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The article itself has a more up-to-date version of that chart with this (and other) developments. https://www.helmholtz-berlin.de/pubbin/news_datei?did=15092

• tuatoru 4y ago
  That chart is one of the variants of a chart published and maintained by NREL, the US National Renewable Energy Laboratory: https://www.nrel.gov/pv/cell-efficiency.html https://www.nrel.gov/pv/cell-efficiency.html Interactive version: https://www.nrel.gov/pv/interactive-cell-efficiency.html https://www.nrel.gov/pv/interactive-cell-efficiency.html NREL's website has a lot of good stuff if you're interested in renewable energy.