Electroreflectance of CuInSe2 single crystals

Sho Shirakata, Shigefusa Chichibu, Shigehiro Isomura, Hisayuki Nakanishi

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26 Citations (Scopus)


Electrolyte electroreflectance (ER) measurements have been carried out at room temperature (297 K) on a series of bulk single crystals of CuInSe2 prepared by the normal freezing method with various Cu/In ratios. The Cu-rich crystals exhibited sharp ER peaks and the AB-transition energy is 1.026 eV, while In-rich crystals exhibited broader ER peaks and smaller AB-transition energies (1.00-1.02 eV) than those of the Cu-rich ones. The spin-orbit splitting of the uppermost valence band is 0.236 eV. The effect of the Cu/In ratio on the ER spectra is discussed in terms of the Urbach energy determined by optical absorption measurement, and the bandgap energy of the stoichiometric CuInSe2 crystal is discussed.

Original languageEnglish
Pages (from-to)L543-L546
JournalJapanese Journal of Applied Physics
Issue number5 A
Publication statusPublished - 1997


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