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Photovoltaic cells for converting light energy to electric energy and photoelectric battery
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Inventors: Rubin, Leoind B.; Osipov, Alexandr S.; Sizganov, Jury G.; Untila, Gennady G.; Kharitonov, Andrei L.; Rakhimov, Alexandr T.;
Assignee: BioPhotonics, Inc. ()
Primary Examiner: Weisstuch; Aaron
Assistant Examiner:
Attorney, Agent or Firm: Dominik, Stein, Saccocio, Reese, Colitz & VanDerWall
A solar photovoltaic cell with a conductive current collecting contacts embedded in a block of optical transparent polymer material between the semiconductor wafer and protective cover in such a manner that at least the section thereof which are in contact with the surface of the semiconductor wafer protrude from the polymer block. This provides for a reliable ohmic contact between the current collecting contacts and the semiconductor wafer. The disclosed geometry of the solar cell reduces the shadowing area of the semiconductor wafer by up to 90%. |
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DETAILED DESCRIPTION It is a principal object of the present invention to reduce the shadowing area of the semiconductor wafer surface caused by the current collecting contacts and, thus, to enhance the efficiency of the photovoltaic cell for converting solar energy to electric energy.
It is a further object of the invention to provide novel current collecting contacts simplifying the interconnection of both the photovoltaic cells themselves and batteries assembled therefrom, in result of which the above mentioned technique of interconnecting the contacts and the buses by soldering can be abandoned.
This will permit automation of the fabrication of photovoltaic cells and of batteries assembled therefrom as well as significantly simplify the fabrication process as a whole and reduce costs.
BRIEF DESCRIPTION OF THE INVENTION The present invention provides a photovoltaic cell for converting light energy to electric energy, wherein a conductive current collecting element (contact) is provided at least on the front surface of the semiconductor wafer, said current collecting contact comprising electrically connected intermittent sections being, respectively, in and out of contact with the semiconductor wafer surface.
Since part of the current collecting contact is "elevated" above the semiconductor wafer surface and this surface is, therefore, additionally exposed to dissipated solar energy, the overall conversion efficiency of the photovoltaic cell is enhanced.
If the photovoltaic cell has an isotype junction on the rear side of the semiconductor wafer, and the thickness of the semiconductor wafer is comparable to the diffusion length of minor charge carriers, then illumination, e.
g.
by solar radiation dissipated in the atmosphere, of the rear side of the photovoltaic cell on which also current collecting contacts in accordance with the present invention are arranged, will lead to a further enhanced conversion efficiency.
The construction and the interconnection of the conductive contacts are significantly facilitated, if such a current collecting contact is arranged on both sides of the semiconductor wafer
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