Piezoelectric Photoacoustic Spectra In CuGaSe2 Thin Films Grown by Molecular Beam Epitaxy
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AbstractThe piezoelectric photoacoustic (PPA) spectra for Cu-rich CuGaSe2 (CGS)/GaAs epitaxial layers were successfully observed between liquid nitrogen and room temperatures for the first time. Bandgap energy of CGS (A band) is estimated to be 1.72 eV at liquid nitrogen temperature. The activation energies of three possible intrinsic defect levels are estimated to be about 80, 130 and 190 meV.
2010 ◽
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2012 ◽
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2012 ◽
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