Patent ID: 8529985

Claim:
A method for forming a vapor for thin film deposition on a substrate, the method comprising forming a droplet aerosol by an apparatus comprising a tubular housing being provided with sufficient insulation to produce a temperature difference of at least 30° C. between a heated vaporization chamber and a capillary tube inlet of the tubular housing for receiving precursor chemical, the tubular housing having a wall thickness and length to achieve the 30° C. temperature difference (ΔT) according to the following relationship: Δ ⁢ ⁢ T = QL k ⁢ ⁢ π ⁢ ⁢ Dt where Q=Rate of heat transfer from one end of the tubular housing to another end k=Thermal conductivity of the tubular housing D=Diameter of the tubular housing t=Thickness of the tubular housing L=Length of the tubular housing; and passing said droplet aerosol into the heated vaporization chamber to form vapor.