PHOTOVOLTAIC CELL COMPRISING A THIN LAMINA HAVING EMITTER FORMED AT LIGHT-FACING AND BACK SURFACES
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United States of America Patent
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Issued Date -
Mar 31, 2011
app pub date -
Sep 29, 2009
filing date -
Sep 29, 2009
priority date (Note) -
Abandoned
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Abstract
A photovoltaic cell is described having emitter portions formed at both a light-facing surface and a back surface of the cell. In some embodiments, heavily doped emitter regions extend between the front and back emitter regions, connecting them electrically. Use of this structure is particularly well-adapted to a cell formed by implanting a semiconductor donor body with hydrogen and/or helium ions, affixing the donor body to a receiver element, cleaving a lamina from the donor body, and completing fabrication of a photovoltaic cell comprising the lamina. The emitter portion formed at the unbonded surface may comprise amorphous silicon. The lamina may be thin, for example 10 microns thick or less.
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