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Low resistance thin film organic solar cell electrodes

United States Patent Application

20080131993
A1
View the Complete Application at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A method which lower the series resistance of photosensitive devices includes providing a transparent film of a first electrically conductive material arranged on a transparent substrate; depositing and patterning a mask over the first electrically conductive material, such that openings in the mask have sloping sides which narrow approaching the substrate; depositing a second electrically conductive material directly onto the first electrically conductive material exposed in the openings of the mask, at least partially filling the openings; stripping the mask, leaving behind reentrant structures of the second electrically conductive material which were formed by the deposits in the openings of the mask; after stripping the mask, depositing a first organic material onto the first electrically conductive material in between the reentrant structures; and directionally depositing a third electrically conductive material over the first organic material deposited in between the reentrant structures, edges of the reentrant structures aligning deposition so that the third electrically conductive material does not directly contact the first electrically conductive material, and does not directly contact the second electrically conductive material.
Forrest, Stephen (Princeton, NJ), Xue, Jiangeng (Piscataway, NJ)
12/ 005,773
December 27, 2007
UNITED STATES GOVERNMENT RIGHTS [0001] This invention was made with U.S. Government support under Contract No. 339-6002 awarded by the U.S. Air Force Office of Scientific Research and under Contract No. 341-4141 awarded by U.S. Department of Energy, National Renewable Energy Laboratory. The government has certain rights in this invention.