0.33 NA EUV scanners are being used for High Volume Manufacturing. In this paper we will give an update on the performance improvements of the NXE:3400 systems related to the lithographic performance, productivity and uptime.
Finally we look at future system improvements to meet requirements for the 3 nm node and beyond.
In 2019 we have seen the first 7 nm logic devices, manufactured on ASML NXE:3400 scanners, hitting the market. In this paper we will give an update on the performance improvements to further optimize these systems for High Volume Manufacturing (HVM), related to the lithographic performance, productivity and uptime.
We will also demonstrate that for the 5 nm logic node and 10nm-class DRAM, excellent overlay, focus, and critical dimension (CD) control have been realized. In combination with intrinsic tool stability and holistic control schemes, including (resist and tool) performance improvements addressing stochastics issues, this provides the required performance for HVM for these nodes.
Finally we will discuss the ASML roadmap for meeting the requirements for the 3 nm node and beyond.
Advanced Process Control (APC) on overlay is in use for high-volume production fabs with enough data available to statistically filter out noise contributions. In a foundry that is characterized by multiple products, each with a low production volume, very limited data is available per product. With the proposed advanced process control system we want to solve the issues related to this low amount of data by using data from lots that have a different history, e.g. lots that are exposed on other machines or lots from other products. To be able to do this production data is first corrected for machine contributions by use of monitor data for each machine. The resulting estimated process induced errors are maintained for all products and all layers in a database with reference to used machines, layers, product type and process family. The process induced errors for each lot are selected from the database by sharing available data that is expected to behave most similar. The proposed advanced process control system is partially implemented in production for a couple of layers. Simulations are run on more layers to test the data sharing concept. The simulation
results are in reasonable agreement with actual product measurements and predict that the advanced process control system performs similar for lots for which the proposed data sharing concept is used as for lots for which the identical context is available.
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