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: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Low transparency of conventional transparent conducting oxides (TCOs) in the IR region (λ1 nm) due to absorption and reflection by the high concentration of free carrier restricts the applications of materials to photovoltaics that do not use the infrared part of the solar spectrum. In order to maintain low resistivity with reduced free carrier absorption, TCOs with high mobility are required. We have found that among metal oxides, CdO has all the essential requirements for low resistance and high infrared transmission: low electron scattering rates and high electron mobility. In this work we report the electrical and optical properties of CdO, undoped and doped with various n-type dopants, grown using pulsed laser deposition (PLD). We found that nominally undoped CdO films have Hall mobilities in the range of 50-150 cm2/Vs with carrier concentrations of 3×1020-2×1019 cm3 corresponding to a high compensation ratio k=0.7. However, with appropriate intentional doping, ideal uncompensated CdO with extremely high conductivity (>104 S/cm) and an excellent transmission window in the range from 400 to >1500 nm can be achieved. These properties make CdO an ideal TCO for photovoltaics with low band gap absorbers including Si and high efficiency multijunction cells.

Original languageEnglish (US)
Title of host publicationProgram - 38th IEEE Photovoltaic Specialists Conference, PVSC 2012
Pages2024-2029
Number of pages6
DOIs
StatePublished - Nov 26 2012
Event38th IEEE Photovoltaic Specialists Conference, PVSC 2012 - Austin, TX, United States
Duration: Jun 3 2012Jun 8 2012

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371

Other

Other38th IEEE Photovoltaic Specialists Conference, PVSC 2012
CountryUnited States
CityAustin, TX
Period6/3/126/8/12

Keywords

  • Cadmium oxide
  • Photovoltaic cells
  • Transparent Conducting oxides
  • Wide band gap semiconductors

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