ASML Stepper 3 Error Recovery, Troubleshooting and Calibration

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Revision as of 20:00, 30 May 2020 by John d (talk | contribs) (→‎IQC (Image Quality Control) Calibration Check: added screenshot of IQC results screen)
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Common Warnings

The following messages in the Warnings window are normal and do not require any action

  • Machine is Idle: Light Source Switched Off
  • Empty Input Carrier
    • In a high-volume foundry, this is an "Operator Error", but in the NanoFab.
  • Incoming Air Temp. Out of Range - ignore this.
  • Laser gas refill needed soon or Laser Gas Injection Required:
    • BEFORE your exposure, please run the "Laser Refill" procedure below, or you risk the system aborting during your exposure!

Wafer Recovery

See the Wafer Recovery page for procedure on how to recover from an error and get your wafers back.

Error Log full

Log windows shows <<Log File is Full>> and no further messages are appended.

  1. Close logging window that says "log file full"
  2. Right-Click on Desktop, and in the resulting menu:
  3. right-click "Local", then
  4. Select (left-click) on the "Logging" command. A new Logging window should open in the proper location.

Wafer Handler Issues during Batch operation

  1. Make sure no Batches are Running or Waiting! Abort the Batch or Stop the Queue.
    1. Never exit the Task Streaming screen while Batches are incomplete/running, you will enter software limbo on infinite loop drive, requiring a software restart.
  2. Lift black cover behind keyboard
  3. Press AWH button for 1 sec and release (resets Wafer Handler)
  4. Wait until wafer handler “system booting” message is done and warning window in bottom left of main computer console has disappeared. Log window should say it booted succesfully. Takes a few minutes.
  5. (DO NOT do FAST STARTUP from error message, go to main menu!)
  6. Exit to main menu
  7. Go to Start/Stop
  8. Fast Startup
  9. Start - will reinitialize the wafer handler system
  10. Once complete, back to main menu
  11. If wafers in machine, go to material handler (Mat Hdl). 
    1. Go to Remove Wafers menu and Collect Wafers
    2. Back to main menu when finished.
  12. If system says wafer is missing, contact engineer

IQC (Image Quality Control) Calibration Check

Use this procedure to check the system's focus calibration. Important before running <250nm feature litho jobs, including focus-exposure matrices (FEM's). It is common to add IQC verification as a step in your traveler before sub 250nm lithography steps.

  1. Main Menu > Test Manager > Run Tests > Metrology Verification > Image Quality Control
  2. Accept (Upper Button)
  3. Perform Measurement
  4. Choose System Correction
    1. # Cycles = 1
    2. # Measurements = 3
    3. # Corrections = 1
    4. M "Measure" mode only (does Not update internal lookup tables)
    5. (UCSB numbers for test 1  3  1  M)
  5. Accept to run the test
    1. If [Focus | Mean Correction] < 50nm, system OK, note number in log book
    2. If [Focus | Mean Correction] > 50nm, run test again, if number keeps dropping, keep running until number stable
    3. If [Focus | Mean Correction] is still > 50nm, discuss with engineer 
  6. Record the [Focus | Mean Correction] values for each run in the logbook please! This helps us determine whether there is a problem and how to remedy.
  7. Screenshot of IQC results screen.
    Results of Image Quality Control screen, showing the “Mean Focus Correction” value to record

Laser Refill (or laser calling for gas injection)

  1. Main Menu > Test Manager
  2. Open Cmd Handler (Cmd Hdl) (Top Menu)
    1. Illumination and Projection > Illumination
      1. Use Laser Start if laser asking for gas injection, otherwise do New Laser Fill

Failed Alignment Marks - Choosing new alignment marks for Pre-Alignment

If your job aborted with "Alignment failure" on the E- or P-Chuck, because your alignment marks are damaged, this is how to edit your job to use different alignment marks.

  1. Edit your job with Modify Job
  2. Go to Layer Layout > Process Data
  3. Use Layer: (Prev) / (Next) to select the layer you need to change alignment marks for
  4. Under  Prealignment Mode: Selection: Mark 1___ & Mark 2___ choose the alignment marks to align to, and use a microscope to make sure these alignment marks are (a) present on your wafer and (b) look ok with no defects.
    1. The wafer schematic shows which alignment marks you are choosing.
    2. The alignment marks, defined on a previous layer (usually combined with the first litho), are programmed/named in: <to be added: where in the program the AlMks are defined>
  5. Your "Fine" alignment marks will probably also fail if they're set to use the same marks! Fix this by editing your Wafer Layout > Alignment Strategy, and select different alignment marks or set some "backup" marks. Make sure your Layer Layout > Strategy Selection is using this new/updated strategy.
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