Thin metal film (sputtering?) on dielectric with 7 contacts - Page 1
Forum section: electronics / projects

author: ddavidebor
author_rank: Super Contributor
timestamp: September 05, 2019, 02:03:44 am
content: 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 glassmake 7 electric contacts on such material and connect it with bonding wires to a PCB like if it were a bare dieUsage is an apparatus to study the hall effects on metals

author: Someone
author_rank: Super Contributor
timestamp: September 05, 2019, 08:00:43 am
content: Start somewhere like here:http://www.nano.cnr.it

author: ddavidebor
author_rank: Super Contributor
timestamp: September 05, 2019, 03:16:07 pm
content: I actually have pretty good contacts inside that organization but getting them to do commercial work is pretty much impossible

author: Someone
author_rank: Super Contributor
timestamp: September 05, 2019, 11:08:06 pm
content: Its a small community, they should know of other groups and facilities with similar capabilities.

author: rfeecs
author_rank: Frequent Contributor
timestamp: September 05, 2019, 11:16:28 pm
content: Just search for thin film circuits. An example:https://www.thinfilm.com/

author: patrick1
author_rank: Contributor
timestamp: September 07, 2019, 08:03:48 am
content: sounds like making uber capacitors, = mabee just glue down your copper contacts, and spray metalic paint over them

author: branadic
author_rank: Super Contributor
timestamp: September 07, 2019, 08:29:38 am
content: 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?-branadic-

author: ddavidebor
author_rank: Super Contributor
timestamp: September 07, 2019, 03:58:38 pm
content: 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,

author: KaneTW
author_rank: Frequent Contributor
timestamp: September 07, 2019, 04:26:15 pm
content: 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 athttps://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.