Optical properties of high-quality CuGaSe2 epitaxial layers examined by piezoelectric photoacoustic spectroscopy

Kenji Yoshino, Naoji Mitani, Tetsuo Ikari, Paul J. Fons, Shigeru Niki, Akimasa Yamada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The piezoelectric photoacoustic (PPA) signals for Cu-rich CuGaSe2 (CGS) /GaAs (001) epitaxial layer (Cu/Ga = 1.09-2.16) grown by molecular beam epitaxy (MBE) were successfully obtained at liquid-nitrogen temperature. The bandgap energies of CGS (A-band) decreased and GaAs was not almost changed with increasing the Cu/Ga ratios. This phenomenon was very similar to that of free exciton (FE) by photoluminescence (PL) and the lattice parameter c by X-ray diffraction (XRD) measurements.

Original languageEnglish
Pages (from-to)173-178
Number of pages6
JournalSolar Energy Materials and Solar Cells
Issue number1-4
Publication statusPublished - 2001 Mar
Externally publishedYes

ASJC Scopus subject areas

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


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