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首页> 外文期刊>Chemistry: A European journal >SiO_2/TiO_2 Hollow Nanoparticles Decorated with Ag Nanoparticles: Enhanced Visible Light Absorption and Improved Light Scattering in Dye-Sensitized Solar Cells
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SiO_2/TiO_2 Hollow Nanoparticles Decorated with Ag Nanoparticles: Enhanced Visible Light Absorption and Improved Light Scattering in Dye-Sensitized Solar Cells

机译：Ag纳米颗粒修饰的SiO_2 / TiO_2空心纳米颗粒：染料敏化太阳能电池中可见光吸收增强和光散射增强

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摘要

Hollow SiO_2/TiO_2 nanoparticles decorated with Ag nanoparticles(NPs) of controlled size(Ag@HNPs) were fabricated in order to enhance visible-light absorption and improve light scattering in dye-sensitized solar cells(DSSCs). They exhibited localized surface plasmon resonance(LSPR) and the LSPR effects were significantly influenced by the size of the Ag NPs. The absorption peak of the LSPR band dramatically increased with increasing Ag NP size. The LSPR of the large Ag NPs mainly increased the light absorption at short wavelengths, whereas the scattering from the SiO_2/ TiO_2 HNPs improved the light absorption at long wavelengths. This enabled the working electrode to use the full solar spectrum. Furthermore, the SiO_2 layer thickness was adjusted to maximize the LSPR from the Ag NPs and avoid corrosion of the Ag NPs by the electrolyte. Importantly, the power conversion efficiency(PCE) increased from 7.1% with purely TiO_2-based DSSCs to 8.1% with HNP-based DSSCs, which is an approximately 12% enhancement and can be attributed to greater light scattering. Furthermore, the PCEs of Ag@HNP-based DSSCs were 11% higher(8.1 vs. 9.0%) than the bare-HNP-based DSSCs, which can be attributed to LSPR. Together, the PCE of Ag@HNP-based DSSCs improved by a total of 27 %, from 7.1 to 9.0 %, due to these two effects. This comparative research will offer guidance in the design of multifunctional nanomaterials and the optimization of solar-cell performance.
机译：制备了可控尺寸的Ag纳米颗粒（Ag @ HNPs）修饰的中空SiO_2 / TiO_2纳米颗粒，以增强染料敏化太阳能电池（DSSCs）的可见光吸收并改善光散射。它们表现出局部表面等离振子共振（LSPR），并且LSPR的作用受Ag NPs的大小显着影响。 LSPR带的吸收峰随着Ag NP尺寸的增加而急剧增加。大型Ag NPs的LSPR主要增加短波长下的光吸收，而SiO_2 / TiO_2 HNPs的散射提高了长波长下的光吸收。这使工作电极可以使用整个太阳光谱。此外，调节SiO 2层的厚度以使来自Ag NP的LSPR最大化，并避免电解质腐蚀Ag NP。重要的是，功率转换效率（PCE）从纯TiO_2基DSSC的7.1％提高到了HNP基DSSC的8.1％，这大约提高了12％，这可以归因于更大的光散射。此外，基于Ag @ HNP的DSSC的PCE比基于裸HNP的DSSC的PCE高11％（8.1对9.0％），这可以归因于LSPR。由于这两种作用，基于Ag @ HNP的DSSC的PCE总计提高了27％，从7.1％提高到9.0％。这项比较研究将为多功能纳米材料的设计和太阳能电池性能的优化提供指导。

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