Principles and applications of trans-wafer processing using a 2-μm thulium fiber laser

  • Ilya Mingareev
  • Nils Gehlich
  • Tobias Bonhoff
  • Ali Abdulfattah
  • Alex M. Sincore
  • Pankaj Kadwani
  • Lawrence Shah
  • Martin Richardson
ORIGINAL ARTICLE

Abstract

A self-developed nanosecond-pulsed thulium fiber laser operating at the wavelength λ = 2 μm was used to selectively modify the front and the back surfaces of various uncoated and metal-coated silicon and gallium arsenide wafers utilizing transparency of semiconductors at this wavelength. This novel processing regime was studied in terms of the process parameter variations, i.e., pulse energy and pulse duration, and the corresponding modification fluence thresholds were determined. The results revealed nearly debris-free back surface processing of wafers, in which modifications could be induced without affecting the front surfaces. The back surface modification threshold of Si was significantly higher than at the front surface due to non-linear absorption and aberration effects observed in experiments. A qualitative study of the underlying physical mechanisms responsible for material modification was performed, including basic analytical modeling and z-scan measurements. Multi-photon absorption, surface-enhanced absorption at nano- and microscopic defect sites, and damage accumulation effects are considered the main physical mechanisms accountable for consistent surface modifications. Applications of trans-wafer processing in removal of thin single- and multi-material layers from the back surface of Si wafers, both in single tracks and large areas, are presented.

Keywords

Infrared lasers Laser materials processing Semiconductors 

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Copyright information

© Springer-Verlag London 2015

Authors and Affiliations

  • Ilya Mingareev
    • 1
    • 2
  • Nils Gehlich
    • 1
    • 2
  • Tobias Bonhoff
    • 1
    • 2
  • Ali Abdulfattah
    • 1
  • Alex M. Sincore
    • 1
  • Pankaj Kadwani
    • 1
  • Lawrence Shah
    • 1
  • Martin Richardson
    • 1
  1. 1.Townes Laser Institute, CREOL, College of Optics and PhotonicsUniversity of Central FloridaOrlandoUSA
  2. 2.Fraunhofer Institute for Laser TechnologyAachenGermany

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