If what you are searching for is what was described above, it is commonly referred to as the "Back Sheet".
NiHaoMike: some back sheets are black. The last Canadian Solar modules I ordered are black frame, monocrystalline, with black back sheet. (I'm doing a ground mount with those and wanted to blend into the scenery). I've seen the encapsulant (the clear goo around the cells) change color over time, and turn yellow on panels with white back sheets.
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