Premium
Low‐energy Ar neutral beam etching method for x‐ray photoelectron spectroscopy
Author(s) -
Iijima Yoshitoki,
Yamada Takahisa,
Matsumoto Shigeo,
Hiraoka Kenzo
Publication year - 1994
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740211107
Subject(s) - x ray photoelectron spectroscopy , sputtering , ion beam , analytical chemistry (journal) , etching (microfabrication) , ion gun , atomic physics , auger electron spectroscopy , wafer , materials science , chemistry , ion , thin film , optoelectronics , layer (electronics) , nanotechnology , nuclear magnetic resonance , physics , organic chemistry , chromatography , nuclear physics
Abstract A simple Ar neutral beam gun capable of providing low‐energy Ar atoms has been developed for surface cleaning and depth profile analysis in x‐ray photoelectron spectroscopy, Auger electron spectroscopy, etc. Characterization of the Ar neutral beam gun is described. The effect of neutral beam bombardment was investigated for an Si(100) wafer and a polyethylene terephthalate (PET) film in order to reduce chemical damage by sputter etching in XPS. The neutral beam etching gun was composed of a Kaufman‐type ion source, a gas collision chamber and an electrostatic deflector. This gun can work also as an ion gun by a simple operation mode change. Neutral and ion beam fluxes were measured using an absorption current plate made of stainless steel. Experimental results showed that the probability of neutralization in a charge exchange chamber was ∼80% of the maximum between 1 x 10 −1 Pa and 2 x 10 −1 Pa, and the sputtering rate for SiO 2 at 600 eV was 14 nm min −1 , which is ∼30% lower than with a Kaufman‐type ion gun. The bombardment process for an Si wafer was essentially the same for the Ar ion beam and the Ar neutral beam. However, it was observed that radiation damage to the PET film surface etched by the neutral beam was remarkably diminished as compared with that by the ion etching method. This can be ascribed to the fact that the effect of electronic damage etching due to Ar 0 is less than that due to Ar + .