Cupric oxide（CuO） is considered to be a promising material for photovoltaie applications. In this paper, p-CuO/n-Si junction solar cells were obtained by thermal oxidation of metallic copper films deposited on n-Si ...Cupric oxide（CuO） is considered to be a promising material for photovoltaie applications. In this paper, p-CuO/n-Si junction solar cells were obtained by thermal oxidation of metallic copper films deposited on n-Si substrates at 400 ℃ for 5 h. X-ray diffraction patterns show that the as-prepared films are CuO with monoelinic crystalline structure. Hall effect measurement results show that CuO films are p-type conduction. A direct band-gap of -1.57 eV for the CuO film is deduced from UV-Vis absorbance spectra. Solar cells of Cu/p-CuO/n-Si/Al structure show that its photovoltaic behavior has a much wider spectrum response width compared with that of Si solar cells. In addition, the photocurrent of CuO/n-Si junction is investigated as a function of CuO film thickness, and it is found that the critical thickness for CuO on Si is about 250 nm.展开更多
Transparent oxyfluoride silicate precursor glasses and glass ceramics with the novel composition （1） SiO2-PbO-PbFE-Er2O3, （2） SiO2-GeOE-PbO-PbFE-Er2O3 （3） SiO2-Al2O3-Y2O3-Na2O-NaF-LiF-Er2O3-YbF3 doped with Er^3...Transparent oxyfluoride silicate precursor glasses and glass ceramics with the novel composition （1） SiO2-PbO-PbFE-Er2O3, （2） SiO2-GeOE-PbO-PbFE-Er2O3 （3） SiO2-Al2O3-Y2O3-Na2O-NaF-LiF-Er2O3-YbF3 doped with Er^3＋ and co-doped with Er^3＋/Yb^3＋ ions were synthesized. X-ray diffraction analysis （XRD） and Er3＋ absorption spectra revealed precipitation of PbF2 nanocrystals dispersed in the glassy matrix. Under 980 nm laser excitation, intense green, red and near IR bands of upconversion luminescence （UCL） were recorded both before and after heat treatment. In the glass ceramics the upconversion intensity increased significantly. To our knowledge, for the first time the composition of the glass ceramics characterized by the small-angle neutron scattering （SANS） showed the cluster organization of PbF2 nanocrystals.展开更多
基金Chinese National Natural Science Foundation(60576063)The Science and Technology Project of Zhejiang province(2008F70015)
文摘Cupric oxide（CuO） is considered to be a promising material for photovoltaie applications. In this paper, p-CuO/n-Si junction solar cells were obtained by thermal oxidation of metallic copper films deposited on n-Si substrates at 400 ℃ for 5 h. X-ray diffraction patterns show that the as-prepared films are CuO with monoelinic crystalline structure. Hall effect measurement results show that CuO films are p-type conduction. A direct band-gap of -1.57 eV for the CuO film is deduced from UV-Vis absorbance spectra. Solar cells of Cu/p-CuO/n-Si/Al structure show that its photovoltaic behavior has a much wider spectrum response width compared with that of Si solar cells. In addition, the photocurrent of CuO/n-Si junction is investigated as a function of CuO film thickness, and it is found that the critical thickness for CuO on Si is about 250 nm.
文摘Transparent oxyfluoride silicate precursor glasses and glass ceramics with the novel composition （1） SiO2-PbO-PbFE-Er2O3, （2） SiO2-GeOE-PbO-PbFE-Er2O3 （3） SiO2-Al2O3-Y2O3-Na2O-NaF-LiF-Er2O3-YbF3 doped with Er^3＋ and co-doped with Er^3＋/Yb^3＋ ions were synthesized. X-ray diffraction analysis （XRD） and Er3＋ absorption spectra revealed precipitation of PbF2 nanocrystals dispersed in the glassy matrix. Under 980 nm laser excitation, intense green, red and near IR bands of upconversion luminescence （UCL） were recorded both before and after heat treatment. In the glass ceramics the upconversion intensity increased significantly. To our knowledge, for the first time the composition of the glass ceramics characterized by the small-angle neutron scattering （SANS） showed the cluster organization of PbF2 nanocrystals.
