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首页> 外文期刊>ECS Journal of Solid State Science and Technology >Immobilization of Silver Nanoparticles by Peptide Nucleic Acids in Surface Plasmon Enhanced Dye-Sensitized Solar Cells
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Immobilization of Silver Nanoparticles by Peptide Nucleic Acids in Surface Plasmon Enhanced Dye-Sensitized Solar Cells

机译：肽核酸在表面等离激元增强染料敏化太阳能电池中固定化银纳米粒子

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摘要

Light absorption of dye molecules can be increased by the localized surface plasmons of silver nanoparticles (AgNPs), which can be used to enhance the photocurrent generation of dye-sensitized solar cells (DSSCs). Simultaneously, however, reverse electron transfer from the TiO_2 working electrode to the I_3~-/I~- electrolyte is also increased. In this work, peptide nucleic acid (PNA) was successfully used to immobilize AgNPs at different distances from the TiO_2 layer and dye molecules. Together with results from previous studies, results here reveal that the optimal distance is between the lengths of possibly bent 2-nm alkane-thiols and 3.2- to 4.2-nm PNA. AgNPs immobilized by hybridization of PNA of this length lead to an increase in energy conversion efficiency from 3.1% to 4.0%. Furthermore, PNA forms π-electron stacks upon hybridization, which can reduce reverse electron transfer. With double-stranded PNA, the internal quantum efficiency of DSSCs could be increased more than 10%, from 73% to 88%, with 5.8- to 6.8-nm long double-stranded PNA.
机译：银纳米颗粒（AgNPs）的局部表面等离子体激元可以增加染料分子的光吸收，可用于增强染料敏化太阳能电池（DSSCs）的光电流生成。但是同时，从TiO_2工作电极到I_3〜-/ I〜-电解质的反向电子转移也增加了。在这项工作中，成功地使用了肽核酸（PNA）将AgNP固定在距TiO_2层和染料分子不同距离处。结合以前的研究结果，这里的结果表明，最佳距离是在可能弯曲的2纳米链烷硫醇与3.2纳米至4.2纳米PNA的长度之间。通过这种长度的PNA杂交固定化的AgNPs导致能量转换效率从3.1％增加到4.0％。此外，PNA在杂交时形成π电子叠层，这可以减少反向电子转移。使用双链PNA，可以将DSSC的内部量子效率提高10％以上，从73％提高到88％，并使用5.8-6.8 nm长的双链PNA。

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