I'm juggling a baby approaching lunch time at the moment, so I can't go into too much depth on this paper[0] I found 40 seconds ago, but the conclusion seems to think that solar panel EROIE in siwtzerland is somewhere between 7 and 10, which as a proxy for carbon intensity, /probably/ means it will actually result in net carbon reduction.
[0]https://www.sciencedirect.com/science/article/pii/S030142151...