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Chemistry. 2013 Sep 23;19(39):13120-6. doi: 10.1002/chem.201301518. Epub 2013 Aug 9.
Enhanced harvesting of visible light is vital to the development of highly efficient dye-sensitized solar cells (DSSCs). Nanosilver-decorated TiO2 nanofibers (Ag@TiO2 NFs) were synthesized by depositing chemically reduced Ag ions onto the surface of electrospun TiO2 nanofibers (TiO2 NFs). The prepared Ag@TiO2 NFs were coated with SiO2 (SiO2@Ag@TiO2 NFs) by using PVP as coupling agent for protecting corrosion of Ag nanoparticle by I(-)/I3(-) solution. The fabricated SiO2@Ag@TiO2 NFs demonstrated a synergistic effect of light scattering and surface plasmons, leading to an enhanced light absorption. Moreover, an anode consisting of SiO2@Ag@TiO2 NFs incorporating TiO2 nanoparticles (NPs) increased light harvesting without substantially sacrificing dye attachment. The power conversion efficiency increased from 6.8 to 8.7 % for a thick film (10 μm), that is, 28 %. These results suggest that SiO2@Ag@TiO2 NFs are promising materials for enhanced light absorption in dye-sensitized solar cells.
提高可见光的采集对于高效染料敏化太阳能电池（DSSC）的发展至关重要。通过将化学还原的 Ag 离子沉积在静电纺丝 TiO2 纳米纤维（TiO2 NF）的表面上，合成了纳米银修饰的 TiO2 纳米纤维（Ag@TiO2 NF）。用 PVP 作为偶联剂，将制备的 Ag@TiO2 NF 涂覆上 SiO2（SiO2@Ag@TiO2 NF），以保护 Ag 纳米颗粒免受 I(-)/I3(-)溶液的腐蚀。所制备的 SiO2@Ag@TiO2 NF 表现出光散射和表面等离子体的协同效应，导致光吸收增强。此外，由 SiO2@Ag@TiO2 NF 结合 TiO2 纳米颗粒（NPs）组成的阳极增加了光的捕获，而不会大大牺牲染料的附着。对于厚膜（10μm），功率转换效率从 6.8%提高到 8.7%，即提高了 28%。这些结果表明，SiO2@Ag@TiO2 NF 是提高染料敏化太阳能电池中光吸收的有前途的材料。
