Electrical and photovoltaic characteristics of CuInSe2 thin films processed by nontoxic Cu-In precursor solutions

Ik Jin Choi, Jin Woo Jang, Seung Min Lee, Deuk Ho Yeon, Yeon Hwa Jo, Myung Ho Lee, Jae Ho Yun, Kyung Hoon Yoon, Yong Soo Cho

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3 Citations (Scopus)


Nontoxic Cu-In solution-processed CuInSe2 absorber thin films and resultant photovoltaic cells have been investigated. Acetate-based Cu-In precursors having different Cu/In ratios of 0.8-1.2 were deposited by spin-coating and then selenized in Se atmosphere up to 550 °C. Single tetragonal CuInSe2 phase was dominantly obtained regardless of Cu/In ratios, with the segregation of Cu2-xSe secondary phase only in the case of Cu-rich films as evidenced by Raman spectra. The films with the 1.1 ratio demonstrated a larger grain size of ∼1.06 m with an increased carrier concentration of ∼1.7 × 1018 cm-3 and a decreased band gap of ∼1.02 eV, compared to the values obtained for Cu-deficient absorber films. The resultant best cell efficiency was ∼3.1% for the absorber having the 1.1 ratio, suggesting a potential of this simple spin-coating method as an alternative to typical vacuum processes.

Original languageEnglish
Article number245102
JournalJournal of Physics D: Applied Physics
Issue number24
Publication statusPublished - 2013 Jun 19

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


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