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首页> 外文期刊>CERAMICS INTERNATIONAL >KrF excimer laser irradiated nanoporous TiO_2 layers for dye-sensitized solar cells: Influence of laser power density
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KrF excimer laser irradiated nanoporous TiO_2 layers for dye-sensitized solar cells: Influence of laser power density

机译：染料敏化太阳能电池用KrF准分子激光辐照纳米多孔TiO_2层：激光功率密度的影响

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摘要

This paper reports the performance of dye-sensitized solar cells (DSSCs) with nanoporous TiO_2 photoanodes irradiated by KrF excimer laser beams of various power densities. The laser induces surface remelting and solidification to create textures on the TiO_2 layers. After laser irradiation, TiO_2 also undergoes a phase transition from anatase to rutile;;the amount of the transformed phase increases with the laser power density. For dye-anchored TiO_2 layers, light absorption increases first and then decreases as the laser power density increases. The assembled cell efficiency, strongly correlated with the photocurrent density, also increases first and then decreases as the laser power density rises. This indicates that laser treatment creates surface textures on TiO_2 that improve light trapping in the dye-anchored TiO_2 photoanodes, thereby increasing the photocurrent level and cell efficiency. For high laser irradiation power density, the ablation of the TiO_2 layer becomes significant, leading to a decrease in cell efficiency. The surface remelting and solidification process reduces the density of the surface recombination centers on TiO_2, resulting in an increase of open-circuit voltage.
机译：本文报道了不同功率密度的KrF准分子激光束照射的纳米多孔TiO_2光阳极的染料敏化太阳能电池（DSSC）的性能。激光引起表面重熔和凝固，从而在TiO_2层上产生纹理。激光辐照后，TiO_2也经历了从锐钛矿到金红石的相变;相变的数量随着激光功率密度的增加而增加。对于染料锚定的TiO_2层，随着激光功率密度的增加，光吸收率先增大，然后减小。与光电流密度密切相关的组装电池效率，也会随着激光功率密度的上升而先上升然后下降。这表明激光处理在TiO_2上产生了表面纹理，从而改善了染料锚定的TiO_2光电阳极中的光捕获，从而提高了光电流水平和电池效率。对于高激光照射功率密度，TiO 2层的烧蚀变得显着，导致电池效率降低。表面重熔和凝固过程降低了TiO_2上的表面复合中心的密度，导致开路电压增加。

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