Why not use solar panels to produce more solar panels, as they are produced? Nuclear has the same bootstrapping problem as any other power source, but it also

Why not use solar panels to produce more solar panels, as they are produced? Nuclear has the same bootstrapping problem as any other power source, but it also has the problem that we don't yet have a way to produce concrete without emissions, and our carbon-free steel methods are still in their infancy, and those are serious inputs to any new nuclear build.