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Had a chat to a work colleague today. He's the 3D printer expert tech. He's been experimenting with a 2 pot silicon rubber compound for which he makes the molds on the printer of course. (You ought to see his squid jig bodies in blue silicon ).
Anyway he is going to make me a thin, 1.5 mm flat sheet of silicon rubber. I can press that up against the back of the sensor with the copper finger. It's temp tolerant from 200C to -53c and it should make a better physical contact for the finger. Also keep the back dry, no air means no moisture although I'm looking into the argon bag solution as well.
In the meantime I've milled most of the copper island away to reduce weight and provide another TEC surface point.
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