Patent ID: 11889740
Assignee: APPLIED MATERIALS, INC.
Field: Surface technology, coating (Chemistry)
Classification: CPC H  B  C | IPC B  H

Claim 0:
1. An organic light-emitting diode (OLED) deposition system comprising:
a workpiece transport system configured to position a workpiece within the deposition system under vacuum conditions;
two or more deposition chambers, each deposition chamber configured to deposit respective layers of organic material onto the workpiece, wherein the two or more deposition chambers are coupled such that the vacuum conditions are maintained around the workpiece while the workpiece is transferred between a first deposition chamber and a second deposition chamber of the two or more deposition chambers by the workpiece transport system, wherein the first deposition chamber is configured to deposit a first layer in a device region and in a first test region separate from the device region, and wherein the second deposition chamber is configured to deposit a second layer in the device region over the first layer and in a second test region separate from the device region and the first test region and that does not overlie the first layer;
a transfer chamber interconnected to the two or more deposition chambers and configured to receive the workpiece from the two or more deposition chambers by the workpiece transport system while maintaining the vacuum conditions and retaining the workpiece within the transfer chamber;
a metrology system having (i) one or more sensors positioned to perform thickness measurements of the workpiece within the transfer chamber, (ii) an excitation light source for inducing photoluminescence in the first and second layers, thereby creating photoluminescence intensity output for each of the first and second layers, and (iii) a power meter for measuring the photoluminescence intensity output for each of the first and second layers; and
a control system to control a sequential deposition of the respective layers of organic material onto the workpiece by the two or more deposition chambers to form an organic light-emitting diode layer stack, the control system configured to
cause the first deposition chamber of the two or more deposition chambers to deposit the first layer of a first organic material onto the workpiece in the device region and the first test region,
cause the workpiece transport system to transfer the workpiece from the first deposition chamber to the second deposition chamber,
cause the second deposition chamber to deposit the second layer of a second organic material onto the workpiece in the device region to build at least a portion of the organic light-emitting diode layer stack and in the second test region,
cause the workpiece transport system to transfer the workpiece from the second deposition chamber to the transfer chamber,
receive from the metrology system a first plurality of measurements of the first layer in the first test region on the workpiece in the transfer chamber and a second plurality of measurements of the second layer in the second test region on the workpiece, wherein the first and second pluralities of measurements each comprise thickness measurements and photoluminescence intensity output measurements, and
determine a first doping concentration measurement of the first layer from thickness measurements and photoluminescence intensity output measurements of the first plurality of measurements and a second doping concentration measurement of the second layer from thickness measurements and photoluminescence intensity output measurements of the second plurality of measurements.