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3. Fraunhofer Institute for Solar Energy Systems, ISE. (2018). Photovoltaics Report. https://www.ise.fraunhofer.de/content/dam/ise/de/documents/publications/studies/Photovoltaics-Report.pdf.
4. Printable Solar Cells,2017
5. Oxford PV. (2018). Oxford PV sets world record for perovskite solar cell. https://www.oxfordpv.com/news/oxford-pv-sets-world-record-perovskite-solar-cell.