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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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
Volume46
Issue number24
DOIs
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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