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公开(公告)号：US12189314B2
公开(公告)日：2025-01-07
申请号：US18035008
申请日：2021-11-04
Applicant: ASML NETHERLANDS B.V.
Inventor： Sebastianus Adrianus Goorden , Simon Gijsbert Josephus Mathijssen , Leendert Jan Karssemeijer , Manouk Rijpstra , Ralph Brinkhof , Kaustuve Bhattacharyya
Abstract: A method for a metrology process, the method includes obtaining first measurement data relating to a first set of measurement conditions and determining a first measurement recipe based on the first measurement data. At least one performance indicator is determined from one or more components of the first measurement data obtained from a component analysis or statistical decomposition. Alternatively, at least one performance indicator is determined from a comparison of one or more first measurement values relating to the first measurement recipe and one or more second measurement values relating to a second measurement recipe, where second measurement recipe is different to the first measurement data and relates a second set of measurement conditions, the second set of measurement conditions being different to the first set of measurement conditions.
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公开(公告)号：US12189305B2
公开(公告)日：2025-01-07
申请号：US18004555
申请日：2021-05-27
Applicant: ASML Netherlands B.V.
Inventor： Simon Gijsbert Josephus Mathijssen , Patricius Aloysius Jacobus Tinnemans , Arie Jeffrey Den Boef , Kaustuve Bhattacharyya , Samee Ur Rehman
Abstract: Disclosed is a method of improving a measurement of a parameter of interest. The method comprises obtaining metrology data comprising a plurality of measured values of the parameter of interest, relating to one or more targets on a substrate, each measured value relating to a different measurement combination of a target of said one or more targets and a measurement condition used to measure that target and asymmetry metric data relating to asymmetry for said one or more targets. A respective relationship is determined for each of said measurement combinations relating a true value for the parameter of interest to the asymmetry metric data, based on an assumption that there is a common true value for the parameter of interest over said measurement combinations. These relationships are used to improve a measurement of the parameter of interest.
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公开(公告)号：US11640116B2
公开(公告)日：2023-05-02
申请号：US16893619
申请日：2020-06-05
Applicant: ASML NETHERLANDS B.V.
Inventor： Arie Jeffrey Den Boef , Kaustuve Bhattacharyya
Abstract: A method including determining a type of structural asymmetry of the target from measured values of the target, and performing a simulation of optical measurement of the target to determine a value of an asymmetry parameter associated with the asymmetry type. A method including performing a simulation of optical measurement of a target to determine a value of an asymmetry parameter associated with a type of structural asymmetry of the target determined from measured values of the target, and analyzing a sensitivity of the asymmetry parameter to change in a target formation parameter associated with the target. A method including determining a structural asymmetry parameter of a target using a measured parameter of radiation diffracted by the target, and determining a property of a measurement beam of the target based on the structural asymmetry parameter that is least sensitive to change in a target formation parameter associated with the target.
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公开(公告)号：US11385553B2
公开(公告)日：2022-07-12
申请号：US17306670
申请日：2021-05-03
Applicant: ASML Netherlands B.V.
Inventor： Zili Zhou , Nitesh Pandey , Olger Victor Zwier , Patrick Warnaar , Maurits Van Der Schaar , Elliott Gerard McNamara , Arie Jeffrey Den Boef , Paul Christiaan Hinnen , Murat Bozkurt , Joost Jeroen Ottens , Kaustuve Bhattacharyya , Michael Kubis
IPC: G03F7/20 , G01N21/47 , G01N21/95 , G01N21/956 , G03F9/00
Abstract: A method of measuring overlay uses a plurality of asymmetry measurements from locations (LOI) on a pair of sub-targets (1032, 1034) formed on a substrate (W). For each sub-target, the plurality of asymmetry measurements are fitted to at least one expected relationship (1502, 1504) between asymmetry and overlay, based on a known bias variation deigned into the sub-targets. Continuous bias variation in one example is provided by varying the pitch of top and bottom gratings (P1/P2). Bias variations between the sub-targets of the pair are equal and opposite (P2/P1). Overlay (OV) is calculated based on a relative shift (xs) between the fitted relationships for the two sub-targets. The step of fitting asymmetry measurements to at least one expected relationship includes wholly or partially discounting measurements (1506, 1508, 1510) that deviate from the expected relationship and/or fall outside a particular segment of the fitted relationship.
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公开(公告)号：US10831111B2
公开(公告)日：2020-11-10
申请号：US16073362
申请日：2017-02-21
Applicant: ASML NETHERLANDS B.V.
Inventor： Kaustuve Bhattacharyya
IPC: G03F7/20
Abstract: A method of measuring a target, an associated lithographic method, an associated computer program product and an associated litho cell is provided, wherein the method includes measuring the target subsequent to exposure of structures by a lithographic process in a current layer on a substrate over one or more preceding layers, wherein the one or more preceding layers have each undergone an etch step, and wherein the target is only in at least one of the one or more preceding layers. In this way, an after-etch measurement of the target can be obtained.
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Patent Agency Ranking
公开(公告)号：US10809628B2
公开(公告)日：2020-10-20
申请号：US16028953
申请日：2018-07-06
Applicant: ASML Netherlands B.V.
Inventor： Arie Jeffrey Den Boef , Kaustuve Bhattacharyya
IPC: G03F7/20 , H01L23/544 , G03F9/00
Abstract: Metrology targets are formed by a lithographic process, each target comprising a bottom grating and a top grating. Overlay performance of the lithographic process can be measured by illuminating each target with radiation and observing asymmetry in diffracted radiation. Parameters of metrology recipe and target design are selected so as to maximize accuracy of measurement of overlay, rather than reproducibility. The method includes calculating at least one of a relative amplitude and a relative phase between (i) a first radiation component representing radiation diffracted by the top grating and (ii) a second radiation component representing radiation diffracted by the bottom grating after traveling through the top grating and intervening layers. The top grating design may be modified to bring the relative amplitude close to unity. The wavelength of illuminating radiation in the metrology recipe can be adjusted to bring the relative phase close to π/2 or 3π/2.
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公开(公告)号：US10656533B2
公开(公告)日：2020-05-19
申请号：US16106322
申请日：2018-08-21
Applicant: ASML Netherlands B.V.
Abstract: An apparatus and method for estimating a parameter of a lithographic process and an apparatus and method for determining a relationship between a measure of quality of an estimate of a parameter of a lithographic process are provided. In the apparatus for estimating the parameter a processor is configured to determine a quality of the estimate of the parameter relating to the tested substrate based on a measure of feature asymmetry in the at least first features of the tested substrate and further based on a relationship determined for a plurality of corresponding at least first features of at least one further substrate representative of the tested substrate, the relationship being between a measure of quality of an estimate of the parameter relating to the at least one further substrate and a measure of feature asymmetry in the corresponding first features.
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公开(公告)号：US20190271915A1
公开(公告)日：2019-09-05
申请号：US16413985
申请日：2019-05-16
Applicant: ASML NETHERLANDS B.V.
Inventor： Arie Jeffrey DEN BOEF , Kaustuve Bhattacharyya
IPC: G03F7/20 , G01N21/47 , G01N21/956
Abstract: A method including: obtaining a measurement of a metrology target on a substrate processed using a patterning process, the measurement having been obtained using measurement radiation; and deriving a parameter of interest of the patterning process from the measurement, wherein the parameter of interest is corrected by a stack difference parameter, the stack difference parameter representing an un-designed difference in physical configuration between adjacent periodic structures of the target or between the metrology target and another adjacent target on the substrate.
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公开(公告)号：US20190004437A1
公开(公告)日：2019-01-03
申请号：US16010320
申请日：2018-06-15
Applicant: ASML NETHERLANDS B.V.
Inventor： Kaustuve Bhattacharyya , Simon Gijsbert Josephus Mathijssen , Marc Johannes Noot , Arie Jeffrey Den Boef , Mohammadreza Hajiahmadi , Farzad Farhadzadeh
CPC classification number: G03F7/70625 , G01B11/272 , G01B2210/56 , G03F7/70058 , G03F7/70633
Abstract: A method including: for a metrology target, having a first biased target structure and a second differently biased target structure, created using a patterning process, obtaining metrology data including signal data for the first target structure versus signal data for the second target structure, the metrology data being obtained for a plurality of different metrology recipes and each metrology recipe specifying a different parameter of measurement; determining a statistic, fitted curve or fitted function through the metrology data for the plurality of different metrology recipes as a reference; and identifying at least two different metrology recipes that have a variation of the collective metrology data of the at least two different metrology recipes from a parameter of the reference that crosses or meets a certain threshold.
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20.发明申请公开(公告)号：US20170314915A1
公开(公告)日：2017-11-02
申请号：US15649173
申请日：2017-07-13
Applicant: ASML Netherlands B.V.
IPC: G01B11/27 , G03F7/20 , G01B11/30 , H01L23/544
CPC classification number: G01B11/27 , G01B11/30 , G03F7/20 , G03F7/70633 , H01L23/544 , H01L2924/0002 , H01L2924/00
Abstract: A lithographic process is used to form a plurality of target structures distributed at a plurality of locations across a substrate and having overlaid periodic structures with a number of different overlay bias values distributed across the target structures. At least some of the target structures comprising a number of overlaid periodic structures (e.g., gratings) that is fewer than said number of different overlay bias values. Asymmetry measurements are obtained for the target structures. The detected asymmetries are used to determine parameters of a lithographic process. Overlay model parameters including translation, magnification and rotation, can be calculated while correcting the effect of bottom grating asymmetry, and using a multi-parameter model of overlay error across the substrate.
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