Method of retaining a substrate during a substrate transferring process
A method and apparatus for processing substrates using a multi-chamber processing system, or cluster tool, that has an increased system throughput, increased system reliability, improved device yield performance, a more repeatable wafer processing history (or wafer history), and a reduced footprint. The various embodiments of the cluster tool may utilize two or more robots that are configured in a parallel processing configuration to transfer substrates between the various processing chambers retained in the processing racks so that a desired processing sequence can be performed on the substrates. In one aspect, the parallel processing configuration contains two or more robot assemblies that are adapted to move in a vertical and horizontal directions, to access the various processing chambers retained in generally adjacently positioned processing racks. Generally, the various embodiments described herein are advantageous since each row or group of substrate processing chambers are serviced by two or more robots to allow for increased throughput and increased system reliability. Also, the various embodiments described herein are generally configured to minimize and control the particles generated by the substrate transferring mechanisms, to prevent device yield and substrate scrap problems that can affect the cost of ownership of the cluster tool. The flexible and modular architecture allows the user to configure the number of processing chambers, processing racks, and processing robots required to meet the throughput needs of the user.
1. A method of transferring a substrate, comprising:
positioning a substrate on a substrate supporting device between a substrate contact member and a reaction member that are positioned on the substrate supporting device;
coupling an actuator having a connection member to the substrate contact member so that the connection member couples the actuator to the substrate contact member;
applying a holding force to the substrate using the actuator that urges the substrate contact member against the substrate and the substrate against the reaction member;
storing energy in a compliant member that is positioned between the substrate contact member and the connection member;
restraining the movement of the connection member after the holding force has been applied to minimize the amount of variation in the holding force during the process of transferring the substrate; and
sensing the movement of the substrate by sensing the movement of the substrate contact member due to the reduction in the stored energy in the compliant member.
2. The method of claim 1 , further comprising halting the movement of the substrate supporting device when the sensed movement of the substrate contact member exceeds a user defined value.
3. The method of claim 1 , further comprising transferring a substrate positioned on the substrate supporting device to a first array of processing chambers positioned along a first direction using a first robot assembly which is adapted to position the substrate supporting device at a desired position in the first direction and at a desired position in a second direction, wherein the second direction is generally orthogonal to the first direction.
4. The method of claim 3 , wherein the second direction is generally aligned in a vertical direction.