JP2014229881A - Imprint device, imprint method, and method of manufacturing article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imprint device using a technology which precisely positions a mold to a substrate.SOLUTION: An imprint device 100 for transferring a pattern of a mold, includes: a heating part 50 for heating a substrate 11 to deform a shot area; and a measuring part 22 for measuring a deviation amount between a pattern area 7a and the shot area of the substrate, and a difference between a shape of the pattern area 7a and a shape of the shot area. A control part 6 estimates a shift amount indicating an amount of a shift of the shot area in a surface direction when the substrate 11 is heated by the heating part 50 so as to correct the shape difference, on the basis of information for controlling the heating by the heating part, and in positioning controls driving on the basis of the deviation amount and the shift amount so as to bring a positional difference in the surface direction between the pattern area 7a and the shot area into a permissible range.

Description

  The present invention relates to an imprint apparatus, an imprint method, and an article manufacturing method.

  An imprint technique for transferring a pattern formed on a mold to an imprint material on a substrate has attracted attention as one of lithography techniques for mass production of magnetic storage media and semiconductor devices. In an imprint apparatus using such a technique, a mold on which a pattern is formed and an imprint material supplied on a substrate are brought into contact with each other, and the imprint material is cured in that state. And a pattern can be formed on a board | substrate by peeling a mold from the hardened imprint material.

  In manufacturing a semiconductor device or the like, it is necessary to superimpose a plurality of layers of patterns on a substrate. Therefore, in the imprint apparatus, it is important to accurately align and transfer the mold pattern to the shot area formed on the substrate. In view of this, there has been proposed a method of aligning the substrate and the mold by controlling the temperature of the substrate and the mold by utilizing their thermal expansion characteristics (see Patent Document 1).

JP 2004-259985 A

  When the positions of the substrate and the mold are controlled and their alignment is performed, the relative position between the substrate and the mold may change as the temperature changes. Patent Document 1 does not mention such a problem.

  Accordingly, an object of the present invention is to provide a technique advantageous in accurately performing alignment between a mold and a substrate in an imprint apparatus.

  In order to achieve the above object, an imprint apparatus according to one aspect of the present invention contacts a mold having a pattern region on which a pattern is formed with an imprint material on a substrate, and cures the imprint material. The imprint apparatus for transferring the pattern of the mold to the shot area on the substrate by the heating unit that heats the substrate and deforms the shot area, and the pattern in a plane direction along the surface of the substrate A measurement unit that measures a positional deviation amount between the region and the shot region, and a shape difference indicating a difference between the shape of the pattern region and the shape of the shot region, and after the measurement by the measurement unit, Based on the measurement result, the heating by the heating unit and the driving of at least one of the mold and the substrate are controlled, and the pattern region and the front A control unit that performs alignment with the shot region, and the control unit heats the substrate by the heating unit so that the shape difference is corrected, so that the shot region is shifted in the plane direction. A shift amount indicating an amount is estimated based on information for controlling heating by the heating unit, and in the alignment, a position difference in the surface direction between the pattern region and the shot region falls within an allowable range. As described above, the drive is controlled based on the positional deviation amount and the shift amount.

  According to the present invention, for example, in an imprint apparatus, it is an exemplary object to provide a technique advantageous in accurately performing alignment between a mold and a substrate.

It is a figure which shows the imprint apparatus of 1st Embodiment. It is a figure which shows the structure of the board | substrate holding part and its periphery in the board | substrate stage of 1st Embodiment. It is a flowchart which shows the operation | movement sequence from a stamping process in 1st Embodiment to a hardening process. It is a figure for demonstrating the shift amount which shows the amount which a shot area | region shifts to an XY direction by heating a board | substrate.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. In addition, in each figure, the same reference number is attached | subjected about the same member thru | or element, and the overlapping description is abbreviate | omitted. In each figure, directions perpendicular to each other on the substrate surface are defined as an X direction and a Y direction, respectively, and a direction perpendicular to the substrate surface is defined as a Z direction.

<First Embodiment>
An imprint apparatus 100 according to a first embodiment of the present invention will be described with reference to FIG. The imprint apparatus 100 is used for manufacturing a semiconductor device or the like, and cures the imprint material in a state where the pattern-formed mold 7 is in contact with the imprint material (resin) on the substrate. The imprint apparatus 100 can transfer the pattern of the mold 7 onto the substrate by widening the gap between the substrate 11 and the mold 7 and peeling the mold 7 from the cured imprint material. Methods for curing the imprint material include a thermal cycle method using heat and a photocuring method using light, and the imprint apparatus 100 of the first embodiment employs a photocuring method. In the photocuring method, an uncured ultraviolet curable resin (hereinafter, resin 14) is supplied onto the substrate as an imprint material, and the resin 14 is irradiated with ultraviolet rays while the mold 7 and the resin 14 are in contact with each other. In this method, the resin 14 is cured. After the resin 14 is cured by irradiation with ultraviolet rays, the pattern can be formed on the substrate by peeling the mold 7 from the resin 14.

  FIG. 1 is a diagram illustrating an imprint apparatus 100 according to the first embodiment. The imprint apparatus 100 includes a mold holding unit 3 that holds a mold 7, a substrate stage 4 that holds a substrate 11, an irradiation unit 2, a resin supply unit 5, and a measurement unit 22. The mold holding unit 3 is fixed to the bridge surface plate 25 supported by the base surface plate 24 via the support column 26, and the substrate stage 4 is fixed to the base surface plate 24. The imprint apparatus 100 includes a CPU and a memory, and includes a control unit 6 that controls imprint processing (controls each unit of the imprint apparatus 100).

  The mold 7 is usually made of a material that can transmit ultraviolet rays such as quartz, and an uneven pattern to be transferred to the substrate 11 is formed in a partial region (pattern region 7a) on the substrate side surface. Has been. The substrate 11 is, for example, a single crystal silicon substrate or an SOI (Silicon on Insulator) substrate. Resin 14 (ultraviolet curable resin) is supplied to the upper surface (surface to be processed) of the substrate 11 by a resin supply unit 5 described later.

  The mold holding unit 3 includes, for example, a mold chuck 15 that holds the mold 7 by holding force such as vacuum adsorption force or electrostatic force, and a mold driving unit 16 that drives the mold chuck 15 in the Z direction. The mold chuck 15 and the mold driving unit 16 have an opening region 17 at the center (inside) thereof, and are configured such that light emitted from the irradiation unit 2 is irradiated onto the substrate 11 through the mold 7. Has been. Here, the pattern region 7a of the mold 7 may be deformed including components such as a magnification component and a base formation due to manufacturing errors and thermal deformation. Therefore, the mold holding unit 3 includes a deforming unit 18 that deforms the mold 7 by applying force from a plurality of locations on the side surface of the mold 7. In this way, by applying force from the plurality of locations by the deforming portion 18, the deformation in the pattern region 7 a of the mold 7 can be corrected.

  The mold drive unit 16 includes an actuator such as a linear motor or an air cylinder, for example, and drives the mold chuck 15 (mold 7) in the Z direction so that the mold 7 and the resin 14 on the substrate are brought into contact with each other or separated. To do. The mold driving unit 16 is required to be positioned with high accuracy when the mold 7 and the resin 14 on the substrate are brought into contact with each other. Therefore, the mold driving unit 16 may be configured by a plurality of driving systems such as a coarse driving system and a fine driving system. Good. Further, the mold driving unit 16 corrects not only the driving in the Z direction but also the position adjusting function for adjusting the position of the mold 7 in the XY direction and the θ direction (rotating direction around the Z axis) and the inclination of the mold 7. The tilt function may be provided. Here, in the imprint apparatus 100 of the first embodiment, the operation of changing the distance between the mold 7 and the substrate 11 is performed by the mold driving unit 16, but may be performed by the stage driving unit 20 of the substrate stage 4. It is good and you may carry out relatively in both.

  The substrate stage 4 includes a substrate holding unit 19 and a stage driving unit 20, and drives the substrate 11 in the X direction and the Y direction. The substrate holding unit 19 holds the substrate 11 with a holding force such as a vacuum suction force or an electrostatic force, for example. The stage driving unit 20 mechanically holds the substrate holding unit 19 and drives the substrate holding unit 19 (substrate 11) in the X direction and the Y direction. For example, a linear motor or the like is used as the stage driving unit 20 and may be configured by a plurality of driving systems such as a coarse driving system and a fine driving system. Further, the stage drive unit 20 corrects the drive function for driving the substrate 11 in the Z direction, the position adjustment function for rotating the substrate 11 in the θ direction to adjust the position of the substrate 11, and the inclination of the substrate 11. It may have a tilt function.

  The measurement unit 22 is configured to detect the amount of positional deviation between the pattern region 7a on the mold and the shot region 12 on the substrate in the surface direction (XY direction) along the surface of the substrate 11, the shape of the pattern region 7a, and the shape of the shot region 12. The difference in shape indicating the difference between the two is measured. For example, as a method of measuring the positional deviation amount and the shape difference, there is a method of detecting a plurality of alignment marks respectively provided in the pattern region 7a and the shot region 12. The alignment mark in the pattern area 7a and the alignment mark in the shot area 12 are arranged so as to overlap each other when the pattern area 7a and the shot area 12 are matched in the XY direction. Then, the measurement unit 22 detects the amount of misalignment between the alignment mark in the pattern area 7a and the alignment mark in the shot area 12 corresponding thereto in each of the plurality of alignment marks. Thereby, the measurement part 22 can measure the positional deviation amount and the shape difference between the pattern area 7a and the shot area 12 in the XY directions.

  Here, the shot region 12 on the substrate may be deformed including components such as a magnification component and a base formation due to the influence of, for example, a series of semiconductor device manufacturing processes. In this case, in order to accurately transfer the pattern of the mold 7 to the shot region 12 on the substrate, it is necessary to deform the shot region 12 in addition to the deformation of the pattern region 7a on the mold by the deforming portion 18. There is. Therefore, the imprint apparatus 100 according to the first embodiment includes a heating unit 50 that heats the substrate 11 by irradiating the substrate 11 with light and deforms the shot region 12 as described later.

  The irradiation unit 2 includes an exposure unit 9 that emits light that cures the resin 14 on the substrate, a heating unit 50 that emits light that heats the substrate 11, and the light emitted from the exposure unit 9 and the heating unit 50. And an optical member 10 for guiding the emitted light onto the substrate. In the imprint apparatus 100 according to the first embodiment, the exposure unit 9 and the heating unit 50 are configured as one unit as shown in FIG. 1, but are not limited thereto, and are configured as separate units. May be. The exposure unit 9 may include a light source that emits light (ultraviolet light) that cures the resin 14 on the substrate, and an optical system that shapes the light emitted from the light source into appropriate light in an imprint process. The heating unit 50 may include a light source that emits light for heating the substrate 11 and a light adjuster for adjusting the intensity of the light emitted from the light source. The heating unit 50 is configured to emit light having a specific wavelength suitable for heating the substrate 11 without curing the resin 14 supplied onto the substrate. As a method of emitting light having a specific wavelength from the heating unit 50, for example, light having the specific wavelength may be directly emitted from the light source of the heating unit 50, or the light source of the heating unit 50 may be An optical filter that transmits only light having a specific wavelength may be provided. The light adjuster of the heating unit 50 adjusts the intensity of light applied to the substrate 11 so that the temperature distribution in the shot region 12 becomes a desired temperature distribution. For example, a liquid crystal device, a digital mirror device (DMD), or the like can be employed as the optical adjuster of the heating unit 50. The liquid crystal device can change the intensity of light applied to the substrate 11 by arranging a plurality of liquid crystal elements on a light transmission surface and individually controlling the voltage applied to each of the plurality of liquid crystal elements. . The digital mirror device can change the intensity of light applied to the substrate 11 by arranging a plurality of mirror elements on a light reflecting surface and individually adjusting the surface direction of each mirror element.

  The resin supply unit 5 supplies (applies) the resin 14 (uncured resin) on the substrate. As described above, in the first embodiment, an ultraviolet curable resin (imprint material) having a property of being cured by irradiation with ultraviolet rays is used. The resin 14 supplied onto the substrate from the resin supply unit 5 can be appropriately selected according to various conditions in the semiconductor device manufacturing process. Further, the amount of resin discharged from the discharge nozzle of the resin supply unit 5 can be appropriately determined in consideration of the thickness of the pattern formed on the resin 14 on the substrate, the density of the pattern, and the like. Here, in order to fully fill the pattern formed on the mold 7 with the resin 14 supplied on the substrate, a certain time may be allowed to elapse while the mold 7 and the resin 14 are in contact with each other.

  The imprint apparatus 100 according to the first embodiment configured as described above includes the heating unit 50 in the irradiation unit 2, and the substrate 11 is irradiated with light by the heating unit 50 to apply heat, thereby causing the shot region 12 on the substrate. Is deformed. When the shot area 12 is deformed, generally, the entire bottom surface of the substrate 11 is held by the substrate holding unit 19. However, in this state, if the thermal stress generated according to the temperature change of the substrate 11 is not larger than the frictional force generated between the substrate 11 and the substrate holding portion 19, the shot region is quickly and sufficiently deformed. Is difficult. Therefore, the substrate holding unit 19 in the first embodiment is configured to be able to change the holding force applied to each of the plurality of portions in the substrate 11. FIG. 2 is a diagram illustrating a configuration of the substrate holding unit 19 and its periphery in the substrate stage 4 of the first embodiment. Hereinafter, the case where a vacuum suction force is used as the holding force applied to the substrate 11 will be described with reference to FIG.

  The substrate holding unit 19 includes, for example, a plurality of suction units 51 so that the holding force applied to each of the plurality of portions of the substrate 11 can be changed. Although the board | substrate holding | maintenance part 19 shown in FIG. 2 contains the three adsorption | suction parts 51a-51c, the number of the adsorption | suction parts 51 is not limited to three, It can be made into arbitrary numbers. These adsorption | suction parts 51a-51c are each connected to the pressure adjustment part 52, and the pressure adjustment part 52 can change the pressure of each adsorption | suction part 51a-51c separately. That is, the holding force (vacuum suction force) for holding the substrate 11 by each of the suction units 51a to 51c can be individually adjusted. Therefore, the frictional force between the portions 11a to 11c of the substrate 11 and the substrate holding portion 19 held by the suction portions 51a to 51c can be individually changed for the portions 11a to 11c of the substrate.

  For example, as shown in FIG. 2, a case is assumed where heat is applied to the substrate 11 by the heating unit 50 to deform the shot region 12 disposed in the peripheral portion (part 11 a) of the substrate 11. In this case, the holding force of the suction portion 51a that holds the portion 11a (first portion) where the shot region 12 to be heated and aligned is arranged is made smaller than the holding force of the suction portions 51b and 51c. Unlike the first portion, the suction portions 51b and 51c respectively hold portions 11b and 11c (second portion) where the shot region 12 is not disposed. For example, the pressure of the adsorption part 51a is set to atmospheric pressure. As a result, the frictional force between the first part (part 11a) on the substrate held by the suction part 51a and the substrate holding part 19 is changed to the second part (part 11b and the part held by the suction parts 51b and 51c). 11c) and the frictional force between the substrate holding part and the substrate holding part. That is, while the substrate is heated by the heating unit 50 and the shot region 12 is deformed, the frictional force can be made smaller in the portion 11a than when the shot region 12 is not deformed. For this reason, the shot region 12 can be quickly and sufficiently deformed. Here, in the first embodiment, the method of holding the substrate using the vacuum suction force as the holding force applied to the substrate is adopted, but the method is not limited to this, and for example, by other force such as electrostatic force. You may employ | adopt the system which hold | maintains a board | substrate.

  Next, the flow of imprint processing in the imprint apparatus 100 according to the first embodiment will be described. The control unit 6 moves the substrate 11 by controlling the substrate stage 4 so that the shot region 12 on the substrate to which the pattern of the mold 7 is to be transferred is disposed below the resin supply unit 5. When the shot region 12 is disposed below the resin supply unit 5, the control unit 6 controls the resin supply unit 5 so as to supply the resin 14 (uncured resin) to the shot region 12. Then, after the resin 14 is supplied to the shot region 12, the control unit 6 controls the substrate stage 4 so that the shot region 12 is disposed under the pattern region 7a on the mold, and moves the substrate 11. . When the shot region 12 is arranged under the pattern region 7a on the mold, the control unit 6 controls the mold driving unit 16 so as to drive the mold 7 in the −Z direction, and the mold 7 and the resin 14 on the substrate 14 are controlled. Are brought into contact with each other (molding process). And the control part 6 makes predetermined time pass in the state which made the mold 7 and the resin 14 on a board | substrate contact. Thereby, the resin 14 on the substrate can be filled to every corner of the pattern of the mold 7.

  The control unit 6 causes the measurement unit 22 to detect the alignment mark of the mold 7 and the alignment mark of the shot region 12 in a state where the mold 7 and the resin 14 on the substrate are in contact with each other. Thereby, the control unit 6 can measure the positional deviation amount between the pattern region 7a and the shot region 12 in the XY direction and the shape difference between the pattern region 7a and the shot region 12 by the measuring unit 22. Then, after the measurement by the measurement unit 22, the control unit 6 aligns the pattern region 7a and the shot region 12 based on the measurement result of the measurement unit 22. For alignment between the pattern area 7a and the shot area 12, for example, shift correction for changing the relative positions of the pattern area 7a and the shot area 12 in the XY direction and a shape difference between the pattern area 7a and the shot area 12 are corrected. Shape correction to be performed. The shift correction is performed by moving the mold in the XY direction under the control of the mold driving unit 16 or moving the substrate 11 in the XY direction under the control of the stage driving unit 20. The shape correction is performed by applying a force from the side surface of the mold 7 by the deforming unit 18 to deform the pattern region 7a, or by heating the substrate 11 by the heating unit 50 to deform the shot region 12.

  After aligning the pattern region 7a and the shot region 12, the control unit 6 controls the exposure unit 9 so that the resin 14 on the substrate is irradiated with light (ultraviolet rays) through the mold 7 (curing process). ). Then, the control unit 6 controls the mold driving unit 16 so that the mold 7 moves in the + Z direction, and peels the mold 7 from the resin 14 on the cured substrate by irradiation with light. Thereby, the pattern of the mold 7 can be transferred to the resin 14 on the substrate. Such an imprint process is performed for each of the plurality of shot areas 12 on the substrate.

  As described above, in the imprint apparatus 100 according to the first embodiment, when aligning the pattern region 7a on the mold and the shot region 12 on the substrate, the shot region 12 is heated by heating the substrate 11 by the heating unit 50. Is deformed. However, when the substrate 11 is heated by the heating unit 50 in order to deform the shot region 12, the shot region 12 may shift in the XY direction (plane direction) as the temperature of the substrate 11 changes. Therefore, the imprint apparatus 100 according to the first embodiment controls the heating by the heating unit 50 with a shift amount indicating the amount by which the shot region 12 is shifted in the XY direction by heating the substrate 11 by the heating unit 50. Estimate based on information. Then, the imprint apparatus 100 detects the amount of misalignment measured by the measurement unit 22 at the time of alignment so that the difference in position in the XY direction between the pattern area and the shot area after the alignment is within an allowable range. And shift correction based on the estimated shift amount.

  Here, in the imprint apparatus 100 of the first embodiment, for example, an imprint process for transferring the pattern of the mold 7 to the shot region 12 arranged in the peripheral portion (part 11a) of the substrate as shown in FIG. This will be described with reference to FIG. FIG. 3 is a flowchart showing an operation sequence from the stamping process to the curing process in the imprint process in which the pattern of the mold 7 is transferred to the shot region 12 arranged in the peripheral portion (part 11a) of the substrate.

  In S <b> 101, the control unit 6 holds the holding force (vacuum suction) of the suction unit 51 that holds the portion 11 a (first portion) where the shot region 12 to which the pattern of the mold 7 is transferred is arranged among the plurality of portions on the substrate 11. Power). For example, as shown in FIG. 2, when the portion 11a (first portion) where the shot region 12 is arranged is held by the suction portion 51a, the control portion 6 sets the pressure of the suction portion 51a to atmospheric pressure, etc. The holding force of the suction part 51a is made smaller than the holding force of the suction parts 51b and 51c. Thereby, the friction force generated in the portion 11a (first portion) on the substrate held by the suction portion 51a is the friction generated in the portions 11b and 11c (second portion) on the substrate held by the suction portions 51b and 51c. Can be smaller than force. For this reason, the shot region 12 can be quickly and sufficiently deformed. Here, the holding force of the suction portion 51a that holds the portion 11a may be set so that the thermal stress generated according to the temperature change of the substrate 11 is larger than the frictional force between the portion 11a and the substrate holding portion 19. Further, when the shot area 12 is arranged across the plurality of suction portions 51, the holding force of the plurality of suction portions 51 may be reduced. For example, when the shot area 12 is disposed across the suction portions 51a and 51b, the holding force of the suction portions 51a and 51b is reduced.

  In S102, the control unit 6 causes the measurement unit 22 to measure the amount of positional deviation between the pattern region 7a and the shot region 12 in the XY direction and the shape difference between the pattern region 7a and the shot region 12 (first measurement). . In S103, the control unit 6 determines a correction value for correcting the shape difference measured by the measurement unit 22 in S102 (hereinafter, shape correction). The correction value for performing shape correction includes information for controlling deformation of the mold 7 by the deforming unit 18 (correction value in the deforming unit 18) and information for controlling heating by the heating unit 50 (heating unit 50). Correction value). The correction value in the deforming portion 18 includes information on the force that the deforming portion 18 applies to each of a plurality of locations on the side surface of the mold 7 so that the shape of the pattern region 7a on the mold becomes a target shape. Further, the correction value in the heating unit 50 includes information for the heating unit 50 to heat the substrate 11 so that the shape of the shot region 12 on the substrate becomes the target shape. The information for the heating unit 50 to heat the substrate 11 includes, for example, the heating amount W of the substrate by the heating unit, the range on the substrate heated by the heating unit (heating range d), and the shot region heated by the heating unit The position on the substrate (representative position P) can be included.

  In S104, the control unit 6 estimates a shift amount indicating the amount by which the shot region 12 is shifted in the XY direction by heating the substrate 11, based on the correction value in the heating unit 50 determined in S103. Here, the shift amount indicating the amount by which the shot region 12 shifts in the XY direction by heating the substrate 11 will be described with reference to FIG. In FIG. 4, the portion 11a in the substrate 11 is held by the suction portion 51a, the portion 11b in the substrate 11 is held by the suction portion 51b, and the portion 11c in the substrate 11 is held by the suction portion 51c. It is assumed that the shot area 12 for transferring the pattern of the mold 7 is disposed in the portion 11a, and the pressure of the suction portion 51a that holds the portion 11a is set to atmospheric pressure. Further, it is assumed that the portions 11b and 11c are sucked and held by the suction portions 51b and 51c, respectively, and do not shift in the X and Y directions when the substrate is heated by the heating portion. Therefore, the portions 11b and 11c in the substrate 11 are not allowed to be deformed in the XY directions, while the portion 11a in the substrate 11 is allowed to be deformed in the XY directions.

  When the substrate 11 is heated by the heating unit 50, the portion 11a undergoes thermal expansion in the −X direction with reference to the portion 11b adjacent thereto, that is, the boundary portion between the portion 11a and the portion 11b. Region 12 shifts in the -X direction. At this time, as shown in FIG. 4, the shift amount L is the amount by which the representative position P in the shot region 12 (for example, the center of the shot region 12) is shifted in the −X direction. In FIG. 4, the shot region 12 before the substrate 11 is heated by the heating unit 50 is represented by a solid line, and the shot region 12 ′ after the substrate 11 is heated by the heating unit 50 is represented by a broken line. In FIG. 4, the dimensional ratio between the shot region 12 and the shot region 12 ′ is actually shown in order to clearly show the change in the shape of the shot region 12 before and after the substrate 11 is heated by the heating unit 50. Is very different. The range (heating range d) on the substrate heated by the heating unit 50 is the range of the shot region 12, and here, the length of the shot region in the X direction is defined as the heating range d.

  The shift amount L is estimated based on information (heating amount W, heating range d, representative position P) for controlling heating by the heating unit 50 and physical property values of the substrate 11. The physical property value of the substrate 11 includes a linear expansion coefficient, a thermal conductivity, and the like of a material (for example, single crystal silicon) used as the substrate 11. Here, as a physical property value of the substrate 11, a linear expansion coefficient will be described as an example. For example, the control unit 6 stores a function for obtaining the temperature increase amount ΔT by the finite element method or the like using the linear expansion coefficient α, the heating amount W, the heating range d, and the representative position P of the substrate 11. The temperature increase amount ΔT is calculated by using the function. The shift amount L of the representative position P in the shot region 12 can be estimated by the equation (1) using the temperature increase amount ΔT, the linear expansion coefficient α of the substrate 11 and the heating range d. Here, in the first embodiment, the shift amount of the shot region 12 due to the heating of the substrate 11 by the heating unit 50 is set in the X direction in which the shift of the shot region 12 becomes large due to the influence of the holding of the substrate 11 by the substrate holding unit 19. However, it is not limited to that. For example, the shift amount in the Y direction may be estimated according to the configuration of the substrate holding unit 19 and the method of holding the substrate 11.

  In the imprint apparatus 100 of the first embodiment, the shift amount L of the shot region 12 due to the heating of the substrate 11 by the heating unit 50 is estimated by a calculation formula, but is not limited thereto. For example, the shift amount L of the shot region 12 may be obtained in advance by finite element analysis or the like using the heating amount W, the heating range d, and the representative position P, and may be stored in the control unit 6 as a database. . The shift amount L of the shot area 12 may be experimentally obtained in advance in the imprint apparatus 100 and stored in the control unit 6 as a database. Then, the shift amount L of the shot area 12 is determined from the database according to the information (heating amount W, heating range d, representative position P) for controlling the heating by the heating unit 50 determined by the control unit 6 in S103. (Estimation) may be performed.

  In S105, the control unit 6 determines a correction value for correcting the relative position between the pattern region 7a and the shot region 12 (hereinafter referred to as shift correction) measured by the measurement unit 22 in S102. As described above, when the substrate 11 is heated by the heating unit 50 in order to deform the shot region 12, the shot region 12 may shift in the XY direction as the temperature of the substrate 11 changes. Therefore, the correction value for performing the shift correction includes the shot area estimated in S104 in addition to the correction value for correcting the positional deviation amount between the pattern area 7a and the shot area 12 measured by the measurement unit 22 in S102. A correction value for correcting the shift amount of 12 is also included. In this way, by determining the correction value so that the positional deviation amount and the shift amount are corrected, the pattern region 7a and the shot region 12 can be compared with each other when the subsequent alignment process (S106 to S108) is completed. The difference in position in the XY direction can be within an allowable range. Here, in the flowchart shown in FIG. 3, S103, S104, and S105 are performed in that order, but they may not be performed in the order shown in FIG. 3, and they may be performed simultaneously.

  In S106, the control unit 6 controls the stage driving unit 20 based on the correction value for performing the shift correction determined in S105, and performs shift correction for correcting the relative position between the pattern area 7a and the shot area 12. . As described above, the correction value determined in S105 includes a correction value for correcting the positional deviation amount and a correction value for correcting the shift amount. Therefore, when the shift correction is performed based on the correction value determined in S105, the pattern area 7a and the shot area 12 are arranged so as to be shifted in the XY direction by the sum of the positional shift amount and the shift amount. .

  In S107, the control unit 6 controls the heating unit 50 based on the correction value in the heating unit 50 determined in S103 to heat the substrate 11. In S <b> 108, the control unit 6 controls the deformation unit 18 based on the correction value in the deformation unit 18 determined in S <b> 103 and applies force from a plurality of locations on the side surface of the mold 7. With S107 and S108, the shape difference between the pattern region 7a on the mold and the shot region 12 on the substrate can be kept within an allowable range. Further, since the substrate 11 is heated by the heating unit 50 in S107, the shot region 12 is shifted in the XY direction as described above. However, in the imprint apparatus 100 according to the first embodiment, in S108, the shift between the pattern region 7a and the shot region 12 is considered in consideration of the shift amount indicating the amount of shift of the shot region 12 in the XY direction due to the heating of the substrate 11. The position is changed. Therefore, when S108 is completed, not only can the shape difference between the pattern region 7a and the shot region 12 be within the allowable range, but also the positional difference between the pattern region 7a and the shot region 12 in the XY direction is within the allowable range. Can fit. Here, in the flowchart shown in FIG. 3, S106, S107, and S108 are performed in that order, but they may not be performed in the order shown in FIG. 3, and the order may be changed. They may be performed simultaneously.

  In S109, the control unit 6 uses the measurement unit 22 to measure the amount of positional deviation between the pattern region 7a and the shot region 12 in the XY direction and the shape difference between the pattern region 7a and the shot region 12 (second measurement). . In S110, the control unit 6 determines whether or not the positional deviation amount and the shape difference between the pattern area 7a and the shot area 12 are within allowable ranges. When the positional deviation amount and the shape difference are within the allowable ranges, the process proceeds to a curing step, and the resin 14 on the substrate is irradiated with light by the exposure unit 9 through the mold 7 to cure the resin 14. On the other hand, if the positional deviation amount and the shape difference are not within the allowable ranges, the process returns to S103. In the imprint apparatus 100 according to the first embodiment, in S106, shift correction is performed in consideration of a shift amount indicating an amount by which the shot region 12 is shifted in the XY directions by heating the substrate 11. Therefore, S109 and S110 can be performed as a confirmation step as to whether or not the alignment (S106 to S108) between the mold 7 and the substrate 11 has been performed normally. For example, during alignment, there may be cases where the positional deviation amount and the shape difference are not within the allowable ranges due to the influence of disturbances such as vibration from the floor where the device is installed and changes in environmental temperature. . In such a case, the process returns to S103 and the alignment between the mold and the substrate is performed again.

  As described above, the imprint apparatus 100 according to the first embodiment estimates the shift amount indicating the amount by which the shot region 12 is shifted in the XY direction (plane direction) by heating the substrate 11 by the heating unit 50. Then, the imprint apparatus 100 performs shift correction in the alignment between the mold 7 and the substrate 11 in consideration of the estimated shift amount. Thereby, since it is not necessary to newly provide a process for correcting the shift of the shot region 12 due to heating of the heating unit 50, the pattern of the mold 7 is transferred to the shot region 12 on the substrate with high accuracy without reducing the throughput. can do. Here, in the imprint apparatus 100 of the first embodiment, the processes of S103 to S105 in FIG. 3 are performed by the control unit 6, but the present invention is not limited to this. For example, the imprint apparatus 100 may be configured such that the correction value is calculated by performing steps S103 to S105 by a computer or the like outside the apparatus, and the control unit 6 acquires the calculated correction value.

<Embodiment of Method for Manufacturing Article>
The method for manufacturing an article according to an embodiment of the present invention is suitable for manufacturing an article such as a microdevice such as a semiconductor device or an element having a fine structure. In the method for manufacturing an article according to the present embodiment, a pattern is formed in a step of forming a pattern on the resin applied to the substrate using the above-described imprint apparatus (step of performing imprint processing on the substrate). Processing the substrate. Further, the manufacturing method includes other well-known steps (oxidation, film formation, vapor deposition, doping, planarization, etching, resist stripping, dicing, bonding, packaging, and the like). The method for manufacturing an article according to the present embodiment is advantageous in at least one of the performance, quality, productivity, and production cost of the article as compared with the conventional method.

  As mentioned above, although preferred embodiment of this invention was described, it cannot be overemphasized that this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

Claims (9)

An imprint apparatus that transfers a pattern of the mold to a shot area on the substrate by bringing a mold having a pattern area on which the pattern is formed into contact with an imprint material on the substrate and curing the imprint material. And
A heating unit that heats the substrate and deforms the shot region;
A measurement unit that measures a positional deviation amount between the pattern region and the shot region in a surface direction along the surface of the substrate, and a shape difference indicating a difference between the shape of the pattern region and the shape of the shot region;
After the measurement by the measurement unit, the heating by the heating unit and the driving of at least one of the mold and the substrate are controlled based on the measurement result of the measurement unit, and the pattern region and the shot region are aligned. A control unit for performing
Including
The control unit controls heating by the heating unit with a shift amount indicating an amount by which the shot region is shifted in the surface direction by heating the substrate by the heating unit so that the shape difference is corrected. Based on information for estimation,
In the alignment, the driving is controlled based on the positional shift amount and the shift amount so that a difference in position in the plane direction between the pattern region and the shot region is within an allowable range. Imprint device to do. A substrate holding part capable of changing holding force applied to each of the plurality of portions of the substrate;
The plurality of portions include a first portion having a shot region to be aligned, and a second portion different from the first portion,
The said control part controls the said board | substrate holding part so that the holding force applied to the said 1st part may become smaller than the holding force applied to the said 2nd part in the said alignment. 2. The imprint apparatus according to 1.   The control unit assumes that the second portion does not shift in the surface direction in heating the substrate by the heating unit, and the representative position in the shot region is the second position by heating the substrate by the heating unit. The imprint apparatus according to claim 2, wherein an amount of shift based on a part is estimated as the shift amount.   The control unit includes: a heating amount of the substrate by the heating unit; a range on the substrate heated by the heating unit; a position on the substrate of a shot region heated by the heating unit; and a physical property value of the substrate 4. The imprint apparatus according to claim 1, wherein the shift amount is estimated using at least one of the plurality of shift parameters. 5.   The heating unit includes a light source that emits light, and the substrate is heated to deform the shot region by irradiating the substrate with light emitted from the light source through the mold. The imprint apparatus according to any one of claims 1 to 4.   The said control part performs the measurement by the said measurement part after performing the said alignment, and confirms that the said shape difference is in the tolerance | permissible_range, The any one of Claims 1 thru | or 5 characterized by the above-mentioned. The imprint apparatus according to item.   The information for controlling the heating by the heating unit includes the amount of heating of the substrate by the heating unit, the range on the substrate heated by the heating unit, and the substrate in the shot region heated by the heating unit. The imprint apparatus according to claim 1, comprising at least one of the above positions. Forming a mold pattern on a substrate using the imprint apparatus according to any one of claims 1 to 7;
Processing the substrate on which the pattern is formed in the step;
A method for producing an article comprising: In an imprint apparatus including a heating unit that heats a substrate and deforms a shot region on the substrate, a mold having a pattern region on which a pattern is formed and an imprint material on the substrate are brought into contact with each other, and the imprint material An imprint method for transferring a pattern of the mold to the shot region by curing
A measurement step of measuring a positional deviation amount between the pattern region and the shot region in a plane direction along the surface of the substrate, and a shape difference indicating a difference between the shape of the pattern region and the shape of the shot region;
Based on the information for controlling the heating by the heating unit, the shift amount indicating the amount by which the shot region shifts in the plane direction by heating the substrate by the heating unit so that the shape difference is corrected. An estimation process to estimate
After the measurement in the measurement process, the heating by the heating unit and the driving of at least one of the mold and the substrate are controlled based on the measurement result in the measurement process, and the pattern area and the shot area are aligned. An alignment step of performing
Including
In the alignment step, the driving is controlled based on the positional deviation amount and the shift amount so that a difference in position between the pattern region and the shot region in the surface direction is within an allowable range. And imprint method.

Images