Method of processing a semiconductor wafer such as to make prototypes and related apparatus
A method of processing a semiconductor wafer may include providing a rotatably alignable photolithography mask that includes different mask images. Each mask image may be in a corresponding different mask sector. The method may also include performing a series of exposures with the rotatably alignable photolithography mask at different rotational alignments with respect to the semiconductor wafer so that the different mask images produce at least one working semiconductor wafer sector, and at least one non-working semiconductor wafer sector.
1. A method of processing a semiconductor wafer comprising:
providing a rotatably alignable photolithography mask comprising a plurality of different mask images, each mask image in a corresponding different mask sector; and
performing a series of exposures with the rotatably alignable photolithography mask at different rotational alignments with respect to the semiconductor wafer so that the different mask images produce corresponding stacked composite exposures for each of a plurality of semiconductor wafer sectors, the plurality of semiconductor wafer sectors comprising at least one working semiconductor wafer sector having an operational composite exposure order, and at least one non-working semiconductor wafer sector having a non-operational composite exposure order.
2. The method of claim 1 , wherein the plurality of different mask images comprises between two and four mask images.
3. The method of claim 1 , wherein the at least one working semiconductor wafer sector comprises a single working semiconductor wafer quadrant.
4. The method of claim 1 , wherein a next mask image is rotated 90-degrees relative to a preceding mask image.
5. The method of claim 1 , wherein the rotatably alignable photolithography mask comprises alignment indicia.
6. The method of claim 5 , wherein performing the series of exposures comprises performing the series of exposures with the rotatably alignable photolithography mask rotatably aligned based upon the alignment indicia.
7. The method of claim 1 , further comprising providing at least one other rotatably alignable photolithography mask and performing another series of exposures therewith.
8. The method of claim 1 , wherein the at least one working semiconductor sector comprises a plurality of working integrated circuits (ICs).
9. The method of claim 8 , wherein the plurality of working ICs comprise prototype ICs.
10. A method for making prototype integrated circuits (ICs) from a semiconductor wafer comprising:
providing a rotatably alignable photolithography mask comprising a plurality of different mask images, each mask image in a corresponding different mask sector; and
performing a series of exposures with the rotatably alignable photolithography mask at different rotational alignments with respect to the semiconductor wafer so that the different mask images produce corresponding stacked composite exposures for each of a plurality of semiconductor wafer sectors, the plurality of semiconductor wafer sectors comprising at least one prototype semiconductor wafer sector having an operational composite exposure order, and at least one non-prototype semiconductor wafer sector having a non-operational composite exposure order, with the at least one prototype semiconductor wafer sector comprising a plurality of prototype ICs.
11. The method of claim 10 , wherein the plurality of different mask images comprises between two and four mask images.
12. The method of claim 10 , wherein the at least one prototype semiconductor wafer sector comprises a prototype semiconductor wafer quadrant.
13. The method of claim 10 , wherein the rotatably alignable photolithography mask comprises alignment indicia; and wherein performing the series of exposures comprises performing the series of exposures with the rotatably alignable photolithography mask rotatably aligned based upon the alignment indicia.
14. The method of claim 10 , further comprising providing at least one other rotatably alignable photolithography mask and performing another series of exposures therewith.
15. A method of processing a semiconductor wafer comprising:
performing a series of exposures with a rotatably alignable photolithography mask at different rotational alignments with respect to the semiconductor wafer, the rotatably alignable photolithography mask comprising a plurality of different mask images with each mask image in a corresponding different mask sector so that the different mask images produce corresponding stacked composite exposures for each of a plurality of semiconductor wafer sectors, the plurality of semiconductor wafer sectors comprising at least one working semiconductor wafer sector having an operational composite exposure order, and at least one non-working semiconductor wafer sector having a non-operational composite exposure order.
16. The method of claim 15 , wherein the plurality of different mask images comprises between two and four mask images.
17. The method of claim 15 , wherein the at least one working semiconductor wafer sector comprises a working semiconductor wafer quadrant.
18. The method of claim 15 , wherein the rotatably alignable photolithography mask comprises alignment indicia; and wherein performing the series of exposures comprises performing the series of exposures with the rotatably alignable photolithography mask rotatably aligned based upon the alignment indicia.
19. The method of claim 15 , further comprising providing at least one other rotatably alignable photolithography mask and performing another series of exposures therewith.
20. The method of claim 15 , wherein the at least one working semiconductor sector comprises a plurality of working integrated circuits (ICs).