Determining lithographic matching performance
A method for determining lithographic matching performance includes obtaining first monitoring data from recurrent monitoring for stability control for an available EUV scanner. For a DUV scanner, second monitoring data is similarly obtained from recurrent monitoring for stability control. The EUV first monitoring data are in a first layout. The DUV second monitoring data are in a second layout. A cross-platform overlay matching performance between the first lithographic apparatus and the second lithographic apparatus is determined based on the first monitoring data and the second monitoring data. This is done by reconstructing the first and/or second monitoring data into a common layout to allow comparison of the first and second monitoring data.
1. A method of determining lithographic matching performance between lithographic apparatuses for semiconductor manufacturing, the method comprising:
obtaining first monitoring data in a first layout from recurrent monitoring for stability control of a first lithographic apparatus;
obtaining second monitoring data in a second layout from recurrent monitoring for stability control of a second lithographic apparatus; and
determining a lithographic matching performance between the first lithographic apparatus and the second lithographic apparatus based on the first monitoring data and the second monitoring data, wherein the determining comprises reconstructing, by a hardware computer system, the first and/or second monitoring data into a common spatial layout to allow comparison of the first and second monitoring data.
2. The method of claim 1 , wherein the reconstructing comprises fitting the respective first and/or second monitoring data to a model of a lithographic process of the respective first and/or second lithographic apparatus to predict reconstructed monitoring data in the common layout.
3. The method of claim 2 , wherein the reconstructing further comprises mapping fitted parameters of the model to the common layout.
4. The method of claim 2 , wherein the reconstructing further comprises interpolating residuals from the fitting to the common layout.
5. The method of claim 1 , wherein the first and/or second monitoring data comprises inter-field data corresponding to a plurality of lithographic exposure fields and intra-field data corresponding to a specific lithographic exposure field.
6. The method of claim 5 , further comprising processing the inter-field data separately from the intra-field data.
7. The method of claim 6 , further comprising combining the separately processed inter-field and intra-field data to allow comparison of the first and second monitoring data in a common layout.
8. The method of claim 1 , wherein the lithographic matching performance comprises overlay matching performance and the first and/or second monitoring data comprises a grid of overlay measurements.
9. The method of claim 8 , wherein the determining of the lithographic matching performance between the first lithographic apparatus and the second lithographic apparatus comprises modeling a difference between a first grid of overlay measurements associated with the first lithographic apparatus and a second grid of overlay measurements associated with the second lithographic apparatus.
10. The method of claim 9 , further comprising using the modeled difference in configuring the first and/or second lithographic apparatus.
11. The method of claim 10 , wherein the configuring comprises defining an offset with respect to a nominal grid definition associated with the first and/or second lithographic apparatus.
12. The method of claim 10 , wherein the first lithographic apparatus is configured, and wherein the first lithographic apparatus has more correction potential than the second lithographic apparatus.
13. The method of claim 1 , wherein the first and/or second monitoring data is obtained by measuring one or more monitoring substrates periodically processed on the respective first and/or second lithographic apparatus.
14. The method of claim 13 , wherein the first monitoring data is obtained from exposures of the one or more monitoring substrates that were contemporaneous with exposure of one or more substrates to be exposed in the second lithographic apparatus depending on the determination of the lithographic matching performance.
15. A non-transitory computer program product comprising machine readable instructions therein, the instructions, when executed by a general-purpose data processing apparatus, configured to cause the general-purpose data processing apparatus to at least:
obtain first monitoring data in a first layout from recurrent monitoring for stability control of a first lithographic apparatus;
obtain second monitoring data in a second layout from recurrent monitoring for stability control of a second lithographic apparatus; and
determine a lithographic matching performance between the first lithographic apparatus and the second lithographic apparatus based on the first monitoring data and the second monitoring data, wherein the determination of the lithographic matching performance comprises reconstruction of the first and/or second monitoring data into a common spatial layout to allow comparison of the first and second monitoring data.
16. The computer program product of claim 15 , wherein the reconstruction comprises fitting of the respective first and/or second monitoring data to a model of a lithographic process of the respective first and/or second lithographic apparatus to predict reconstructed monitoring data in the common layout.
17. The computer program product of claim 16 , wherein the reconstruction further comprises mapping of fitted parameters of the model to the common layout.
18. The computer program product of claim 16 , wherein the reconstruction further comprises interpolation of residuals from the fitting to the common layout.
19. The computer program product of claim 15 , wherein the monitoring data comprises inter-field data corresponding to a plurality of lithographic exposure fields and intra-field data corresponding to a specific lithographic exposure field.
20. The computer program product of claim 19 , wherein the instructions are further configured to cause the general-purpose data processing apparatus to process the inter-field data separately from the intra-field data.