Patent ID: 7819079

Claim:
A cluster tool for processing a substrate, comprising: a first processing rack comprising: a first group of two or more process chambers that are stacked in a vertical direction, each process chamber in the first group having a first width aligned along a first direction; and a second group of two or more process chambers that are stacked in the vertical direction, each process chamber in the second group having a second width aligned along the first direction; a first robot assembly translating in a direction parallel to the first direction and positioning a substrate in each of the process chambers in the first and second groups in the first processing rack; a second processing rack comprising: a third group of two or more process chambers that are stacked in the vertical direction, each process chamber in the third group having a third width aligned along the first direction; and a fourth group of two or more process chambers that are stacked in the vertical direction, each process chamber in the fourth group having a fourth width aligned along the first direction, wherein the fourth width is generally a multiple of the third width wherein the third width is between about 0.4 meters and about 2 meters; and a second robot assembly translating in a direction parallel to the first direction and positioning a substrate in each of the process chambers in the third and forth groups in the second processing rack.