Patent ID: 7897966

Claim:
A flat substrate member with an extent of at least 2500 cm 2 comprising: a substrate with a first surface and a second surface; and a layer stack supported upon said first surface of said substrate, wherein said layer stack comprises a first dielectric layer deposited onto said first surface of said substrate; a microcrystalline silicon layer deposited onto said first dielectric layer and separated from said substrate by said first dielectric layer; a second dielectric layer separated from said first dielectric by said microcrystalline silicon layer; and a subsequent silicon-containing layer deposited onto said second dielectric layer, wherein at least one of said microcrystalline silicon layer, said first dielectric layer, said second dielectric layer, and said subsequent silicon-containing layer comprise a thickness uniformity adjacent to an edge of said substrate that deviates from average thickness by at most 7% of said average thickness.