as straightforward as ancient-day lithographers replicating patterns carved in stone masks. However, as circuit dimensions continued to shrink, more care had to be taken for microlithography. Very early on, people recognized that there was a limit to photon-based patterning techniques, higher energy particles or shorter wavelengths such as electrons and ions were proposed as the patterning carrier. "Optical techniques for fabricating devices are generally limited to > 5 µm linewidths in practical production by the diffraction effects", according to Herriot 1 in 1975. He must have in mind proximity printing at a large mask-to-wafer gap using near-uv...

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Section: Marching Of the Ion-beam Lithography Horsementioning

confidence: 99%

Marching of the microlithography horses: electron, ion, and photon: past, present, and future

Lin

2007

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

Masked ion beam lithography and direct structuring on curved surfaces

Cited by 1 publication

References 6 publications

Marching of the microlithography horses: electron, ion, and photon: past, present, and future

Marching of the microlithography horses: electron, ion, and photon: past, present, and future

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