Ideal transparent conductors for full spectrum photovoltaics

Kin Man Yu, Marie A. Mayer, Derrick T. Speaks, Hongcai He, Ruying Zhao, L. Hsu, Samuel S. Mao, E. E. Haller, Wladek Walukiewicz

Research output: Contribution to journalArticlepeer-review

95 Scopus citations


In current technologies, state-of-the-art transparent conducting oxides exhibit good conductivity (∼5×10 3 S/cm) and transparency up to only λ ∼ 1000 nm, restricting the use of such thin films to photovoltaics that are not utilizing the infrared part of the solar spectrum. We have found that among metal oxides, high electron mobility CdO satisfies the essential requirements for a low resistance and high infrared transmission transparent contact. With appropriate intentional doping, we have achieved ideal uncompensated CdO with extremely high conductivity (>10 4 S/cm) and an excellent transmission window in the range from 400 to >1500 nm, making this material an ideal TCO for photovoltaics with low band gap absorbers.

Original languageBritish English
Article number123505
JournalJournal of Applied Physics
Issue number12
StatePublished - 15 Jun 2012


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