Patent ID: 7963735

Claim:
A loading/unloading method of a semiconductor substrate using an end-effector of a robot arm from a batch type boat for treating the semiconductor substrate in bulk, said batch type boat having supporting rods protruding from a boat frame, said method comprising the steps of: supporting holder rings on the supporting rods; causing the end-effector to support the semiconductor substrate, said end-effector comprising a groove; inserting the end-effector into the batch type boat, wherein at least one of the supporting rods is temporarily inserted into the groove of the end-effector during insertion of the end-effector and the semiconductor substrate into the batch type boat, and wherein in order to allow the occupying space of the at least one supporting rod to be temporarily inserted into the groove of the end-effector, a pair of the supporting rods is penetrated through an inner circumference of the holder ring at a lower portion thereof in the direction of a working path of the end-effector in such a manner that the holder ring is supported on the supporting rods by four spots and to thereby maintain a space between a lower portion of the semiconductor substrate and an adjacent semiconductor substrate; and loading/unloading the plurality of semiconductor substrates through insertion and selective supporting and removal of the plurality of semiconductor substrates from the end-effector, wherein the loading/unloading of the semiconductor substrate is performed by means of the end-effector of a bottom-lift type having a holder ring receiving groove for receiving the holder ring.