Control method of movable body, exposure method, device manufacturing method, movable body apparatus, and exposure apparatus
A control method of a movable body includes: a step of detecting a part of a plurality of grating marks provided at a wafer placed on a movable body that is movable within an XY plane, while scanning a measurement beam, that is irradiated from a mark detection system, in a Y-axis direction with respect to the part of plurality of grating marks, as moving the movable body in the Y-axis direction; a step of measuring an irradiation position of the measurement beam on the part of the plurality of grating marks; and a step of relatively moving the measurement beam and the movable body in an X-axis direction on the basis of the measurement result of the irradiation position and also detecting another grating mark while scanning the measurement beam in the Y-axis direction.
1. A control method of a movable body, comprising:
detecting a first mark of a plurality of marks provided at an object placed on a movable body while scanning a measurement beam in a direction of a first axis with respect to the first mark, as moving the movable body in the direction of the first axis, the measurement beam being irradiated from a mark detection system;
measuring a positional relationship between the first mark and the measurement beam; and
adjusting a relative position between the measurement beam and the movable body in a direction of a second axis, on the basis of the positional relationship that has been measured, the second axis intersecting the first axis.
2. The control method of the movable body according to claim 1 , comprising:
detecting a second mark, different from the first mark, of the plurality of marks while scanning the measurement beam in the direction of the first axis, as adjusting the relative position.
3. The control method of the movable body according to claim 2 , wherein
the second mark is a mark that is detected after detection of the first mark.
4. The control method of the movable body according to claim 3 , wherein
the detecting the second mark includes estimating a center position of the second mark on the basis of a detection result of the first mark.
5. The control method of the movable body according to claim 4 , further comprising:
comparing the positional shift amount obtained in the obtaining the positional shift amount, with a predetermined permissible value, wherein
in a case where the positional shift amount is greater than the permissible value, the detecting the first mark is performed again.
6. The control method of the movable body according to claim 2 , further comprising:
obtaining a positional shift amount between a center of the first mark and an irradiation position of the measurement beam, wherein
in the detecting the second mark, the movable body and the measurement beam are relatively moved in a direction of cancelling out the positional shift, in accordance with the positional shift amount obtained in the obtaining the positional shift amount.
7. The control method of the movable body according to claim 6 , wherein
the detecting the second mark includes estimating a center position of the second mark on the basis of a detection result of the first mark.
8. The control method of the movable body according to claim 6 , further comprising:
comparing the positional shift amount obtained in the obtaining the positional shift amount, with a predetermined permissible value, wherein
in a case where the positional shift amount is greater than the permissible value, the detecting the first mark is performed again.
9. The control method of the movable body according to claim 2 , further comprising:
moving the movable body along a predetermined movement course at a time of a detection operation of the first mark and the second mark, wherein
the first mark is a mark that can be detected first, of the plurality of marks, in a case where the movable body is moved along the movement course.
10. The control method of the movable body according to claim 2 , wherein
a velocity at which the movable body is moved when the measurement beam is irradiated on the first mark is slower than a velocity at which the movable body is moved when the measurement beam is irradiated on the second mark.
11. The control method of the movable body according to claim 10 , wherein
the velocity of the movable body is increased after the first mark has been detected.
12. The control method of the movable body according to claim 1 , wherein
the first mark includes two or more marks,
in the obtaining the positional shift amount, the positional shift amount is obtained for each of the two or more marks, and
adjustment of the relative position between the movable body and the measurement beam is performed on the basis of the positional shift amount for each of the two or more marks.
13. The control method of the movable body according to claim 12 , wherein
a movement trajectory of the movable body is calculated on the basis of the positional shift amount for each of the two or more marks.
14. The control method of the movable body according to claim 1 , further comprising:
obtaining positional information, within a two-dimensional plane that includes the first axis and the second axis, of the object on the movable body, and adjusting the relative position between the movable body and the measurement beam so that at least the first mark can be detected with the mark detection system.
15. The control method of the movable body according to claim 14 , wherein
in a case where the first mark cannot be detected with the mark detection system in the detecting the first mark, the adjustment of the relative position between the movable body and the measurement beam is performed.
16. The control method of the movable body according to claim 14 , wherein
the adjustment of the relative position between the movable body and the measurement beam is performed, prior to detection of the first mark.
17. The control method of the movable body according to claim 1 , further comprising:
obtaining surface position information of a surface of the object using a surface position detection system, wherein
the plurality of marks are detected, as a surface position of the object is controlled on the basis of the surface position information obtained and an offset value obtained beforehand.
18. The control method of the movable body according to claim 1 , further comprising:
performing calibration of the mark detection system using a reference index provided at the movable body.
19. The control method of the movable body according to claim 18 , further comprising:
placing the object onto the movable body, wherein
after the object has been placed onto the movable body, the performing the calibration is performed before the plurality of marks are detected.
20. The control method of the movable body according to claim 19 wherein
the performing the calibration is performed also after detection of the plurality of marks has been completed.
21. The control method of the movable body according to claim 18 , wherein
the performing the calibration is performed in the midst of detecting the plurality of marks.
22. An exposure method, comprising:
controlling the movable body on which an object provided with a plurality of marks is placed, with the control method of the movable body according to claim 1 ; and
forming a predetermined pattern on the object by irradiating the object with an energy beam, as controlling a position of the movable body within a two-dimensional plane that includes the first axis and the second axis on the basis of a detection result of the plurality of marks.
23. A device manufacturing method, comprising:
exposing a substrate using the exposure method according to claim 22 ; and
developing the substrate that has been exposed.
24. A movable body apparatus, comprising:
a movable body that is movable within a two-dimensional plane including a first axis and a second axis intersecting the first axis;
a mark detection system that scans a measurement beam in a direction of the first axis, with respect to a plurality of marks provided at an object placed on the movable body; and
a control system that performs detection of the marks using the mark detection system, as moving the movable body in the direction of the first axis, wherein
the control system detects a first mark of the plurality of marks, and also measures a positional relationship between the first mark and the measurement beam and adjusts a relative position between the measurement beam and the movable body in a direction of the second axis, on the basis of the positional relationship that has been measured.
25. The movable body apparatus according to claim 24 , wherein
the control system performs control of adjusting the relative position, and detecting a second mark, different from the first mark, of the plurality of marks while scanning the measurement beam in the direction of the first axis.
26. The movable body apparatus according to claim 25 , wherein
the second mark is a mark that is detected after detection of the first mark.
27. The movable body apparatus according to claim 26 , wherein
the control system estimates a center position of the second mark on the basis of a detection result of the first mark.
28. The movable body apparatus according to claim 27 , wherein
the control system compares the positional shift amount with a predetermined permissible value, and in a case where the positional shift amount is greater than the permissible value, detects the first mark again.
29. The movable body apparatus according to claim 25 , wherein
the control system obtains a positional shift amount between a center of the first mark and an irradiation position of the measurement beam, and when detecting the second mark, relatively moves the movable body and the measurement beam in a direction of cancelling out the positional shift, in accordance with the positional shift amount.
30. The movable body apparatus according to claim 29 , wherein
the control system estimates a center position of the second mark on the basis of a detection result of the first mark.
31. The movable body apparatus according to claim 29 , wherein
the control system compares the positional shift amount with a predetermined permissible value, and in a case where the positional shift amount is greater than the permissible value, detects the first mark again.
32. The movable body apparatus according to claim 24 , wherein
the first mark includes two or more marks,
the control system obtains the positional shift amount for each of the two or more marks, and performs adjustment of the relative position between the movable body and the measurement beam on the basis of the positional shift amount for each of the two or more marks.
33. The movable body apparatus according to claim 32 , wherein
a movement trajectory of the movable body is calculated on the basis of the positional shift amount for each of the two or more marks.
34. The movable body apparatus according to claim 32 , wherein
the control system performs the adjustment of the relative position between the movable body and the measurement beam, prior to detection of the first mark.
35. The movable body apparatus according to claim 24 , wherein:
the control system obtains positional information, within a two-dimensional plane that includes the first axis and the second axis, of the object on the movable body, and adjusts the relative position between the movable body and the measurement beam so that the mark detection system can detect at least the first mark.
36. The movable body apparatus according to claim 35 , wherein
the control system performs the adjustment of the relative position between the movable body and the measurement beam, in a case where the mark detection system cannot detect the first mark.
37. The movable body apparatus according to claim 24 , wherein
the control system moves the movable body along a predetermined movement course at a time of a detection operation of the first mark and the second mark, and
the first mark is a mark that can be detected first, of the plurality of marks, in a case where the movable body is moved along the movement course.
38. The movable body apparatus according to claim 24 , wherein
a velocity at which the movable body is moved when the measurement beam is irradiated on the first mark is slower than a velocity at which the movable body is moved when the measurement beam is irradiated on the second mark.
39. The movable body apparatus according to claim 38 , wherein
the velocity of the movable body is increased after the mark that can be detected first is detected.
40. The movable body apparatus according to claim 24 , further comprising:
a surface position detection system that obtains surface position information of a surface of the object, wherein
the control system performs control of detecting the plurality of marks as controlling a surface position of the object on the basis of the surface position information obtained and an offset value obtained beforehand.
41. The movable body apparatus according to claim 24 , wherein
the control system performs calibration of the mark detection system using a reference index provided at the movable body.
42. The movable body apparatus according to claim 41 , wherein
after the object is placed onto the movable body, the control system performs the calibration of the mark detection system before detecting the plurality of marks.
43. The movable body apparatus according to claim 42 , wherein
the control system performs the calibration of the mark detection system also after detection of the plurality of marks has been completed.
44. The movable body apparatus according to claim 41 , wherein
the control system performs the calibration of the mark detection system in the midst of detecting the plurality of marks.
45. An exposure apparatus, comprising:
the movable body apparatus according to claim 24 , in which an object provided with a plurality of marks is placed on the movable body; and
a pattern forming apparatus that forms a predetermined pattern on the object by irradiating the object placed on the movable body with an energy beam, a position of the movable body within the two-dimensional plane being controlled on the basis of a detection result of the plurality of marks.