Patent ID: 6752874
Filing Date: 2004-06-22
Classification: C23C,C30B,H01L

Abstract:
An apparatus for a low-pressure chemical vapor deposition comprising:a growth chamber having a quartz tube of a heterostructure for maintaining a uniformity in a growth of an epitaxial layer under a high vacuum and minimizing a thermal transfer from a wafer; a wafer transferring chamber connected to a lower side of the growth chamber, said wafer transferring chamber having a perpendicular transfer device for vertically transferring the wafer on which the epitaxial layer grows; a buffer chamber equipped in a lower side of the wafer transferring chamber, for preventing a stress to a transfer gear caused by a pressure difference with the wafer transferring chamber in vertically transferring the wafer; and a loadlock chamber connected to one side of the wafer transferring chamber, for reducing a pollution from the outside in the growth of the epitaxial layer, horizontally transferring the wafer completed in the growth of the epitaxial layer, and discharging it to the outside, wherein said perpendicular transfer device within the wafer transferring chamber, comprises: an upper flange opened in a center thereof, for separating the growth chamber and the wafer transferring chamber during the growth of the epitaxial layer; a wafer carrier accepting numerous wafers and supporting the accepted wafers; a quartz bottom plate for supporting the wafer carrier; a wafer transfer die connected to the quartz bottom plate, for supporting the wafer carrier on which then wafers are accumulated, and vertically moving it; a lower flange stuck to the buffer chamber an opened in a center thereof; a primary convey die having a primary transfer gear and an outer bellows connected between one side of the upper flange and the buffer chamber, said outer bellows being for upwards moving the upper flange; and a secondary convey die which has a secondary transfer gear connected to the wafer transfer die and has an inner bellows connected between the upper flange and the secondary transfer gear so as to position the wafer carrier vertically transferred by the primary convey die at a uniform temperature region of the growth chamber, said inner bellows being moved upwards by a rotation of the secondary transfer gear.