DOPING PATTERN FOR POINT CONTACT SOLAR CELLS
First Claim
1. A method of creating a point contact solar cell, comprising:
- providing a substrate having a first conductivity;
performing a blanket implant on a surface of said substrate with a species of a second conductivity, said second conductivity being opposite said first conductivity, so as to create a base of said first conductivity and an emitter of said second conductivity;
performing a patterned implant of said surface of said substrate using a species of said first conductivity to create discrete counterdoped regions of said first conductivity on said surface, wherein said counterdoped regions are electrically connected to said base; and
performing a second patterned implant of said surface of said substrate using a species of said second conductivity to create highly doped emitter regions.
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Abstract
Methods of doping a solar cell, particularly a point contact solar cell, are disclosed. One surface of a solar cell may require portions to be n-doped, while other portions are p-doped. At least one lithography step can be eliminated by the use of a blanket doping of species having one conductivity and a patterned counterdoping process of species having the opposite conductivity. The areas doped during the patterned implant receive a sufficient dose so as to completely reverse the effect of the blanket doping and achieve a conductivity that is opposite the blanket doping. In some embodiments, counterdoped lines are also used to reduce lateral series resistance of the majority carriers.
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Citations
18 Claims
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1. A method of creating a point contact solar cell, comprising:
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providing a substrate having a first conductivity; performing a blanket implant on a surface of said substrate with a species of a second conductivity, said second conductivity being opposite said first conductivity, so as to create a base of said first conductivity and an emitter of said second conductivity; performing a patterned implant of said surface of said substrate using a species of said first conductivity to create discrete counterdoped regions of said first conductivity on said surface, wherein said counterdoped regions are electrically connected to said base; and performing a second patterned implant of said surface of said substrate using a species of said second conductivity to create highly doped emitter regions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A point contact solar cell, comprising:
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an illuminated surface; a non-illuminated surface; a n-type base located between said illuminated surface and said non-illuminated surface; wherein said non-illuminated surface is p-doped to form an emitter and comprises; a plurality of discrete counterdoped n-type regions in electrical contact with said base; and a plurality of counterdoped n-type lines connecting said discrete counterdoped n-type regions. - View Dependent Claims (9, 10, 11, 12)
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13. A method of creating a point contact solar cell, comprising:
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providing a substrate having a first conductivity; performing a blanket implant on a surface of said substrate with a species of a second conductivity, said second conductivity being opposite said first conductivity, so as to create a base of said first conductivity and an emitter of said second conductivity; performing a patterned implant of said surface of said substrate using a species of said first conductivity so as to counterdope regions on said surface so as to create discrete counterdoped dots of said first conductivity on said surface, wherein said counterdoped dots are electrically connected to said base. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification