Patent ID: 7572334

Claim:
An apparatus for forming a polycrystalline semiconductor sheet comprising: a deposition reactor comprising: a crucible having an outer wall, a base, and a lid that form a crucible processing region and a deposition port that is formed in the base, wherein the deposition port is in fluid communication with the crucible processing region; a heater in thermal communication with the crucible, wherein the heater is adapted to heat a feed material positioned in the crucible processing region to a liquid state; and a gas delivery port that is in fluid communication with a fluid source, the feed material positioned in the crucible processing region, and the deposition port; and a sheet support platen having a collection region that is positioned adjacent the base to receive feed material delivered through the deposition port from the crucible processing region, wherein a surface of the collection region of the sheet support platen comprises a material selected from the group consisting of silicon carbide, silicon nitride, boron nitride, graphite, and boron carbide.