Applied Physics A

, Volume 101, Issue 2, pp 243–248

Fabrication of micro/nano crystalline ITO structures by femtosecond laser pulses

  • C. W. Cheng
  • W. C. Shen
  • C. Y. Lin
  • Y. J. Lee
  • J. S. Chen
Article

DOI: 10.1007/s00339-010-5810-1

Cite this article as:
Cheng, C.W., Shen, W.C., Lin, C.Y. et al. Appl. Phys. A (2010) 101: 243. doi:10.1007/s00339-010-5810-1

Abstract

A method is proposed for the fabrication of micro/nano crystalline indium tin oxide (c-ITO) structures using a Ti:Sapphire laser with a repetition rate of 1 kHz and a wavelength of 800 nm. In the proposed approach, an amorphous ITO (a-ITO) thin film is transformed into a c-ITO micro/nano structure over a predetermined area via laser beam irradiation, and the residual a-ITO thin film is then removed using an etchant solution. The fabricated c-ITO structures are observed using scanning electron microscopy (SEM) and cross-sectional transmission electron microscopy (TEM). The observation results show that the use of a low repetition rate laser induces a high thermal cycling effect within the ITO film and therefore prompts the formation of micro-cracks in the c-ITO structure. In addition, it is shown that as the laser power approaches the ablation threshold of the a-ITO thin film, nanogratings and disordered nanostructures are formed along the center lines of the c-ITO patterns formed using linearly polarized and circularly polarized laser beam irradiation, respectively. The nanogratings are found to have a period of approximately 200 nm (i.e. one-quarter of the irradiation wavelength), while the nanostructures have an average diameter of approximately 100–160 nm.

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • C. W. Cheng
    • 1
  • W. C. Shen
    • 1
  • C. Y. Lin
    • 1
  • Y. J. Lee
    • 2
  • J. S. Chen
    • 2
  1. 1.ITRI SouthIndustrial Technology Research InstituteTaiwanROC
  2. 2.Department of Mechanical EngineeringNational Chung Cheng UniversityTaiwanROC