Flexible Electronics News

3M Introduces Backside Busbar Tape 4706

Product reduces need for silver paste, enabling lower costs

3M Renewable Energy debuted its latest innovative solution for the solar industry at Solar Power International, Oct. 21-24 in Chicago, IL. The new 3M Backside Busbar Tape 4706 allows manufacturers to eliminate silver-based backside busbars, enabling significant cost savings and protecting against the volatility of silver prices. In addition, this tape-based solution has the potential to improve absolute efficiency by approximately 0.2%.

3M Backside Busbar Tape 4706 is a copper foil tape coated with a high-performance heat-curable adhesive on one side. The tape can be bonded to aluminum pastes commonly used on the back surface of crystalline solar cells, and provide reliable, low-resistance electrical contact comparable to backside silver busbars. Preliminary tests have shown stable long-term electrical performance in damp heat and thermal cycling.

3M Backside Busbar Tape 4706 can be incorporated into existing manufacturing processes with an automated tape bonder. The fast-curing thermoset adhesive enables high productivity to match typical cell manufacturing processes.

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