Method and device for alignment of substrates

1. A method for aligning and contacting a first contact face of a first substrate with a second contact face of a second substrate, the method comprising:

providing a first substrate having a first contact face and a first support face, and a second substrate having a second contact face and a second support face,

fixing the first support face of the first substrate on a first substrate holder and the second support face of the second substrate on a second substrate holder, said second substrate holder arranged opposite the first substrate holder,

detecting a first X-Y position and/or a first alignment orientation of a first alignment marking,

detecting a second X-Y position and/or a second alignment orientation of a second alignment marking,

aligning the first substrate with respect to the second substrate, and

contacting the first substrate with the second substrate, said first substrate being aligned with respect to the second substrate,

wherein, before aligning the first substrate with respect to the second substrate, detecting a third X-Y position and/or a third alignment orientation of a third alignment marking arranged on the first substrate holder and/or the first substrate by use of a third detection unit, by means of which the aligning the first substrate with respect to the second substrate is controlled, wherein (i) the first alignment marking and the third alignment marking are respectively arranged on opposite sides of the first substrate or (ii) the first alignment marking is arranged on a side of the first substrate facing away from the first substrate holder and the third alignment marking is arranged on a side of the first substrate holder facing away from the first substrate.

2. The method according to claim 1 , wherein the detecting of the first alignment marking and of the third alignment marking takes place simultaneously.

3. The method according to claim 1 , wherein the second substrate holder is fixed at least in the X-Y direction during the aligning of the first substrate with respect to the second substrate.

4. The method according to claim 1 , wherein a first detection unit is used for the detecting of the first X-Y position and/or the first alignment orientation of said first alignment marking and a second detection unit is used for the detecting of the second X-Y position and/or the second alignment orientation of said second alignment marking, the first detection unit and the second detection unit are provided on a common X-Y positioning device and/or optical axes of the first detection unit and of the second detection unit are aligned with or assigned to one another, having a common optical axis.

5. The method according to claim 4 , wherein the third detection unit is arranged fixedly in the X- and Y-direction at least with respect to the first detection unit with respect to an optical system comprising the first detection unit and the second detection unit, during the detecting at least until the aligning of the first substrate with respect to the second substrate.

6. The method according to claim 1 , wherein the control of the aligning of the first substrate with respect to the second substrate takes place exclusively by means of the detecting of the third X-Y position and/or the third alignment orientation of said third alignment marking.

7. The method according to claim 1 , wherein the first substrate and the second substrate are arranged between the first substrate holder and the second substrate holder with a constant spacing A between the first contact face and the second contact face in a Z-direction during the detecting of the first and second X-Y positions and until the aligning of the first substrate with respect to the second substrate.

8. The method according to claim 7 , wherein the spacing A is less than 500 microns.

9. A device for aligning and contacting a first contact face of a first substrate with a second contact face of a second substrate, said device comprising:

a first substrate holder for fixing a first support face of the first substrate,

a second substrate holder for fixing a second support face of the second substrate, said second substrate holder arrangeable opposite the first substrate holder,

a first detection unit for detecting a first X-Y position and/or a first alignment orientation of a first alignment marking,

a second detection unit for detecting a second X-Y position and/or a second alignment orientation of a second alignment marking,

alignment means for aligning the first substrate with respect to the second substrate,

contacting means for contacting the first substrate with the second substrate, said first substrate being aligned with respect to the second substrate, and

a third detection unit for detecting a third X-Y position and/or a third alignment orientation of a third alignment marking arranged on the first substrate holder and/or the first substrate, by means of which the aligning of the first substrate with respect to the second substrate is controlled,

wherein (i) the first alignment marking and the third alignment marking are respectively arranged on opposite sides of the first substrate or (ii) the first alignment marking is arranged on a side of the first substrate facing away from the first substrate holder and the third alignment marking is arranged on a side of the first substrate holder facing away from the first substrate.

10. The device according to claim 9 , wherein the first detection unit and the third detection unit are synchronised.

11. The device according to claim 9 , wherein the second substrate holder is fixed at least in the X-Y direction during the aligning of the first substrate with respect to the second substrate.

12. The device according to claim 9 , wherein the first detection unit and the second detection unit are provided on a common X-Y positioning device and/or optical axes of the first detection unit and of the second detection unit are aligned with and assigned to one another, having a common optical axis.

13. The device according to claim 9 , wherein the third detection unit is arranged fixedly in the X- and Y-direction, at least with respect to the first detection unit, with respect to an optical system comprising the first detection unit and the second detection unit, during the detecting the third X-Y position and/or the third alignment orientation of said third alignment marking, at least until the aligning of the first substrate with respect to the second substrate.

14. The method according to claim 1 , wherein the first X-Y position is related to a focal plane of a first detection unit.

15. The method according to claim 1 , wherein the first alignment marking is arranged in a peripheral region of the first substrate.

16. The method according to claim 1 , wherein the second X-Y position is related to a focal plane of a second detection unit.

17. The method according to claim 1 , wherein the second alignment marking is arranged in a peripheral region of the second substrate.

18. The method according to claim 4 , wherein the first detection unit and the third detection unit are synchronized.