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2. http://www.pv-tech.org/news/trina-solar-sets-new-efficiency-record-for-mono-crystalline-silicon-solar-c.
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4. http://ir.trinasolar.com/phoenix.zhtml?c=206405&p=irol-newsArticle&ID=2230468.
5. B. Min, H. Wagner, M. Müller, D.H. Neuhaus, R. Brendel and P.P. Altermatt. "Incremental efficiency improvements of mass-produced PERC cells up to 24%, predicted solely with continuous development of existing technologies and wafer materials,” Proc. of the 31st European Photovoltaic Solar Energy Conference and Exhibition, Hamburg, Germany, pp. 473-476, 2015.