All solar efficiency breakthroughs since 1975 on a single chart

Treehugger: The National Center for Photovoltaics (NCPV), which is part of the U.S. National Renewable Energy Lab (NREL), maintains a chart that shows efficiency records for all kinds of research solar technologies, from more vanilla to very exotic flavors (thin-film, single-junction cells, multi-junction cells, organic cells, quantum dot cells, etc). Above is the latest version as of April 2013.

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