Author Topic: Thin metal film (sputtering?) on dielectric with 7 contacts  (Read 992 times)

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Offline ddavideborTopic starter

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Thin metal film (sputtering?) on dielectric with 7 contacts
« on: September 05, 2019, 02:03:44 am »
Hello guys,

Do you know anyone who is able to do the following, or what techniques would be more appropriate?

Deposit a thin (max a few um) layer of metal on a stable dielectric such as ceramic or lot tempco glass
make 7 electric contacts on such material and connect it with bonding wires to a PCB like if it were a bare die

Usage is an apparatus to study the hall effects on metals
David - Professional Engineer - Medical Devices and Tablet Computers at Smartbox AT
Side businesses: Altium Industry Expert writer, http://fermium.ltd.uk (Scientific Equiment), http://chinesecleavers.co.uk (Cutlery),
 

Online Someone

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Re: Thin metal film (sputtering?) on dielectric with 7 contacts
« Reply #1 on: September 05, 2019, 08:00:43 am »
Start somewhere like here:
http://www.nano.cnr.it
 

Offline ddavideborTopic starter

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Re: Thin metal film (sputtering?) on dielectric with 7 contacts
« Reply #2 on: September 05, 2019, 03:16:07 pm »
I actually have pretty good contacts inside that organization but getting them to do commercial work is pretty much impossible
David - Professional Engineer - Medical Devices and Tablet Computers at Smartbox AT
Side businesses: Altium Industry Expert writer, http://fermium.ltd.uk (Scientific Equiment), http://chinesecleavers.co.uk (Cutlery),
 

Online Someone

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Re: Thin metal film (sputtering?) on dielectric with 7 contacts
« Reply #3 on: September 05, 2019, 11:08:06 pm »
Its a small community, they should know of other groups and facilities with similar capabilities.
 

Offline rfeecs

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Re: Thin metal film (sputtering?) on dielectric with 7 contacts
« Reply #4 on: September 05, 2019, 11:16:28 pm »
Just search for thin film circuits.  An example:
https://www.thinfilm.com/
 

Offline patrick1

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Re: Thin metal film (sputtering?) on dielectric with 7 contacts
« Reply #5 on: September 07, 2019, 08:03:48 am »
sounds like making uber capacitors, =  mabee just glue down your copper contacts, and spray metalic paint over them
 

Offline branadic

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Re: Thin metal film (sputtering?) on dielectric with 7 contacts
« Reply #6 on: September 07, 2019, 08:29:38 am »
Several µm are way to big for sputtering, as inner stress of the layer gets to big. Sputtering is more in the order of a few 100nm. If you need µm the way to go is thickfilm or a starting layer such as Cr/CrCu/Cu made with sputtering/PVD plus galvanic to increase layer thickness.
We have such processes at work including wire bonding, but I'd guess this is more for hobby?

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Offline ddavideborTopic starter

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Re: Thin metal film (sputtering?) on dielectric with 7 contacts
« Reply #7 on: September 07, 2019, 03:58:38 pm »
Did the math and I was wrong to suppose the um range, the optimal thickness is more around 10-100nm depending on the material.

No this is for work, I manufacture scientific equipment for universities. Not in a big-project-expensive-stuff way, just teaching equipment at quite low prices.
This would be for a metal hall effect demonstrator, a variation of the same product I design to measure the hall effect on germanium. However, it is half as interesting as in germanium and 100 times harder to measure,
David - Professional Engineer - Medical Devices and Tablet Computers at Smartbox AT
Side businesses: Altium Industry Expert writer, http://fermium.ltd.uk (Scientific Equiment), http://chinesecleavers.co.uk (Cutlery),
 

Offline KaneTW

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Re: Thin metal film (sputtering?) on dielectric with 7 contacts
« Reply #8 on: September 07, 2019, 04:26:15 pm »
You could buy a small sputter coater for something in the 4 digits range. Alternately, there's contractors that do it (e.g. https://www.europcoating.com/leistungen/schichtentwicklung/, but that one's in German), but those will generally be expensive-ish.

Thermal evaporation also works; there's a short overview at https://www.dentonvacuum.com/pvd-magnetron-sputtering-evaporation/.

I've worked on building a small sputter coater in the past but that sort of died while finding a suitable vacuum chamber. Most small coaters just use a glass tube, so I could try that.

E: for an actual technique, it depends a lot on the metal you're coating. For gold on glass, the process is generally a few nm of Ti or Cr on critically clean glass, followed by your desired amount of Au. The shape can be done via photoresist or shadow masking.
« Last Edit: September 07, 2019, 04:32:32 pm by KaneTW »
 


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