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Method-of-making-a-back-contacted-solar-cell

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Method of making a back contacted solar cell

Details

Inventors: Gee, James M.;
Assignee: Sandia Corporation (Albuquerque, NM)
Primary Examiner: Weisstuch; Aaron
Assistant Examiner:
Attorney, Agent or Firm: Cone; Gregory A.

A back-contacted solar cell having laser-drilled vias connecting the front-surface carrier-collector junction to an electrode grid on the back surface. The structure may also include a rear surface carrier-collector junction connected to the same grid. The substrate is connected to a second grid which is interdigitated with the first. Both grids are configured for easy series connection with neighboring cells. Several processes are disclosed to produce the cell.

DETAILED DESCRIPTION A very efficient and readily manufacturable solar cell with a front carrier-collection junction can be produced with both negative and positive current-collection grids located on the back side of the device.
The invention uses laser-drilled vias to conduct current from the front surface carrier-collection junction to a grid on the back surface.
These vias are treated for high conductivity and to electrically isolate the via from the bulk semiconductor.
The vias are connected on the back side to one of the current-collection grids.
The other (opposite polarity) grid is connected to the bulk semiconductor with doping opposite to that of the collection junction on the front surface.
The two grids are interdigitated and optimized to minimize electrical resistance and carrier recombination.

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