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Start Over Author "XIAO Peng" Journal ceramics international
132 results on '"XIAO Peng"'

42. Selective growth and characterization of gallium nitride nanowires through an N-Ga2O3 layer

Author

Rui Sun, Xiao-Peng Liu, Gui-Gen Wang, Lin Cui, Hua-Yu Zhang, Jiecai Han, and Can Zhu

Subjects
Materials science, Photoluminescence, business.industry, Process Chemistry and Technology, Nanowire, Gallium nitride, Chemical vapor deposition, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, symbols.namesake, chemistry, Materials Chemistry, Ceramics and Composites, symbols, Sapphire, Optoelectronics, Raman spectroscopy, business, Luminescence, Wurtzite crystal structure
Abstract

GaN nanowires were synthesized on sapphire substrates by chemical vapor deposition. The selective growth of GaN nanowires was obtained through an N-Ga 2 O 3 layer prepared by radio frequency magnetron sputtering. The X-ray diffraction (XRD) and Raman measurements indicated the GaN nanowires to be all indexed to the hexagonal wurtzite structure. The photoluminescence (PL) spectra were composed of a strong UV emission peak (365 nm) and a weak yellow luminescence (YL) band (~600 nm). The selective growth mechanism of GaN nanowires was briefly discussed.

Published
2014

43. Performance improvement of dye-sensitized solar cells by introducing a hierarchical compact layer involving ZnO and TiO2 blocking films

Author

Bao Zhang, Xiao Peng, Yanbo Yang, Yaqing Feng, Liping Lin, and Si Chen

Subjects
Spin coating, Materials science, business.industry, Process Chemistry and Technology, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Dielectric spectroscopy, Dye-sensitized solar cell, Materials Chemistry, Ceramics and Composites, Optoelectronics, business, Electrical conductor, Layer (electronics), Current density, Voltage, Dark current
Abstract

The novel hierarchical compact layer involving ZnO and TiO 2 blocking films is used to improve the overall performance of dye-sensitized solar cells. The ZnO compact films are fabricated as a bottom layer to block the electrons injection to the conductive glass and improve the open-circuit voltage. The TiO 2 compact layer is employed to suppress back electron transfer and avoid ZnO contacting the acid dyes directly. The short-circuit current density of the DSSC containing the hierarchical compact layer is improved by 30% compared to that of one with only ZnO as the compact layer. The open-circuit voltage is increased by 4% after introducing the additional TiO 2 blocking layer between the ZnO compact layer and mesoporous TiO 2 layer. Overall, the short-circuit current density, open-circuit voltage and solar energy conversion efficiency are enhanced by 15.3%, 3.7% and 29.6%, respectively, relative to the traditional DSSC without any blocking layers. The ZnO–TiO 2 blocking layer has been characterized by electrochemical impedance spectroscopy, open-circuit voltage decay and dark current measurement to reveal the mechanism of short-circuit current density and open-circuit voltage improvement.

Published
2014

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