SUNPREME, LTD. Patent applications |
Patent application number | Title | Published |
20160111589 | LOW-COST SOLAR CELL METALLIZATION OVER TCO AND METHODS OF THEIR FABRICATION - Methods for fabricating busbar and finger metallization over TCO are disclosed. Rather than using expensive and relatively resistive silver paste, a high conductivity and relatively low cost copper is used. Methods for enabling the use of copper as busbar and fingers over a TCO are disclosed, providing good adhesion while preventing migration of the copper into the TCO. Also, provisions are made for easy soldering contacts to the copper busbars. | 04-21-2016 |
20130252427 | METHOD FOR CLEANING TEXTURED SILICON WAFERS - Substrates for solar cells are prepared by the reverse of the standard RCA clean. The substrates are first cleaned in RCA-2 solution and then in RCA-1 solution. A pyramids rounding step using HF/HNO | 09-26-2013 |
20130125968 | LOW-COST SOLAR CELL METALLIZATION OVER TCO AND METHODS OF THEIR FABRICATION - Methods for fabricating busbar and finger metallization over TCO are disclosed. Rather than using expensive and relatively resistive silver paste, a high conductivity and relatively low cost copper is used. Methods for enabling the use of copper as busbar and fingers over a TCO are disclosed, providing good adhesion while preventing migration of the copper into the TCO. Also, provisions are made for easy soldering contacts to the copper busbars. | 05-23-2013 |
20110223708 | LOW-COST MULTI-JUNCTION SOLAR CELLS AND METHODS FOR THEIR PRODUCTION - Methods for fabricating solar cells without the need to perform gasification of metallurgical-grade silicon are disclosed. Consequently, the costs and health and environmental hazards involved in fabricating the solar or silicon grade silicon are being avoided. A solar cell structure comprises a metallurgical grade doped silicon substrate and a thin-film structure formed over the substrate to form a p-i-n junction with the substrate. The substrate may be doped p-type, and the thin film structure may be an intrinsic amorphous layer formed over the substrate and an n-type amorphous layer formed over the intrinsic layer. | 09-15-2011 |
20110220201 | LOW-COST MULTI-JUNCTION SOLAR CELLS AND METHODS FOR THEIR PRODUCTION - Solar cells fabricated without gasification of metallurgical-grade silicon. The substrates are prepared by: melting metallurgical grade silicon in a furnace; solidifying the melted metallurgical grade silicon into an ingot; slicing the ingot to obtain a plurality of wafers; polishing and cleaning each wafer; depositing aluminum layer on backside of each wafer; depositing a layer of hydrogenated silicon nitride on front surface of each wafer; annealing the wafers at elevated temperature; removing the hydrogenated silicon nitride; and, removing the aluminum layer. The front surface may be textured prior to forming the solar cell. The solar cell structure comprises a metallurgical grade doped silicon substrate and a thin-film structure formed over the substrate to form a p-i-n junction with the substrate. The substrate may be doped p-type, and the thin film structure may be an intrinsic amorphous layer formed over the substrate and an n-type amorphous layer formed over the intrinsic layer. | 09-15-2011 |
20110207259 | LOW-COST SOLAR CELLS AND METHODS FOR THEIR PRODUCTION - Methods for fabricating solar cells without the need to perform gasification of metallurgical-grade silicon are disclosed. Consequently, the costs and health and environmental hazards involved in fabricating the solar or silicon grade silicon are being avoided. A solar cell structure comprises a metallurgical grade doped silicon substrate and a thin-film structure formed over the substrate to form a p-i-n junction with the substrate. The substrate may be doped p-type, and the thin film structure may be an intrinsic amorphous layer formed over the substrate and an n-type amorphous layer formed over the intrinsic layer. | 08-25-2011 |
20100317146 | LOW-COST SOLAR CELLS AND METHODS FOR FABRICATING LOW COST SUBSTRATES FOR SOLAR CELLS - Substrates for solar cells are prepared by etching a plurality of metallurgical grade wafers; depositing aluminum layer on backside of each wafer; depositing a layer of hydrogenated silicon nitride on front surface of each wafer; annealing the wafers at elevated temperature; removing the hydrogenated silicon nitride without disturbing the aluminum layer. A solar cell is then fabricated on the front surface of the wafer while the aluminum remain to serve as the back contact of the cell. | 12-16-2010 |
20100116335 | LOW-COST MULTI-JUNCTION SOLAR CELLS AND METHODS FOR THEIR PRODUCTION - Solar cells fabricated without gasification of metallurgical-grade silicon. The substrates are prepared by: melting metallurgical grade silicon in a furnace; solidifying the melted metallurgical grade silicon into an ingot; slicing the ingot to obtain a plurality of wafers; polishing and cleaning each wafer; depositing aluminum layer on backside of each wafer; depositing a layer of hydrogenated silicon nitride on front surface of each wafer; annealing the wafers at elevated temperature; removing the hydrogenated silicon nitride; and, removing the aluminum layer. The front surface may be textured prior to forming the solar cell. The solar cell structure comprises a metallurgical grade doped silicon substrate and a thin-film structure formed over the substrate to form a p-i-n junction with the substrate. The substrate may be doped p-type, and the thin film structure may be an intrinsic amorphous layer formed over the substrate and an n-type amorphous layer formed over the intrinsic layer. | 05-13-2010 |