Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. EPFL thesis
  4. On Advanced Large-Field Photolithography
 
doctoral thesis

On Advanced Large-Field Photolithography

Kirner, Raoul  
2019

The information age we live in today relies on highly integrated devices. They are fabricated with the help of photolithography, the patterning technique at the heart of their production. With the continuous demand for higher integration density to achieve ever growing performance levels, not only the front-end-of-line lithography, responsible for realizing the smallest structures, is under constant pressure for improvements. At the back-end-of-line, where ICs are interfaced, and elements like display panels are structured, this drive can be felt as well. The development here goes towards the processing of substrates of increasing size surpassing the wafer-level to increase throughput, thus becoming large-field photolithography. The current resolution requirements here are typically in the 1 &mto 2 &mfor minimumfeature size. An investigation in phase-space identifies two possibilities for advanced photolithographic systems relying on different exposure mechanics. We combine a novel semiconductor laser light source emitting in the deep ultra-violet at 193 nmwith a beam-shaping system to enable proximity printing with sub-2 &mresolution with a proximity gap of 20 &m. The integration of this approach with optical exposure gapmetrology and a high-precision substrate positioning stage demonstrates the possibility for large-field exposure. In a second approach we realize a highly integrated micro-optical multi-aperture projection lens to pattern an exposure field of 100mmby 100mm. A mechanical scanner to mount the projection lens, required to achieve uniform exposure of the entire field, is realized as well. Projection lens and scanner are integrated with a high-precision substrate positioning stage and a mask aligner illumination system to demonstrate the ability for large-field photolithographic printing. The optical design is validated by demonstrating printedminimumfeature sizes of 2 &m. Practical shortcomings of the system are investigated and strategies to overcome these issues are presented and discussed.

  • Files
  • Details
  • Metrics
Type
doctoral thesis
DOI
10.5075/epfl-thesis-9809
Author(s)
Kirner, Raoul  
Advisors
Scharf, Toralf  
Jury

Prof. Christophe Moser (président) ; Dr Toralf Scharf (directeur de thèse) ; Prof. Niels Quack, Prof. Alois Herkommer, Prof. Uwe Detlef Zeitner (rapporteurs)

Date Issued

2019

Publisher

EPFL

Publisher place

Lausanne

Public defense year

2019-12-13

Thesis number

9809

Total of pages

179

Subjects

Photolithography

•

large-field exposure

•

phase-space

•

proximity printing

•

DUV laser

•

beam-shaping

•

coherent simulation

•

microlens projection lithography

•

wafer-level packaging

•

microlens array

EPFL units
NAM  
Faculty
STI  
School
IMT  
Doctoral School
EDPO  
Available on Infoscience
December 9, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/163869
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés