Fabricating photonics structure light signal transmission regions
View Patent ↗There is set forth herein a method including depositing a layer formed of barrier material over a conductive material formation of a photonics structure; and removing material of the layer in a light signal transmitting region of the photonics structure. In one embodiment the barrier material can include silicon carbon nitride. In one embodiment the barrier material can include silicon nitride.
1. A method comprising:
depositing a barrier layer that includes a first portion extending through a light signal transmitting region of a photonics structure, and a second portion formed on a conductive material formation, wherein the first portion extending through the light signal transmitting region is formed on a dielectric stack;
removing the first portion of the barrier layer formed on the dielectric stack to expose the dielectric stack within the light signal transmitting region;
depositing a layer of cladding dielectric material so that a portion of the layer of cladding dielectric material is formed on the barrier layer and a portion of the layer of cladding dielectric material is formed on the exposed portion of the dielectric stack formed within the light signal transmitting region; and
planarizing the layer of cladding dielectric material so that a top surface of the cladding dielectric material extends in a horizontal plane.
2. The method of claim 1 , wherein the method includes subsequent to the removing the first portion cleaning residual amounts of the barrier layer from the light signal transmitting region.
3. The method of claim 1 , wherein the method includes, prior to the depositing the barrier layer, planarizing the photonics structure to define a planar top surface of the photonics structure in an intermediary stage of fabrication so the planar top surface is partially defined by the dielectric stack and partially defined by the conductive material formation, wherein the depositing the barrier layer includes depositing the barrier layer on the planar top surface.
4. The method of claim 1 , wherein the light signal transmitting region of a photonics structure is defined between a first vertically extending plane and a spaced apart second vertically extending plane, and wherein the removing of the first portion of the barrier layer facilitates transmitting of a light signal within the light signal transmitting region through an elevation of the barrier layer.
5. The method of claim 1 , wherein the removing of the first portion of the barrier layer facilitates transmitting of a light signal within the light signal transmitting region through an elevation of the barrier layer.
6. The method of claim 1 , wherein the depositing of the barrier layer further includes a third portion formed on a second conductive material formation, the second conductive material formation being spaced apart from the conductive material formation and being at an elevation in common with the conductive material formation.
7. The method of claim 1 , wherein the conductive material formation is a conductive material formation defined by a metallization layer formed of copper (Cu).
8. The method of claim 1 , wherein the depositing the barrier layer includes depositing the barrier layer on a surface at a first elevation.
9. The method of claim 8 , further comprising fabricating within the dielectric stack a photonics device, the photonics device configured to transmit or receive a light signal through the first elevation.
10. The method of claim 8 , further comprising fabricating within the dielectric stack a photonics device that transmits or receives a light signal through the first elevation.
11. The method of claim 1 , wherein the method includes fabricating a photonics structure over the layer of cladding dielectric material.
12. The method of claim 1 , wherein the method includes fabricating a waveguide on the layer of cladding dielectric material, the fabricating including depositing waveguiding material on the layer of cladding dielectric material, patterning the waveguiding material to define a waveguide, and depositing oxide over the waveguide and planarizing the oxide.
13. The method of claim 1 , wherein the method includes, prior to the depositing the barrier layer, planarizing the photonics structure to define a planar top surface of the photonics structure in an intermediary stage of fabrication so the planar top surface is partially defined by the dielectric stack and partially defined by the conductive material formation.
14. The method of claim 1 , wherein the light signal transmitting region of a photonics structure is defined between a first vertically extending plane and a spaced apart second vertically extending plane.
15. The method of claim 1 , wherein the depositing of the barrier layer further includes a third portion formed on a second conductive material formation.
16. The method of claim 1 , wherein the conductive material formation is a conductive material formation defined by a metallization layer.
17. The method of claim 1 , further comprising fabricating within the dielectric stack a photonics device, the photonics device configured to transmit or receive a light signal.
18. The method of claim 1 , further comprising fabricating within the dielectric stack a photonics device that transmits or receives a light signal.
19. The method of claim 1 , further comprising fabricating within the dielectric stack a photonics device.
20. The method of claim 1 , wherein the method includes fabricating a waveguide on the layer of cladding dielectric material.