Patent ID: 7679166

Claim:
A semiconductor structure comprising: a substrate; a device above said substrate, wherein said device comprises a first material with a first reflectivity; and a trench isolation region above said substrate and positioned laterally adjacent to said device, wherein said trench isolation region comprises: a trench having sidewalls; a second material with a second reflectivity in said trench; and a third material with a third reflectivity in contact with said second material, wherein said third material does not extend laterally beyond said sidewalls, and wherein a location of said third material relative to said second material and a ratio of an amount of said third material to an amount of said second material are predetermined such that said third material balances differences between said first reflectivity of said first material of said device and said second reflectivity of said second material of said trench isolation region in order to make reflectance and absorption characteristics of said device and said trench isolation region approximately uniform.