Soitec updated its Imager SOI product line page. The company supplies both standard and customer-specific structures requiring over 1.5µm top silicon. For silicon films thicker than 1.5µm, an additional epi growth is needed. Both 200mm and 300mm wafers are available for BSI imagers (I'd guess 200mm is supplied to TowerJazz and 300mm - to ST). The buried oxide layer thickness is in 0.145µm to 0.5µm range.
