An upconversion NaYF4:Yb3+,Er3+/TiO2 core–shell nanoparticle photoelectrode for improved efficiencies of dye-sensitized solar cells
An upconversion NaYF4:Yb3+,Er3+/TiO2 core–shell nanoparticle photoelectrode for improved efficiencies of dye-sensitized solar cells
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DOI：
10.1016/j.jpowsour.2012.10.073
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发表时间：
2013-03
影响因子：
9.2
通讯作者：
Jun Zhang;H. Shen;Wei Guo;Shun Wang;Chun Zhu;Fang Xue;J. Hou;Haiquan Su;Zhuo-bin Yuan-Zhuo-bin-Yu
中科院分区：
文献类型：
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作者：
Jun Zhang;H. Shen;Wei Guo;Shun Wang;Chun Zhu;Fang Xue;J. Hou;Haiquan Su;Zhuo-bin Yuan-Zhuo-bin-Yu
合成了新型上转换NaYF4：Yb3+，Er3+/TiO2核壳纳米粒子(NPs)，并将其用于制备染料敏化太阳能电池的光电极(PE)。用透射电子显微镜、X射线衍射仪、上转换发光(UCL)荧光光谱和电化学等方法研究了NaYF4：Yb3+，Er3+/TiO2核壳纳米粒子的形貌、结构、光致发光特性以及其光电性能和交流阻抗谱。与纯的TiO2PE或NaYF4：Yb3+，Er3+上转换纳米粒子和TiO2简单混合制备的PE作为核壳结构的体积比相比，上转换核壳PE具有更高的光伏效率。在相同条件下，NaYF4：Yb3+，Er3+/TiO2PE复合体系的能量转换效率比纯TiO2体系提高23.1%，比混合体系提高99.1%。这一增强是由于UCL内核将DSC的光谱响应范围扩展到红外区及其特殊的壳层结构，保持了其半导体特性。这种方法代表了一种提高直接序列扩频通信效率的新方法。
Novel upconversion NaYF4:Yb3+,Er3+/TiO2core–shell nanoparticles (NPs) are synthesized and used to prepare the photoelectrode (PE) of dye-sensitized solar cells (DSSCs). The morphology, structure, photoluminescence characterization of the NaYF4:Yb3+,Er3+/TiO2core–shell NPs and the photoelectric performance, alternating current impedance spectroscopy of DSSCs are characterized using transmission electron microscopy, X-ray diffraction, upconversion luminescence (UCL) spectrofluorimetry and electrochemistry. Compared with the pure TiO2PE or the NaYF4:Yb3+,Er3+upconversion NPs and TiO2simply mixed prepared PE as the volume ratio of the core–shell structure, the DSSCs with the upconversion core–shell PE show a greater photovoltaic efficiency. The energy conversion efficiency of the DSSCs with a NaYF4:Yb3+,Er3+/TiO2PE is 23.1% higher than with a pure TiO2PE and 99.1% higher than with a mixed PE using the same conditions. This enhancement is due to the UCL core extending the spectral response range of DSSCs to the infrared region and their particular shell structure, retaining its semiconductor character. This method represents a novel approach to increase the efficiencies of DSSCs.