کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1609849 | 1516271 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and characterization of Ho3+-doped strontium titanate downconversion nanocrystals and its application in dye-sensitized solar cells
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
Ho3+-doped strontium titanate (SrTiO3:Ho3+) downconversion (DC) nanocrystals are synthesized by the solid state interaction of titanium dioxide, strontium nitrate, holmium oxide and sodium chloride and then used as a photoanode in dye-sensitized solar cells (DSSCs) to investigate the effect of DC nanocrystals in DSSCs. Differential thermal analysis, X-ray diffraction, scanning electronic microscope, energy dispersive spectroscopy and Brunauer-Emmet-Teller analysis confirmed the formation of cubic structured SrTiO3:Ho3+ nanocrystals with diameters of 40-400 nm, pore size of â¼45 nm, sintering temperature of 950 °C. The photofluorescence and UV-Vis absorption spectra of the SrTiO3:Ho3+ nanocrystals revealed strong emission intensity and visible light absorption when doped content of holmium oxide was between 1 wt% and 3 wt%. Compared with the pure SrTiO3 photoanode, SrTiO3:Ho3+ DC photoanode showed a greater photovoltaic efficiency. The photoelectric conversion efficiency (η) of the DSSCs with a SrTiO3:Ho3+ photoanode doped with 1 wt% holmium oxide was 59% higher than that with a pure SrTiO3 photoanode. This phenomenon could be explained by SrTiO3:Ho3+ nanocrystals' ability to absorb ultraviolet light and downconvert it to visible light, which extends spectral response range of DSSC to the ultraviolet region and increased the short-circuit current density (Jsc) of DSSCs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 622, 15 February 2015, Pages 1-7
Journal: Journal of Alloys and Compounds - Volume 622, 15 February 2015, Pages 1-7
نویسندگان
Y.Y. Li, H.S. Hao, L. Qin, H.L. Wang, M.Q. Nie, Z.Q. Hu, W.Y. Gao, G.S. Liu,