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首页> 外文期刊>Advanced Functional Materials >Effectively Utilizing NIR Light Using Direct Electron Injection from Up-Conversion Nanoparticles to the TiO_2 Photoanode in Dye-Sensitized Solar Cells
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Effectively Utilizing NIR Light Using Direct Electron Injection from Up-Conversion Nanoparticles to the TiO_2 Photoanode in Dye-Sensitized Solar Cells

机译：通过直接电子注入从上转换纳米粒子到染料敏化太阳能电池中的TiO_2光电阳极来有效利用NIR光

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摘要

TiO_2/NaYF_4:Yb~(3+),Er~(3+) nano-heterostructures are prepared in situ on the TiO_2 photoanode of dye-sensitized solar cells (DSCs). Transmission electron microscopy (TEM) and high-resolution (HR)-TEM confirm the formation of TiO_2/NaYF_4:Yb~(3+),Er~(3+) nano-heterostructures. The up-converted fluorescence spectrum of the photoanode containing the nano-heterostructure confirms electron injection from NaYF_4:Yb~(3+),Er~(3+) to the condution band (CB) of TiO_2. When using a photoanode containing the nano-heterostructure in a DSC, the overall efficiency (η) of the device is 17% higher than that of a device without the up-conversion nanoparticles (UCNPs) and 13% higher than that of a device containing mixed TiO_2 and UCNPs. Nano-heterostructures of TiO_2/ NaYF_4:Yb~(3+),Tm~(3+) and TiO_2/NaYF_4:Yb~(3+),Ho~(3+) can also be prepared in situ on TiO_2 photoanodes. The overall efficiency of the device containing TiO_2/ NaYF_4:Yb~(3+),Ho~(3+) nano-heterostructures is 15% higher than the control device without UCNPs. When nano-heterostructures of TiO_2/NaYF_4:Yb~(3+),Tm~(3+) are used, the open-circuit voltage (V_(oc)) and the short-circuit current density (J_(oc)) are all slightly decreased. The effect of the different UCNPs results from the different energy levels of Er~(3+), Tm~(3+), and Ho~(3+). These results demonstrate that utilizing the UCNPs with the apporpriate energy levels can lead to effective electron injection from the UCNPs to the CB of TiO_2, effectively improving the photocurrent and overall efficiency of DSCs while using NIR light.
机译：在染料敏化太阳能电池（TiOC）的TiO_2光阳极上原位制备了TiO_2 / NaYF_4：Yb〜（3 +），Er〜（3+）纳米异质结构。透射电镜（TEM）和高分辨率（HR）-TEM证实了TiO_2 / NaYF_4：Yb〜（3 +），Er〜（3+）纳米异质结构的形成。含有纳米异质结构的光阳极的上转换荧光光谱证实了从NaYF_4：Yb〜（3 +），Er〜（3+）向TiO_2的导电带（CB）注入电子。当在DSC中使用包含纳米异质结构的光电阳极时，该器件的整体效率（η）比不含上转换纳米粒子（UCNP）的器件的整体效率（η）高17％，比包含该器件的整体效率（η）高13％混合的TiO_2和UCNPs。 TiO_2 / NaYF_4：Yb〜（3 +），Tm〜（3+）和TiO_2 / NaYF_4：Yb〜（3 +），Ho〜（3+）的纳米异质结构也可以在TiO_2光阳极上原位制备。含有TiO_2 / NaYF_4：Yb〜（3 +），Ho〜（3+）纳米异质结构的器件的总效率比不含UCNPs的对照器件高15％。当使用TiO_2 / NaYF_4：Yb〜（3 +），Tm〜（3+）的纳米异质结构时，开路电压（V_（oc））和短路电流密度（J_（oc））为全部略有下降。不同的UCNPs的作用是由Er〜（3 +），Tm〜（3+）和Ho〜（3+）的不同能级引起的。这些结果表明，利用具有适当能级的UCNP可以导致从UCNP向TiO_2的CB的有效电子注入，从而在使用近红外光的同时有效地改善了DSC的光电流和整体效率。

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  • 来源
    《Advanced Functional Materials》 |2013年第47期|5910-5915|共6页
  • 作者

    Jie Chang; Yanhui Ning; Suli Wu; Wenbin Niu; Shufen Zhang;

  • 作者单位

    State Key Laboratory of Fine Chemicals Dalian University of Technology (DUT) Dalian, 116024, China;

    State Key Laboratory of Fine Chemicals Dalian University of Technology (DUT) Dalian, 116024, China;

    State Key Laboratory of Fine Chemicals Dalian University of Technology (DUT) Dalian, 116024, China;

    State Key Laboratory of Fine Chemicals Dalian University of Technology (DUT) Dalian, 116024, China;

    State Key Laboratory of Fine Chemicals Dalian University of Technology (DUT) Dalian, 116024, China;

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