Real electronic states within the bandgap have been investigated for two different CuGaSe2 crystals by enhancement in resonant Raman scattering (RRS). On one crystal, a broad peak centered at 1.58 eV by photoluminescence (PL) measurement is also observed at 1.58-1.59 eV by RRS. On the other crystal, however, three peaks located at 1.64, 1.67 and 1.70 eV are found by RRS measurement, whereas only one peak at 1.62 eV exists in PL spectra. It is found that real electronic states can be examined in more detail by RRS measurement than by usual PL measurement.
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Univ Tsukuba, Fac Pure & Appl Sci, Div Appl Phys, Tsukuba, Ibaraki 3058573, Japan
Univ Tsukuba, Fac Pure & Appl Sci, Alliance Res North Africa ARENA, Tsukuba, Ibaraki 3058572, JapanUniv Tsukuba, Fac Pure & Appl Sci, Div Appl Phys, Tsukuba, Ibaraki 3058573, Japan
Islam, Muhammad Monirul
Ishizuka, Shogo
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Natl Inst Adv Ind Sci & Technol, Res Ctr Photovolta, Tsukuba, Ibaraki 3058568, JapanUniv Tsukuba, Fac Pure & Appl Sci, Div Appl Phys, Tsukuba, Ibaraki 3058573, Japan
Ishizuka, Shogo
Shibata, Hajime
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Natl Inst Adv Ind Sci & Technol, Res Ctr Photovolta, Tsukuba, Ibaraki 3058568, JapanUniv Tsukuba, Fac Pure & Appl Sci, Div Appl Phys, Tsukuba, Ibaraki 3058573, Japan
Shibata, Hajime
Niki, Shigeru
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Natl Inst Adv Ind Sci & Technol, Res Ctr Photovolta, Tsukuba, Ibaraki 3058568, JapanUniv Tsukuba, Fac Pure & Appl Sci, Div Appl Phys, Tsukuba, Ibaraki 3058573, Japan
Niki, Shigeru
Akimoto, Katsuhiro
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Univ Tsukuba, Fac Pure & Appl Sci, Div Appl Phys, Tsukuba, Ibaraki 3058573, JapanUniv Tsukuba, Fac Pure & Appl Sci, Div Appl Phys, Tsukuba, Ibaraki 3058573, Japan
Akimoto, Katsuhiro
Sakurai, Takeaki
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Univ Tsukuba, Fac Pure & Appl Sci, Div Appl Phys, Tsukuba, Ibaraki 3058573, JapanUniv Tsukuba, Fac Pure & Appl Sci, Div Appl Phys, Tsukuba, Ibaraki 3058573, Japan