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PHI VersaProbe Operations

Scanning xps system

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PHI VersaProbe Scanning XPS System
I.
Overview
The PHI VersaProbe operates with two essential software programs:
Summitt
and
Vacuum
reduction.
PHI Summitt
controls the movement of the sample stage, the analysis setup and
acquisition, and the control of the ion gun and neutralizer gun.
Vacuum Watcher
is a separate program that interacts with
used to load and transfer samples and differentially pump the ion gun for
sputtering.
Summitt
and
Watcher
not close these programs without specific instructions from a lab supervisor.
• If
Summitt
persists after restart, contact a lab supervisor.
• Make sure
opening. Two open versions will cause problems.
• Never close
• If instructed to restart the computer, open
Summitt.
II.
Features
The VersaProbe XPS is capable of x-ray beam spot sizes from 10um-200um and
a High Power setting with a beam spot of roughly 1400x300um.
Secondary electron images (SXI) can be acquired to locate specific features to
be analyzed.
Computer controlled X, Y, Z, Tilt and Rotate stage control.
Auto Z alignment for optimization of x-ray impact and electron extraction.
Angle-resolved measurements can be done to analyze ultra thin films (with 1"
holder only).
Sputtering can be done to analyze thicker films or remove surface contamination.
System has both Ar+ and C60 sputter guns.
Dual beam (electrons and ions) for charge neutralization of insulating samples.
 
Watcher.
A third program, MultiPak, handles data
should always be open (running) on the instrument. Do
crashes, it can be closed and reopened. If problem
Summitt
is not already open and minimized before
Watcher.
It remains open even if
PHI
PHI Summitt
and is
Summitt
is restarted.
Watcher
first, then
1  

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Summary of Contents for PHI VersaProbe

  • Page 1 Summitt. Features The VersaProbe XPS is capable of x-ray beam spot sizes from 10um-200um and a High Power setting with a beam spot of roughly 1400x300um. Secondary electron images (SXI) can be acquired to locate specific features to be analyzed.
  • Page 2 ~10 Pa and then read “0”. While waiting for intro chamber to reach desired vacuum level: • Enable the PHI in Badger. (Will allow use of optical microscope and CCD camera on sample.) • Set up file for saved data.
  • Page 3 • When stage has stopped moving, follow instructions in “Intro” dialog box (see next step below). FIG 1: Vacuum Watcher—Intro Procedure FIG 2: Summit “Image” Window, Stage Tab—Intro Procedure   3  ...
  • Page 4 Watcher -> Push Transfer Sample • A “Task Message” window will open. Press Yes to confirm sample transfer. • Gate valve (V1) will open. Wait until white line has moved to “open” position on gate valve to confirm before moving sample. •...
  • Page 5 AutoZ Alignment (Figure 3). 1. Manually raise stage until samples are focused in CCD image. Height for a bare holder is 17mm. a. Raise stage to Z= 17- sample thickness (i.e. 16.5mm for typical wafer). Summitt -> In “Image” window, “Stage” tab, type new value into Z(mm).
  • Page 6 • Pass Energy: 23.5eV • Range: varies by element, can push Test Acquire to ensure peak is within region. • Energy Step: 0.1eV • Time/Step: 50ms • Repeats: Add repeats to regions that need better statistics. c. For faster option, can choose Unscan at bottom of Summitt->...
  • Page 7 For sputtering, choose desired sputter file. Chart taped to PHI console explains choices. c. Push Standby (will turn on power to sputter gun). d. A dialogue box will open reminding you to push Diff vlv Open. OK. e. On Pfeiffer RVG050 (FIG 7) box near computer monitor, toggle...
  • Page 8 3. Charge Neutralization Summitt-> “Image” window (RHS), “Neutralizer” tab (FIG 8). b. Push Standby (will turn on power to electron flood gun). Summitt-> “Acquisition Settings” window (LHS). Under “Neutralize,” Press ON. Neutralization will begin when spectrum is acquired. d. If need to do AutoZ, check the Neutralize and Ion Gun Neutralize boxes in SXI/AutoZ tab (FIG 3).
  • Page 9 • Interval Time (min)= sputter increments, in units of .5min. • Delayed Acq. Time (sec) = Delay before acquisition to allow count rate to stabilize. 3s is typical. • Num(Presputter) = How many scans to take before 1 sputter. 1 is typical. o Now, number of cycles is determined by sputter settings.
  • Page 10 f. If used neutralizer during AutoZ, go to “SXI/AutoZ” tab and uncheck “Neutralizer” and “Ion Gun Neut.” Watcher -> Press Pump Intro so V4 closes and turbo again pumps the intro chamber. VIII. Sample Extraction (See Figures 10-11). Summitt-> Image window-> Press Extract. Sample stage will lower, return to original X, Y and R settings, and then rise to a high Z position.
  • Page 11 FIG 11: Vacuum Watcher—Extract procedure   11  ...