Abstract:
Fabrication methods and structures relating to multi-level metallization of solar cells are described. In one embodiment, a back contact solar cell comprises a substrate having a substrate having a light receiving frontside surface and a backside surface for forming patterned emitter and non-nested base regions. Interdigitated doped emitter and base regions are formed on a backside surface of a crystalline semiconductor substrate. A patterned electrically insulating layer stack comprising a combination of at least a doped layer and an undoped capping layer is formed on the patterned doped emitter and base regions. A contact metallization pattern is formed comprising emitter metallization electrodes contacting the emitter regions and non-nested base metallization electrodes contacting the base regions wherein the non-nested base metallization electrodes are allowed to go beyond the base regions to overlap at least a portion of said patterned insulator without causing electrical shunts in the solar cell.
Abstract:
Fabrication methods and structures relating to multi-level metallization of solar cells are described. In one embodiment, a back contact solar cell comprises a substrate having a substrate having a light receiving frontside surface and a backside surface for forming patterned emitter 5 and non-nested base regions. Interdigitated doped emitter and base regions are formed on a backside surface of a crystalline semiconductor substrate. A patterned electrically insulating layer stack comprising a combination of at least a doped layer and an undoped capping layer is formed on the patterned doped emitter and base regions. A contact metallization pattern is formed comprising emitter metallization electrodes contacting the emitter regions and non 10 nested base metallization electrodes contacting the base regions wherein the non-nested base metallization electrodes are allowed to go beyond the base regions to overlap at least a portion of said patterned insulator without causing electrical shunts in the solar cell.
Abstract:
Fabrication methods and structures relating to multi-level metallization of solar cells are described. In one embodiment, a back contact solar cell comprises a substrate having a substrate having a light receiving frontside surface and a backside surface for forming patterned emitter 5 and non-nested base regions. Interdigitated doped emitter and base regions are formed on a backside surface of a crystalline semiconductor substrate. A patterned electrically insulating layer stack comprising a combination of at least a doped layer and an undoped capping layer is formed on the patterned doped emitter and base regions. A contact metallization pattern is formed comprising emitter metallization electrodes contacting the emitter regions and non 10 nested base metallization electrodes contacting the base regions wherein the non-nested base metallization electrodes are allowed to go beyond the base regions to overlap at least a portion of said patterned insulator without causing electrical shunts in the solar cell.
Abstract:
Fabrication methods and structures relating to multi-level metallization of solar cells are described. In one embodiment, a back contact solar cell comprises a substrate having a substrate having a light receiving frontside surface and a backside surface for forming patterned emitter and non-nested base regions. Interdigitated doped emitter and base regions are formed on a backside surface of a crystalline semiconductor substrate. A patterned electrically insulating layer stack comprising a combination of at least a doped layer and an undoped capping layer is formed on the patterned doped emitter and base regions. A contact metallization pattern is formed comprising emitter metallization electrodes contacting the emitter regions and non-nested base metallization electrodes contacting the base regions wherein the non-nested base metallization electrodes are allowed to go beyond the base regions to overlap at least a portion of said patterned insulator without causing electrical shunts in the solar cell.
Abstract:
Annealing solutions providing damage-free laser patterning utilizing auxiliary heating to anneal laser damaged ablation regions are provided herein. Ablation spots on an underlying semiconductor substrate are annealed during or after pulsed laser ablation patterning of overlying transparent passivation layers.