Effect of proton irradiation on electrical properties of CuInSe2 thin films

Hae Seok Lee, Hiroshi Okada, Akihiro Wakahara, Akira Yoshida, Takeshi Ohshima, Hisayoshi Itoh, Shirou Kawakita, Mitsuru Imaizumi, Sumio Matsuda

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


High-energy proton irradiation (380 keV and 1 MeV) on the electrical properties of CuInSe2 (CIS) thin films has been investigated. The samples were epitaxially grown on GaAs (001) substrates by Radio Frequency sputtering. As the proton fluence exceeded 1 × 1013 cm-2, the carrier concentration and mobility of the CIS thin films were decreased. The carrier removal rate with proton fluence was estimated to be about 1000 cm-1. The electrical properties of CIS thin films before and after irradiation were studied between 80 and 300K. From the temperature dependence of the carrier concentration in CIS thin films, we found ND = 9.5 × 1016 cm-3, NA = 3.7 × 1016 cm-3 and ED= 21 meV from the fitting to the experimental data on the basis of the charge balance equation. After irradiation, a defect level was created, and NT = 1 × 1017 cm-3 for a fluence of 3 × 1013 cm-2, NT = 5.7 × 1017 cm-3 for a fluence of 1 × 1014 cm-2 and ET = 95 meV were also obtained from the same fitting. The new defect, which acted as an electron trap, was due to proton irradiation, and the defect density was increased with proton fluence.

Original languageEnglish
Pages (from-to)57-63
Number of pages7
JournalSolar Energy Materials and Solar Cells
Issue number1-2
Publication statusPublished - 2003 Jan
Externally publishedYes


  • Carrier removal rate
  • CuInSe (CIS)
  • Irradiation-induced defect
  • Proton irradiation
  • Solar cell

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films


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