How can I deposit metallic electrodes on a temperature-sensitive wafer?

Question

How can I deposit metallic contacts on a wafer in a process that won't heat the wafer above 80C? The size of the electrodes should be around 1mm².

The wafer could be glass or silicon, coated with a sensitive organic/polymeric film, functioning as a dielectric layer.

@BrianDrummond silver paint is toluene based, which dissolves the present film, and water-based silver ink oxidises too fast. — Sparkler, Oct 01 '15 at 22:21
Perhaps electrolysis if you first doped the area with a conductive material. — BenG, Oct 01 '15 at 22:22
@BrandenBoucher Wouldn't the wafer become hot due to the plasma? — Sparkler, Oct 02 '15 at 02:09
Are you interested in the behavior of the film, or is there something in the wafer you're testing, and the film is a protective coating? — WhatRoughBeast, Oct 02 '15 at 02:15
@WhatRoughBeast the film has a function and the electrode needs to be deposited on the film. — Sparkler, Oct 02 '15 at 02:17
Turn the problem inside out. Deposit the contacts on the wafer, then lay down the film, then dissolve holes in the film to allow connection with the contacts. Make the connection holes smaller than the contacts, so there is an overlap of film over outer portions of the contacts. — WhatRoughBeast, Oct 02 '15 at 02:27
@WhatRoughBeast sorry I didnt mention before: the film is a dielectric layer separating between a top electrode and a bottom electrode. question updated. — Sparkler, Oct 02 '15 at 02:31
So the film is non-conductive? In that case just use any epoxy that won't dissolve the film. — WhatRoughBeast, Oct 02 '15 at 02:34

score 1 · Answer 1 · answered Oct 02 '15 at 02:02

1

I have not used it personally but I know you can get conductive epoxy, you could probably use this to bond wires on without heat.

answered Oct 02 '15 at 02:02

Hugoagogo

1 Answers1