Integrated method and system for manufacturing monolithic panels of crystalline solar cells
An anodic etching system for simultaneously etching a multiplicity of substrates comprises: an etching tank for containing therein an etchant solution; a power supply connected between a first electrode and a second electrode, the first electrode and the second electrode being immersible in the etchant solution and positioned at opposite ends of the tank; and a plurality of support plates serially arranged between the first electrode and the second electrode and sealed to walls of the tank, wherein each of the plurality of support plates is configured to support at least one of the multiplicity of substrates, and wherein any consecutive pair of the plurality of support plates defines an isolated volume of the tank for containing a portion of the etchant solution. The plurality of support plates may be susceptors configured for holding the multiplicity of substrates in a chemical vapor deposition tool.
1. An anodic etching system for simultaneously etching a multiplicity of substrates, comprising:
an etching tank for containing therein an etchant solution;
a power supply connected between a first electrode and a second electrode, said first electrode and said second electrode being immersible in said etchant solution and positioned at opposite ends of said tank; and
a plurality of support plates serially arranged between said first electrode and said second electrode and sealed to walls of said tank, wherein each of said plurality of support plates is configured to support at least one of said multiplicity of substrates, and wherein any consecutive pair of said plurality of support plates defines an isolated volume of said tank for containing a portion of said etchant solution;
wherein at least two substrates having coplanar surface planes are attached to the surface of one of said plurality of support plates, said coplanar surface planes being parallel to the surface of said one of said plurality of support plates and said at least two substrates being separated by a gap, said surface of said one of said plurality of support plates being exposed by said gap.
2. The system of claim 1 , wherein said plurality of support plates have a multiplicity of apertures therethrough and said multiplicity of substrates cover corresponding ones of said multiplicity of apertures and wherein said plurality of support plates and said multiplicity of substrates are configured to provide a fluid-tight seal dividing said etching tank into said isolated volumes.
3. The system of claim 2 , wherein a portion of the back surface of each of said multiplicity of substrates is exposed to said etchant solution through said corresponding ones of said multiplicity of apertures.
4. The system of claim 3 , wherein said multiplicity of apertures are square apertures.
5. The system of claim 3 , wherein said multiplicity of apertures are slots.
6. The system of claim 1 , wherein said multiplicity of substrates are silicon wafers.
7. The system of claim 1 , wherein said multiplicity of substrates are configured on said plurality of support plates to expose the entire front surfaces of said multiplicity of substrates to said etchant solution.
8. The system of claim 7 , wherein the edge surfaces of said multiplicity of substrates are exposed to said etchant solution.
9. The system of claim 1 , wherein said power supply is a DC power supply.
10. The system of claim 1 , wherein said plurality of support plates are electrically conductive plates.
11. The system of claim 1 , wherein said at least two substrates comprise three or more substrates arranged in a two dimensional array.
12. The system of claim 1 , wherein said plurality of support plates are insulating.
13. The system of claim 1 , wherein said plurality of support plates are susceptors configured for holding said multiplicity of substrates in a chemical vapor deposition tool.
14. The system of claim 13 , wherein said susceptors are silicon carbide susceptors.
15. The system of claim 13 , wherein said susceptors are ceramic susceptors.
16. The system of claim 1 , further comprising mechanical clamps, said mechanical clamps being configured to hold said multiplicity of substrates to the surfaces of corresponding support plates of said plurality of support plates.
17. The system of claim 10 , further comprising a bond layer between each of said multiplicity of substrates and said corresponding one of said plurality of support plates, said multiplicity of substrates being bonded to said plurality of support plates to form low resistance contacts between each of said multiplicity of substrates and the corresponding one of said plurality of support plates.