Nano metal-particle dispersed glasses are the attractive candidates for nonlinear optical material applications. Au/SiO2 nano-composite thin films with 3 vol% to 65 vol% Au are prepared by inductively coupled plasma s...Nano metal-particle dispersed glasses are the attractive candidates for nonlinear optical material applications. Au/SiO2 nano-composite thin films with 3 vol% to 65 vol% Au are prepared by inductively coupled plasma sputtering. Au particles as perfect spheres with diameters between 10 nm and 30 nm are uniformly dispersed in the SiO2 matrix. Optical absorption peaks due to the surface plasmon resonance of Au particles are observed. The absorption property is enhanced with the increase of Au content, showing a maximum value in the films with 37 vol% Au. The absorption curves of the Au/SiO2 thin films with 3 vol% to 37 vol% Au accord well with the theoretical optical absorption spectra obtained from Mie resonance theory. Increasing Au content over 37 vol% results in the partial connection of Au particles, whereby the intensity of the absorption peak is weakened and ultimately replaced by the optical absorption of the bulk. The band gap decreases with Au content increasing from 3 vol% to 37 vol % but increases as Au content further increases.展开更多
染料敏化太阳能电池(dye-sensitized solar cells,DSCs)因其制备工艺简单、成本低廉以及优异的光学性质在近年来引起了大家的广泛关注.为了获得更优的光电性能,利用球磨法制备了一系列不同含量纳米结构SiO2@Au和固定含量石墨烯协同掺杂...染料敏化太阳能电池(dye-sensitized solar cells,DSCs)因其制备工艺简单、成本低廉以及优异的光学性质在近年来引起了大家的广泛关注.为了获得更优的光电性能,利用球磨法制备了一系列不同含量纳米结构SiO2@Au和固定含量石墨烯协同掺杂的复合光阳极薄膜,并制备了相应的DSCs.研究了纳米结构SiO2@Au和石墨烯联合掺杂对光阳极及其相应DSCs光电转换性能的影响.金纳米颗粒因其局域表面等离子体共振效应能够有效提高DSCs的短路电流密度.而石墨烯作为典型的二维材料,具有较大的比表面积以及高导电性等优异性质,有利于增加薄膜的比表面积.当纳米结构SiO2@Au和石墨烯协同掺杂至光阳极薄膜内部,且SiO2@Au掺杂量为1.5%时,相应电池的短路电流密度为15.59 mA·cm–2,光电转换效率为6.68%,相比基于传统纯TiO2光阳极电池的性能分别提高了15.67%和8.8%.研究表明,基于不同含量复合纳米结构SiO2@Au和固定量石墨烯共掺的DSCs性能的提高,主要归因于复合纳米结构SiO2@Au的掺入,其中分布较为均匀的金纳米颗粒作为光学天线可以将光局域到颗粒表面,增强表面电磁场强度,有效增强光与物质的相互作用,优化了染料的光吸收能力,增加薄膜内部光生载流子数量.而石墨烯的引入则改善了光阳极薄膜的比表面积,增加了薄膜整体对染料的吸附量,且石墨烯良好的导电性能加快了光生载流子的传输,两者协同作用实现了DSCs的光电转换性能的优化.展开更多
The samples of Au/(Si/SiO2 )/p-Si structure were fabricated by using the R. F magnetron sputtering technique. Its carrier transport and electroluminescence mechanism were studied from the Ⅰ-Ⅴ curves and EL spectra...The samples of Au/(Si/SiO2 )/p-Si structure were fabricated by using the R. F magnetron sputtering technique. Its carrier transport and electroluminescence mechanism were studied from the Ⅰ-Ⅴ curves and EL spectra by using the Configuration Coordinate as a theoretical model. The result indicates that there are two defect centers in SiO2 films. The electron in Au and the hole in p-Si went into SiO2 film by the Fowler-Nordheim tunneling model at a high bias voltage and recombined through these defect centers in SiO2 film.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos 50842028 and 50972012)the National Basic Research Program of China (Grant No 2007CB613301)
摘要Nano metal-particle dispersed glasses are the attractive candidates for nonlinear optical material applications. Au/SiO2 nano-composite thin films with 3 vol% to 65 vol% Au are prepared by inductively coupled plasma sputtering. Au particles as perfect spheres with diameters between 10 nm and 30 nm are uniformly dispersed in the SiO2 matrix. Optical absorption peaks due to the surface plasmon resonance of Au particles are observed. The absorption property is enhanced with the increase of Au content, showing a maximum value in the films with 37 vol% Au. The absorption curves of the Au/SiO2 thin films with 3 vol% to 37 vol% Au accord well with the theoretical optical absorption spectra obtained from Mie resonance theory. Increasing Au content over 37 vol% results in the partial connection of Au particles, whereby the intensity of the absorption peak is weakened and ultimately replaced by the optical absorption of the bulk. The band gap decreases with Au content increasing from 3 vol% to 37 vol % but increases as Au content further increases.
摘要染料敏化太阳能电池(dye-sensitized solar cells,DSCs)因其制备工艺简单、成本低廉以及优异的光学性质在近年来引起了大家的广泛关注.为了获得更优的光电性能,利用球磨法制备了一系列不同含量纳米结构SiO2@Au和固定含量石墨烯协同掺杂的复合光阳极薄膜,并制备了相应的DSCs.研究了纳米结构SiO2@Au和石墨烯联合掺杂对光阳极及其相应DSCs光电转换性能的影响.金纳米颗粒因其局域表面等离子体共振效应能够有效提高DSCs的短路电流密度.而石墨烯作为典型的二维材料,具有较大的比表面积以及高导电性等优异性质,有利于增加薄膜的比表面积.当纳米结构SiO2@Au和石墨烯协同掺杂至光阳极薄膜内部,且SiO2@Au掺杂量为1.5%时,相应电池的短路电流密度为15.59 mA·cm–2,光电转换效率为6.68%,相比基于传统纯TiO2光阳极电池的性能分别提高了15.67%和8.8%.研究表明,基于不同含量复合纳米结构SiO2@Au和固定量石墨烯共掺的DSCs性能的提高,主要归因于复合纳米结构SiO2@Au的掺入,其中分布较为均匀的金纳米颗粒作为光学天线可以将光局域到颗粒表面,增强表面电磁场强度,有效增强光与物质的相互作用,优化了染料的光吸收能力,增加薄膜内部光生载流子数量.而石墨烯的引入则改善了光阳极薄膜的比表面积,增加了薄膜整体对染料的吸附量,且石墨烯良好的导电性能加快了光生载流子的传输,两者协同作用实现了DSCs的光电转换性能的优化.
摘要The samples of Au/(Si/SiO2 )/p-Si structure were fabricated by using the R. F magnetron sputtering technique. Its carrier transport and electroluminescence mechanism were studied from the Ⅰ-Ⅴ curves and EL spectra by using the Configuration Coordinate as a theoretical model. The result indicates that there are two defect centers in SiO2 films. The electron in Au and the hole in p-Si went into SiO2 film by the Fowler-Nordheim tunneling model at a high bias voltage and recombined through these defect centers in SiO2 film.