REAR-CONTACT SOLAR CELL HAVING EXTENSIVE REAR SIDE EMITTER REGIONS AND METHOD FOR PRODUCING THE SAME
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United States of America Patent
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Issued Date -
Feb 3, 2011
app pub date -
Nov 28, 2008
filing date -
Dec 11, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a rear-contact solar cell and to a method for producing the same. The rear-contact solar cell comprises a semiconductor substrate on the rear side surface of which emitter regions, contacted by emitter contacts, and base regions, contacted by base contacts, are defined. The emitter regions and the base regions overlap at least in overlap regions, the emitter regions in the overlap regions reaching deeper into the semiconductor substrate than the base regions, when seen from the rear side surface of the solar cell. As a result, a large area percentage of the rear side of the semiconductor substrate can be covered with a charge-collecting emitter, said emitter being at least partially buried in the interior of the semiconductor substrate so that there is no risk of the base contacts provoking a short circuit towards the buried emitter regions.
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