1. Electrochemical Photolysis of Water at a Semiconductor Electrode
2. The path to 25% silicon solar cell efficiency: History of silicon cell evolution
3. Ohl, R. S.U.S. Patent 2,443,542, 1941.
4. Bullis, K.Cheap Hydrogen. MIT Technology Review [Online] January 31, 2008, http://www.technologyreview.com/news/409464/cheap-hydrogen/(accessed June 24, 2013).
5. McKenna, P.A Greener ‘Artificial Leaf.’ MIT Technology Review [Online] April 7, 2011,http://www.technologyreview.com/news/423569/a-greener-artificial-leaf/(accessed June 24, 2013).