Photoluminescence （PL） conversion of Si nanoparticles by absorbing ultraviolet （UV） lights and emitting visible ones has been used to improve the efficiency of crystalline Si solar cells. Si nanoparticle thin film...Photoluminescence （PL） conversion of Si nanoparticles by absorbing ultraviolet （UV） lights and emitting visible ones has been used to improve the efficiency of crystalline Si solar cells. Si nanoparticle thin films are prepared by pulverizing porous Si in ethanol and then mixing the suspension with a SiO2 sol-gel （SOG）. This SOG is spin-deposited onto the surface of the Si solar cells and dries in air. The short-circuit current as a function of Si nanoparticle concentration is investigated under UV illumination. The maximal increase is found at a Si concentration of 0.1 mg/mL. At such concentration and under the irradiation of an AM0 solar simulator, the photoelectric conversion efficiency of the crystalline Si solar cell is relatively increased by 2.16% because of the PL conversion.展开更多
A TiO2/porous silicon(PS) composite system is prepared by chemical vapor deposition.The crystal form with anatase phase of the samples is evaluated by X-ray diffraction and ultraviolet-visible(UV-vis) absorbance spect...A TiO2/porous silicon(PS) composite system is prepared by chemical vapor deposition.The crystal form with anatase phase of the samples is evaluated by X-ray diffraction and ultraviolet-visible(UV-vis) absorbance spectra,and the morphology with microsphere of TiO2particles is characterized by scanning electron microscopy.The composite system formed by this technique gives a broad blue luminescence and the mechanism of photoluminescence with TiO2/PS is also discussed.展开更多
基金Acknowledgments This work was supported by the National Natural Science Foundation of China （No： 60671010, 20775045） and Natural Science Foundation of Shandong Province （Y2006B29）. The authors wish to thank Mr. Sun and Mr. Shao for their helps in measurements of SEM and XPS.
基金supported by the National Basic Research Program of China (No. 2010CB933703)the National Natural Science Foundation of China (No.60878044)
文摘Photoluminescence （PL） conversion of Si nanoparticles by absorbing ultraviolet （UV） lights and emitting visible ones has been used to improve the efficiency of crystalline Si solar cells. Si nanoparticle thin films are prepared by pulverizing porous Si in ethanol and then mixing the suspension with a SiO2 sol-gel （SOG）. This SOG is spin-deposited onto the surface of the Si solar cells and dries in air. The short-circuit current as a function of Si nanoparticle concentration is investigated under UV illumination. The maximal increase is found at a Si concentration of 0.1 mg/mL. At such concentration and under the irradiation of an AM0 solar simulator, the photoelectric conversion efficiency of the crystalline Si solar cell is relatively increased by 2.16% because of the PL conversion.
基金supported by the Program for New Century Excellent Talents in University of China(No. NCET-05-0897)the Scientific Research Project for Universities in Xinjiang,China(No.XJEDU2006I10).
文摘A TiO2/porous silicon(PS) composite system is prepared by chemical vapor deposition.The crystal form with anatase phase of the samples is evaluated by X-ray diffraction and ultraviolet-visible(UV-vis) absorbance spectra,and the morphology with microsphere of TiO2particles is characterized by scanning electron microscopy.The composite system formed by this technique gives a broad blue luminescence and the mechanism of photoluminescence with TiO2/PS is also discussed.
