BST sensors were generally OK, it was a lump of ceramic bonded to a substrate so didn't get that hot. i suppose you could melt the chopper if you tried hard enough though.
In principle all A-Si are vulnerable as it is a thin wafer of material up in a vacuum, so the sun can get that quite hot and must change pixels permanently. Nothing a factory recalibration won't fix though.
All sensors have a number of anti-reflection coatings on both windows and top layers, so together with any tweaks to the material itself done right that must protect A-Si enough to avoid permanent damage. It is unlikely to be done as an additional film.
All cameras will show some minutes or more of 'burn in' from a very hot object as the sensor and underlying circuitry got hot and need to cool back down.
Someone else can talk for V-Ox, not used enough of them, but on the face of it should not be a lot better than A-Si but may be protected the same way too. You can burn a VOx camera temporarily with block at 700°C
Bill
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