Heteroepitaxy and characterization of CuGaSe2 layers grown by low-pressure metalorganic chemical-vapor deposition

S. Chichibu, Y. Harada, M. Uchida, T. Wakiyama, S. Matsumoto, S. Shirakata, S. Isomura, H. Higuchi

研究成果: Article査読

49 被引用数 (Scopus)

抄録

CuGaSe2 chalcopyrite compounds were grown heteroepitaxially on both GaAs and GaP substrates by means of the low-pressure metalorganic chemical-vapor deposition method. Optical and structural properties were characterized comprehensively by photoreflectance (PR), photoluminescence (PL), x-ray diffraction, transmission electron microscopy, transmission electron diffraction, and electron-probe microanalysis. The CuGaSe2 epilayers had c(001) surface on GaAs(001) substrates and a(100) surface on GaP(001) substrates, respectively, the results being similar to the case of CuAlSe 2. Energies of A, B, and C excitons associated with uppermost valence bands were determined from analysis of PR spectra, and the energies of good-quality epilayers are close to those of the bulk crystal. The slight increase of the crystal-field splitting in the valence bands were discussed in terms of the lattice strain in the epilayer caused by the lattice mismatch. Low-temperature PL spectra exhibited an intense peak at 1.71 eV, the energy being in good agreement with the A-exciton energy. A weak peak due to a free-to-acceptor transition was also observed at 1.66 eV. A broad PL peak at 1.76 eV was observed together with the intense band-edge PL at 1.67 eV, and the peak was assigned to relate to the B-exciton transition.

本文言語English
ページ(範囲)3009-3015
ページ数7
ジャーナルJournal of Applied Physics
76
5
DOI
出版ステータスPublished - 1994
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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