We should be well below the boiling point of water here, not anywhere near the melting point of metal. Any panel efficiency gain needs to be balanced against the energy required to cool the panels, the added mechanical complexity, the added material expense, and the added weight to orbit.

Ideally this is a static structure with an equilibrium temperature acceptable for the silicone to operate. If the required panel area is too hot on its own then a perpendicular cooling fin on the back that falls entirely within the shadow is added.