| 摘要 |
A silicon structure is at least partially thermally isolated from a substrate (210) by a gap (232) formed in an insulation layer (230) disposed between the substrate (210) and a silicon layer (220) in which the silicon structure is formed. In embodiments, the substrate (210) is made of silicon and the silicon layer (220) is made of single crystal silicon. In embodiments, the gap (232) is formed such that a surface of the substrate (210) under the gap (232) is maintained substantially unetched. In other embodiments, the gap (232) is formed without affecting the surface of the substrate (210) underlying the gap (232). In particular, the gap (232) may be formed by removing a portion of the insulation layer (230) with an etch that does not affect the surface of the substrate (210) underlying the gap. In embodiments the etch is highly selective between the material of the insulation layer (230) and the material of the substrate (210). The etch selectivity may be about 20:1 or greater. <IMAGE> |
