Differences

This shows you the differences between two versions of the page.

--- wire_bonder [2025/04/17 12:41] – [Starting the bonding] wigbout
+++ wire_bonder [2025/04/17 12:56] (current) – [Available accesoiries and tools] wigbout
@@ Line 33: / Line 33: @@
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 \\
-A detailed view of the wirebonder wedge (to scale) is shown below.
+A detailed view of the wirebonder wedge is shown below.
 {{ :wirebonder_wedge.png?nolink&1000 |}}
@@ Line 59: / Line 59: @@
    * :?: **Bonds are weak, they break easily.** \\ You might be flattening the wire too much: decrease Force!
-   * :?: **Bonds are set, but when moving to the loop height, they still break.** \\ Lower the Loop Height to about the same height as the 1st Search Height. Upon setting the first bond, slowly increase the Loop Height. If the bond still breaks when you do this very carefully, you might want to perform a reverse stepback-manoeuvre to make sure that the tension is not on the bond, but in a kink in the wire. You can find out how to do this [[here]]. FIXME
+   * :?: **Bonds are set, but when moving to the loop height, they still break.** \\ Lower the Loop Height to about the same height as the 1st Search Height. Upon setting the first bond, slowly increase the Loop Height. If the bond still breaks when you do this very carefully, you might want to perform a reverse stepback-manoeuvre to make sure that the tension is not on the bond, but in a kink in the wire. You can find out how to do this [[wire_bonder#Making nice bow bonds|here]].
    * :?: **None of these work?** \\ If changing the Time and Force doesn't work, try changing the Power. If the Power > 2, and it still is not working, the problem lies in your sample, not the wire bonder. Make sure that the sample is mounted rigidly, so that no resonance effects occur. Make sure that the sample is flat, so that the foot of the wedge is optimally touching the sample surface.
@@ Line 84: / Line 84: @@
 ==== Checking system status and before starting ====
-__Check the wedge and wire:__\\
+=== Check the wedge and wire: ===
    * Check if the wedge is in the microscope's field of view at minimum magnification. Focus on the wedge tip.
-   * Check if a small tail of wire is visible. If not: [[feed manually]].((add internal link)) FIXME
+   * Check if a small tail of wire is visible. If not, [[wire_bonder#Feed small amount of wire|feed manually]].
    * Without touching the spool of the wire, check that the wire is not too tense. If the wire looks straight, carefully loosen the nut on the left. This makes sure that the spool can unwind.((If the wire is tense, and you are setting a bond, at some point, the clamp will open, and the wire will jump out of the needle. If you are lucky, it only jumps out of the small hole, but if you are unlucky, the wire jumps out of the needle completely, even unwinding at the spool. This typically means that we have to throw away several centimeters of wire.))
-__Check the ultrasound transfer:__\\
+=== Check the ultrasound transfer: ===
-   * Check if the wedge is installed correctly. With the test button on the left panel you can check if the wedge is installed properly in the US transducer. Push the button down, the 'U/S' LED should light up continuously. If bonding doesn't work make sure you check the US transducer again. If not: [[adjust the wedge height]]. FIXME
+   * Check if the wedge is installed correctly. With the test button on the left panel you can check if the wedge is installed properly in the US transducer. Push the button down, the 'U/S' LED should light up continuously. If bonding doesn't work make sure you check the US transducer again. If not, [[wire_bonder#How to adjust the wedge height|adjust the wedge height]].
-__Check wire bonder settings:__\\
+=== Check wire bonder settings: ===
    * Check if the clamp is closed.
    * Check if the 'Tear' knob is at 5.
@@ Line 121: / Line 121: @@
 ----
-==== Wedge Bonding ====
+{{ :wiki:wedge_bonding_cycle_in_semi-auto_mode_with_notes.jpg?nolink&600|}}
+==== Starting the Wedge Bonding ====
 Wedge bonding is a uni-directional process, starting the first bond at the front of the sample and making the second bond at the back of the sample (while sitting in front of the machine). When the wire is fed through the wedge and also through the hole at the backside of the wedge correctly (which requires some time or handyness), wedge bonding can start. First make sure that the surplus of wire within a reasonable amount or do a test bond first.
 \\
 === Semi-automatic bonding ===
-{{ :wiki:wedge_bonding_cycle_in_semi-auto_mode_with_notes.jpg?nolink&600|}}
    - //Press and hold// the left mouse button
@@ Line 136: / Line 137: @@
    - Depress the left mouse button to finish the second bond.
-=== Manual Z-control ===
+=== Finishing up and leaving the system ===
-Next to the semi-automatic bonding, it is also possible to control the wedge approach manually which can be convenient in some situations. To enable manual Z bonding set the 'semi-automatic/manual' switch at the right panel to manual (it is located at the rightmost side of the machine). Now you can use the lever at the left hand side of the machine to control the Z position of the wedge. This lever is //extremely sensitive// so take care when handling it.
-In manual mode the machine still uses the search height settings to control the bonding process, so make sure these are set correctly (this can only be done properly in semi-auto mode).
-   - //__Slowly__// lower the wedge using the lever. The lever is //very// sensitive so take care.
-   - When close to the surface, fine position the wedge and then press the lever fully down to initiate the bonding process.
-   - After the first bond, the wedge will go up according to the position of the lever. It's maximum from the workpiece surface is defined by the loop height.
-   - Next position the wedge roughly over the second bond pad and again //slowly// lower the wedge by pushing down the lever. With the wedge close to the surface, fine position and make the second and final bond.
-   - Release the lever after the second bond has been made, and the wedge will return to reset position.
-\\
-===== Finishing up and leaving the system =====
 Always leave the system with the wire in the wedge, write the logbook, clean your workspace and turn of the goose neck lightguide if you used it.
@@ Line 153: / Line 143: @@
 ===== Common problems, tips and tricks =====
+=== Feed small amount of wire ===
-=== Feed small amount of wire===
   * Open clamp (flip switch on the right)
   * Move clamp lifter up (clamp lifter is on the left of the machine, close to the arm)
   * Close clamp
   * Move clamp lifter down
-  *
+If you can see that the wire is not going through the lower hole, but instead, is curling up, this could mean that the wedge is clogged. [[wire_bonder#How to clean the wedge|here you see how to fix that]].
 {{ :wiki:wirebond_bow.jpg?nolink&200|}}
 === Making nice bow bonds ===
 A nice bond needs to have a nice bow to avoid tension and stress. If a wire is connected straight between contact pads there will be tension on the bond pads.
@@ Line 171: / Line 163: @@
 On the left panel use the 'TEST' switch, the U/S LED between the 1st and 2nd should light up continuously.
 \\When loosening or tightening the screw of the wedge always make sure to use the correct height gauge! The height setting of the wedge is extremely sensitive.
+=== How to adjust the wedge height ===
+FIXME
 === How to change the wedge ===
-\\
+FIXME
 === How to clean the wedge ===
-min in the ultrasonic bath in ISO-Propanol
+If the wedge is clogged, you might want to clean it.
+Find a small petridish and fill it with a bit of isopropanol. Hold the petridish underneath the wedge without spilling, and use the Test-switch to turn ultrasounds on. This way, we basically ultrasonicate the wedge as if it were in a ultrasonicator. Sometimes, 10 seconds is enough to clean the wedge. If it is still clogged, you might want to remove it. Please contact a technician before you do that.
-===== Available accesoiries and tools =====
-  * Heater control to heat up the sample holder to facilitate Au wire bonding, this can be connected to the sample holder.
-  * Gooseneck bifurcated light guide on top of the bonder
-==== Wedges, capillaries & wire types ====
-The following wedges and capillaries are available:
-  * W Wedge - VU45A-W-2025-3/4-CM - used for 25μm Al wire
-  * Ti Wedge - VU45A-TIB-2025-3/4-CM - used for 25μm Au-wire
-  * Wedge - 4WNLO-2025-W5C-MOO - used for 25μm Al-/Pt-wire
-  * Capillary - 40472-0010-324 - used for 25μm Au-/Pt-wire