PHOTOVOLTAIC MONOLITHIC SOLAR MODULE CONNECTION AND FABRICATION METHODS
Solar cell array solutions including monolithic solar cell arrays and fabrication methods. A first patterned cell metallization contacts base and emitter regions of each of a plurality of solar cells having a light receiving frontside and a backside. An electrically insulating continuous backplane layer is attached to the backside of the solar cells and covers the first cell metallization of each of the solar cells. Via holes through the continuous backplane layer provide access to the first cell metallization. A second cell metallization is connected to the first cell metallization of each of the solar cells and electrically interconnects the solar cells in the array.
1 . A photovoltaic module, comprising:
a plurality of back-contact solar cells, each of said solar cells having at least:
a light receiving frontside and a backside;
a first patterned cell metallization on said backside contacting base regions and emitter regions of said back-contact solar cell;
an electrically insulating continuous backplane layer attached to said backsides of said plurality of back-contact solar cells and covering said first patterned cell metallization of each of said back-contact solar cells;
via holes through said continuous backplane layer to said first patterned cell metallization;
a second patterned cell metallization interconnected to said first patterned cell metallization of each of said back-contact solar cells and electrically interconnecting said plurality of back-contact solar cells in said array, said second patterned cell metallization comprising at least a positive electrical bussing connector and a corresponding peripheral positive module electrical lead and at least a negative electrical bussing connector and a corresponding peripheral negative module electrical lead.
2 . The photovoltaic module of claim 1 , wherein said plurality of back-contact solar cells is a plurality of interdigitated back contact (IBC) solar cells.
3 . The photovoltaic module of claim 2 , wherein said plurality of interdigitated back contact solar cells are interdigitated back contact heterojunction solar cells.
4 . The photovoltaic solar cell module of claim 1 , wherein said second patterned cell metallization comprises copper.
4 B. (canceled)
5 . The photovoltaic module of claim 1 , wherein said peripheral module leads are snap-on connectors.
6 . The photovoltaic module of claim 1 , wherein said continuous backplane layer is a prepreg sheet.
7 . The photovoltaic module of claim 6 , wherein said continuous prepreg sheet is an aramid fiber resin based prepreg sheet.
8 . The photovoltaic module of claim 6 , wherein said continuous prepreg sheet has a thickness less than approximately 250 micrometers.
9 . The photovoltaic module of claim 1 , wherein said back-contact solar cells comprise semiconductor absorbers having a thickness less than approximately 100 micrometers.
10 . The photovoltaic module of claim 1 , wherein second patterned cell metallization electrically connects said plurality of back-contact solar cells in an all-series connection.
11 . The photovoltaic module of claim 1 , wherein second patterned cell metallization electrically connects said plurality of back-contact solar cells in a hybrid parallel-series connection.
12 . The photovoltaic module of claim 1 , wherein said continuous backplane layer forms a peripheral handle perimeter around said plurality of solar cells.
13 . A method for fabricating a photovoltaic solar cell array, comprising:
laminating a continuous backplane to the backside of a plurality of back-contact solar cells, each of said solar cells comprising a first-level patterned base and emitter metallization;
forming vias through said continuous backplane to said first-level patterned base and emitter metallization on the backside of each of said plurality of back-contact solar cells;
forming a second level patterned metal (M2) on said continuous backplane, said second level patterned metal M2 contacting said first-level patterned base and emitter metallization through said vias in said continuous backplane; and
patterning said second-level metal M2 into a base and emitter metallization pattern interconnecting to said first-level patterned base and emitter metallization on the backside of each of said plurality of back-contact solar cells, an interconnection pattern electrically connecting said plurality of solar cells in said array, at least a positive electrical bussing connector and a corresponding peripheral positive module electrical lead, and at least a negative electrical bussing connector and a corresponding peripheral negative module electrical lead.
14 . The method for fabricating a photovoltaic solar cell array of claim 13 , wherein said via holes are formed by laser drilling.
15 . The method for fabricating a photovoltaic solar cell array of claim 13 , wherein said formation of a second-level metal M2 on said continuous backplane forms electrically conductive via plugs in said vias.
16 . The method for fabricating a photovoltaic solar cell array of claim 13 , further comprising the step of at least partially filling said vias with an electrically conductive material prior to or after formation of said second-level metal M2.
17 . The method for fabricating a photovoltaic solar cell array of claim 13 , further comprising solar cell frontside processing after said lamination of a continuous backplane.
18 . The method for fabricating a photovoltaic solar cell array of claim 17 , wherein said solar cell frontside processing comprises a solar cell thinning etch.
19 . The method for fabricating a photovoltaic solar cell array of claim 17 , wherein said solar cell frontside processing comprises a solar cell texturization etch.
20 . The method for fabricating a photovoltaic solar cell array of claim 17 , wherein said solar cell frontside processing comprises frontside passivation layer deposition by Plasma-Enhanced Chemical-Vapor Deposition (PECVD).
21 . The photovoltaic module of claim 1 , wherein said second patterned cell metallization comprises aluminum.