Patent ID: 8642125

Claim:
A method for depositing a material on a substrate, comprising: introducing the material as a powder and a carrier gas into a first chamber, the first chamber comprising one or more first chamber walls which are permeable to a vapor and the carrier gas but impermeable to the solid material; heating a heating element associated with the first chamber to a temperature sufficient to vaporize at least a portion of the powder into a vapor; directing the vapor through the one or more permeable first chamber walls into a second chamber positioned outside the first chamber that provides a material flow sufficiently indirect to mix the vapor and the carrier gas into a substantially uniform vapor/carrier gas composition; directing the vapor carrier gas composition into a first passageway formed in a block; directing the vapor/carrier gas composition towards a portion of an external surface of the second chamber to disperse the vapor/carrier gas composition and further increase its uniformity; and directing the substantially uniform vapor/carrier gas composition towards a surface of a substrate, wherein the block has a first and a second extension that form a second passageway having a first branch between the first block extension and the external surface of the second chamber and a second branch between the second block extension and the external surface of the second chamber and the vapor/carrier gas composition is directed through the second passageway before being directed towards the surface of the substrate.