Patent ID: 7077912

Claim:
A semiconductor manufacturing system capable of loading a plurality of semiconductor wafers into a vertical reaction tube, and performing a thermal process, the system comprising: a first wafer loading boat which is mounted in the reaction tube and includes a plurality of holder supporters that support a wafer holder in a shape of a board, the wafer holder being loaded vertically at a predetermined interval and on which the semiconductor wafer is rested on; a second wafer loading boat which is inside the first wafer loading boat and has wafer supporters that are located under the semiconductor wafer to support the semiconductor wafers; a plate cap which supports the first wafer loading boat and the second wafer loading boat in their lower portions; a door plate which supports the plate cap in the lower portion of the plate cap; a lifting system which moves at least one of the first wafer loading boat and the second wafer loading boat vertically and separates the semiconductor wafer, which is loaded on the wafer holder, from the wafer holder at a predetermined height during wafer load and unload cycles; wherein the wafer holder comprises: a main board which is a circular board and opening portions which are made at the rim of the circular board to allow the second wafer loading boat and the wafer supporters to vertically move there through freely.