Patent ID: 6214692
Filing Date: 2001-04-10
Classification: B62D,H01L,Y10T

Abstract:
A method for the aligned joining of disk-shaped semiconductor substrates, so-called wafers, provided with alignment marks, which are held on substrate carriers, wherein the wafers are adjusted to a parallel position of their sides facing towards each other, are aligned according to alignment marks provided on these sides, and are then joined, where for detecting the alignment marks to be brought to coincidence there are used microscope units with coaxial lenses directed towards opposite sides, characterized in that the substrate carrier for the one semiconductor substrate is at least movable in a coordinate direction approximately parallel to the main plane of the semiconductor substrate from a processing station into a measuring station, and the other substrate carrier is movable in the three coordinate directions, is rotatable about an axis normal to the main plane of the semiconductor substrate carried by the same, and for wedge error compensation is adjusted in its tilted position with respect to the other substrate carrier, where via measuring and control means set positions of the substrate carriers are detected and reproduced, that in the measuring station the two lenses of the microscope units are mounted at a distance from each other and facing towards each other, so that the substrate carriers with the substrates can be introduced between the same, where these substrate carriers are moved into the measuring station one after the other, and upon introduction of the first substrate carrier, the microscope units with their corresponding lenses are adjusted to the alignment marks of the semiconductor substrate held at the first substrate carrier, this first substrate carrier is then moved back, and the second substrate carrier now introduced is adjusted to the other lenses of the microscope units, even if the microscope setting remains unchanged, for aligning the alignment marks of the semiconductor substrate carried by the same, and that finally the substrate carriers are joined with the aligned semiconductor substrates outside the measuring station.