Method for III-V/silicon hybrid integration
A method of transfer printing. The method comprising: providing a precursor photonic device, comprising a substrate and a bonding region, wherein the precursor photonic device includes one or more alignment marks located in or adjacent to the bonding region; providing a transfer die, said transfer die including one or more alignment marks; aligning the one or more alignment marks of the precursor photonic device with the one or more alignment marks of the transfer die; and bonding at least a part of the transfer die to the bonding region.
1. An optoelectronic device comprising:
a precursor photonic device, comprising:
a substrate,
a bonding region, for receiving and bonding to a transfer die,
one or more alignment marks; and
one or more metal patches covering the respective alignment marks,
wherein a first alignment mark of the one or more alignment marks is at least partially defined by a first trench, and a first metal patch of the one or more metal patches respective to the first alignment mark covers a region adjacent to the first alignment mark.
2. The optoelectronic device of claim 1 , wherein the bonding region is in a cavity in the substrate.
3. The optoelectronic device of claim 1 , further comprising an input waveguide, wherein the alignment marks are configured to align a photonic device, located on the transfer die, relative to the input waveguide.
4. The optoelectronic device of claim 1 , wherein the one or more alignment marks allow for alignment in at least two non-parallel directions.
5. The optoelectronic device of claim 1 , wherein the one or more alignment marks are provided as one or more etched regions and/or as one or more patterned metal surfaces.
6. The optoelectronic device of claim 1 , including one or more coarse alignment marks, and one or more fine alignment marks.
7. The optoelectronic device of claim 6 , wherein the one or more coarse alignment marks are shaped as any one or more of: an arrow, a cross, a T shape, and an L shape.
8. The optoelectronic device of claim 1 , wherein the one or more alignment marks include Vernier patterns.
9. The optoelectronic device of claim 1 , wherein the precursor photonic device is a silicon-on-insulator wafer, including either or both of an input waveguide and an output waveguide, each adjacent to the bonding region.
10. The optoelectronic device of claim 1 , further comprising a transfer die comprising a photonic device, said photonic device having a bonding surface bonded to the bonding region of the precursor photonic device,
wherein the transfer die includes one or more alignment marks.
11. The optoelectronic device of claim 10 , wherein the photonic device is a III-V semiconductor device.
12. The optoelectronic device of claim 10 , wherein the photonic device is a laser, semiconductor optical amplifier, or an electro-absorption modulator.
13. The optoelectronic device of claim 12 , wherein the photonic device is an electro-absorption modulator, wherein said electro-absorption modulator comprises an input waveguide and an output waveguide, and wherein both of said input waveguide and said output waveguide comprise a port located on a same side of the transfer die.
14. The optoelectronic device of claim 10 , wherein the precursor photonic device includes a first waveguide and the transfer die includes a second waveguide, and, once bonded, an interface between the first waveguide and the second waveguide is angled relative to a guiding direction of the first waveguide or second waveguide.
15. The optoelectronic device of claim 10 , wherein the one or more alignment marks of the precursor photonic device include one or more alignment marks located adjacent to the bonding region, and once bonded, a closest distance between one of the one or more alignment marks adjacent to the bonding region and a corresponding one of the one or more alignment marks included in the transfer die is at least 50 μm and no more than 1000 μm.
16. The optoelectronic device of claim 10 , wherein the or each alignment mark located in or adjacent to the bonding region is symmetrical as compared to a corresponding alignment mark included in the transfer die.
17. The optoelectronic device of claim 10 , wherein the transfer die includes one or more metal patches covering the respective alignment marks of the transfer die.
18. The optoelectronic device of claim 17 , wherein the transfer die includes a second trench etched to surround a second alignment mark of the one or more alignment marks of the transfer die and a second metal patch of the one or more metal patches of the transfer die, and
wherein the second metal patch covers a bottom surface of the second trench.
19. The optoelectronic device of claim 10 , wherein:
the precursor photonic device includes a first waveguide;
the transfer die includes a second waveguide; and
the first waveguide, the second waveguide, or both, include a T-bar facet.
20. The optoelectronic device of claim 10 , wherein at least one of the one or more alignment marks of the precursor photonic device or at least one of the one or more alignment marks of the transfer die, or both, are formed in one of the following shapes: a rectangle, a square, an L-shape, a circle, a ring, a partial circle, and a partial ring.
21. The optoelectronic device of claim 1 , wherein the first metal patch covers a bottom surface of the first trench.
22. The optoelectronic device of claim 1 , wherein the first trench surrounds the first alignment mark.
23. An optoelectronic device comprising:
a precursor photonic device, comprising:
a substrate,
a bonding region, for receiving and bonding to a transfer die,
one or more alignment marks, and
one or more metal patches covering the respective alignment marks; and
a transfer die comprising a photonic device, said photonic device having a bonding surface bonded to the bonding region of the precursor photonic device,
wherein the photonic device is an electro-absorption modulator, wherein said electro-absorption modulator comprises an input waveguide and an output waveguide, and wherein both of said input waveguide and said output waveguide comprise a port located on a same side of the transfer die.
24. An optoelectronic device comprising:
a precursor photonic device, comprising:
a substrate,
a bonding region, for receiving and bonding to a transfer die,
one or more alignment marks, and
one or more metal patches covering the respective alignment marks; and
a transfer die comprising a photonic device, said photonic device having a bonding surface bonded to the bonding region of the precursor photonic device,
wherein the precursor photonic device includes a first waveguide and the transfer die includes a second waveguide, and, once bonded, an interface between the first waveguide and the second waveguide is angled relative to a guiding direction of the first waveguide or second waveguide.
25. An optoelectronic device comprising:
a precursor photonic device, comprising:
a substrate,
a bonding region, for receiving and bonding to a transfer die,
one or more alignment marks, and
one or more metal patches covering the respective alignment marks; and
a transfer die comprising a photonic device, said photonic device having a bonding surface bonded to the bonding region of the precursor photonic device,
wherein:
the precursor photonic device includes a first waveguide;
the transfer die includes a second waveguide; and
the first waveguide, the second waveguide, or both, include a T-bar facet.