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        Photoluminescence and Electromodulation Spectroscopy Characterization of Zn0.93Mg0.07Se and Zn0.81Be0.04Mg0.15Se Mixed Crystals

        H. P. Hsu,D. O. Dumcenco,C. T. Huang,Y. S. Huang,F. Firszt,S. Legowski,H. Meczynsk,K. Strza lkowski,A. Marasek,K. K. Tiong 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1

        A detailed optical characterization of zinc-blende-type Zn0.93Mg0.07Se and Zn0.81Be0.04Mg0.15Se mixed-crystal samples grown by using the modified high pressure Bridgman method has been carried out via photoluminescence (PL), contactless electrore ectance (CER) and photore ectance (PR) in the temperature range of 15 to 400 K. PL spectra at low temperatures consist of an exciton line, a broader emission band due to recombination of donor-acceptor pairs and a broad band related to recombination through deep-level defects. Interband transitions, originating from the band edge and spin-orbit splitting critical points, have been observed in the CER/PR spectra. The optical properties of these two mixed crystals are compared and the results indicate the superior quality of the Be-incorporated mixed quaternary crystals. The peak positions of the excitonic emission lines in the PL spectra correspond quite well to the energies of the fundamental transitions obtained by means of electromodulation data. The parameters that describe the temperature dependence of the fundamental and spin split-off band gaps and the broadening function of the band-edge excitons are evaluated and discussed. A detailed optical characterization of zinc-blende-type Zn0.93Mg0.07Se and Zn0.81Be0.04Mg0.15Se mixed-crystal samples grown by using the modified high pressure Bridgman method has been carried out via photoluminescence (PL), contactless electrore ectance (CER) and photore ectance (PR) in the temperature range of 15 to 400 K. PL spectra at low temperatures consist of an exciton line, a broader emission band due to recombination of donor-acceptor pairs and a broad band related to recombination through deep-level defects. Interband transitions, originating from the band edge and spin-orbit splitting critical points, have been observed in the CER/PR spectra. The optical properties of these two mixed crystals are compared and the results indicate the superior quality of the Be-incorporated mixed quaternary crystals. The peak positions of the excitonic emission lines in the PL spectra correspond quite well to the energies of the fundamental transitions obtained by means of electromodulation data. The parameters that describe the temperature dependence of the fundamental and spin split-off band gaps and the broadening function of the band-edge excitons are evaluated and discussed.

      • KCI등재

        Optical Characterization of Zn0.95-xBe0.05MnxSe Mixed Crystals

        H. P. Hsu,T. W. Chang,Y. S. Huang,F. Firszt,S. Legowski,H. Meczynsk,A. Marasek,K. Strza lkowski,K. K. Tiong,M. Munoz 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1

        Temperature-dependent photoluminescence (PL), contactless electrore ectance (CER) and surface photovoltage spectroscopy (SPS) characterizations of two Zn0.95-xBe0.05MnxSe mixed crystals with Mn contents x=0.05 and 0.20 grown by using the modified high-pressure Bridgman method has been carried out in the temperature range of 15-300 K. A typical PL spectrum at low temperature consists of a free exciton line, an edge emission due to recombenation of shallow donor-acceptor pairs and Mn2+-related intra-ionnic emissions. Te near band edge transition energies are determined lines in the PL spectra correspond quite well to the energies of the fundamental trasitions determinde from CER and SPS data. The parameters that descrbe the temperature dependence of the trasition energy of the fundamental band-edge excton are evaluated and discussed. Temperature-dependent photoluminescence (PL), contactless electrore ectance (CER) and surface photovoltage spectroscopy (SPS) characterizations of two Zn0.95-xBe0.05MnxSe mixed crystals with Mn contents x=0.05 and 0.20 grown by using the modified high-pressure Bridgman method has been carried out in the temperature range of 15-300 K. A typical PL spectrum at low temperature consists of a free exciton line, an edge emission due to recombenation of shallow donor-acceptor pairs and Mn2+-related intra-ionnic emissions. Te near band edge transition energies are determined lines in the PL spectra correspond quite well to the energies of the fundamental trasitions determinde from CER and SPS data. The parameters that descrbe the temperature dependence of the trasition energy of the fundamental band-edge excton are evaluated and discussed.

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