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Researchers in Japan recently reported a triple-junction amorphous Si solar cell with a stabilized efficiency of 13.6%, a world record for triple junction thin film Si solar cells:

http://scitation.aip.org/docserver/fulltext/aip/journal/apl/106/21/1.4921794.pdf?expires=1433502759&id=id&accname=guest&checksum=F3214C32C4C1870006DE29D99DCA89B0

This triple junction solar cell is comprised of one a-Si cell, and two microcrystalline Si cells (uc-Si), whereas many triple junction a-Si cells demonstrated in the past have made use of amorphous silicon germanium (a:SiGe:H). A key reason these researchers were able to achieve the record stabilized efficiency is because the triple junction device was “current limited” by one of the uc-Si cells, which can exhibit very little initial performance degradation due to the Staebler-Wronski effect, which can significantly decrease the efficiency of amorphous Si solar cells.

The triple junction solar cell achieves a Vmpp of 1.58 V and Jmpp of 9 mA; a pretty good match for water splitting!

Here is an additional write-up from Phys.org:

http://phys.org/news/2015-06-solar-cell-world-stabilized-efficiency.html

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