Characterization of stable and transient cavitation in megasonically irradiated aqueous solutions

Rajesh Balachandran, Mingrui Zhao, Petrie Yam, Claudio Zanelli, Manish K Keswani

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Megasonic cleaning is routinely used for removal of particulate contaminants from various surfaces in integrated circuit industry. One of the drawbacks of megasonic cleaning is that although it can achieve good particle removal efficiencies at high power densities, it also causes feature damage. The current paradigm is that damage is primarily caused by transient cavitation whereas cleaning is affected by streaming and stable cavitation. In order to develop a damage-free and effective megasonic cleaning process, it is essential to understand the acoustic bubble behavior and identify conditions that generate significant stable cavitation without any transient cavitation. In the current work, microelectrode based chronoamperometry, pressure measurements using a hydrophone and fluorescence spectroscopy studies were conducted under different acoustic frequencies (1-3 MHz) and power densities (2-8 W/cm2) to fundamentally investigate the type of cavitation produced under these conditions and also establish a correlation to the generation of hydroxyl radicals for characterization of transient cavitation.

Original languageEnglish (US)
Pages (from-to)45-50
Number of pages6
JournalMicroelectronic Engineering
Volume133
DOIs
StatePublished - Feb 5 2015

Fingerprint

cavitation flow
Cavitation
aqueous solutions
cleaning
Cleaning
damage
radiant flux density
Acoustics
Hydrophones
Chronoamperometry
acoustic frequencies
Microelectrodes
hydrophones
Fluorescence spectroscopy
hydroxyl radicals
pressure measurement
Pressure measurement
Hydroxyl Radical
particulates
integrated circuits

Keywords

  • Hydrophone
  • Hydroxyl radical
  • Megasonic cleaning
  • Stable cavitation
  • Transient cavitation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

Cite this

Characterization of stable and transient cavitation in megasonically irradiated aqueous solutions. / Balachandran, Rajesh; Zhao, Mingrui; Yam, Petrie; Zanelli, Claudio; Keswani, Manish K.

In: Microelectronic Engineering, Vol. 133, 05.02.2015, p. 45-50.

Research output: Contribution to journalArticle

Balachandran, Rajesh ; Zhao, Mingrui ; Yam, Petrie ; Zanelli, Claudio ; Keswani, Manish K. / Characterization of stable and transient cavitation in megasonically irradiated aqueous solutions. In: Microelectronic Engineering. 2015 ; Vol. 133. pp. 45-50.
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