Preparing core–shell structure of ZnO@TiO2 nanowires through a simple dipping–rinse–hydrolyzation process as the photoanode for dye-sensitized solar cells
Preparing core–shell structure of ZnO@TiO2 nanowires through a simple dipping–rinse–hydrolyzation process as the photoanode for dye-sensitized solar cells
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DOI：
10.1016/j.nanoen.2013.07.013
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发表时间：
2013-09
期刊：
影响因子：
17.6
通讯作者：
Min-Hsin Yeh;Lu-Yin Lin;Chen-Yu Chou;Chuan-Pei Lee;Hui-Min Chuang;R. Vittal;K. Ho
中科院分区：
文献类型：
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作者：
Min-Hsin Yeh;Lu-Yin Lin;Chen-Yu Chou;Chuan-Pei Lee;Hui-Min Chuang;R. Vittal;K. Ho
ZnO对酸性染料分子的化学稳定性是染料敏化太阳能电池（DSSC）中需要提高的一个重要问题。在这项研究中，通过化学浴沉积在FTO玻璃上制备ZnO纳米线（ZnO-NWs），然后使用简单的浸渍-漂洗-水解（DRH）工艺在ZnO-NWs表面精确涂覆一层薄薄的TiO2层，形成ZnO@TiO2纳米线（ZnO@TiO2-NWs）的核壳结构，以改善 ZnO 的化学稳定性。 FTO 玻璃上的 ZnO@TiO2-NWs 核壳结构进一步用作 DSSC 的光电阳极，并以酸性 N3 染料作为敏化剂。 TiO2壳不仅充当保护层，避免在ZnO-NWs表面形成Zn2+/染料复合物，而且还充当屏障，防止注入电子与ZnO-NWs和电解质界面处的三碘化物离子复合。与采用原始 ZnO-NWs 的优化电池 (0.75%) 相比，具有优化的染料敏化时间和 DRH 循环的基于核壳 ZnO@TiO2-NWs 的 DSSC 实现了 1.17% 的更高效率。
The chemical stability of ZnO against acidic dye molecules is an important issue to be improved in a dye-sensitized solar cell (DSSC). In this study, ZnO nanowires (ZnO-NWs) are prepared on a FTO glass through chemical bath deposition, and then the surface of ZnO-NWs are precisely coated with a thin TiO2layer step by step using a simple dipping–rinse–hydrolyzation (DRH) process to create the core–shell structure of ZnO@TiO2nanowires (ZnO@TiO2-NWs) for improving the chemical stability of ZnO. This core–shell structure of ZnO@TiO2-NWs on a FTO glass is further used as the photoanode of a DSSC with an acidic N3 dye as sensitizer. The TiO2shell acts not only as a protective layer to avoid the formation of Zn2+/dye complexes on the surface of ZnO-NWs, but also as a barrier against the recombination of injected electrons with the triiodide ions at the interface of ZnO-NWs and the electrolyte. A higher efficiency of 1.17% is achieved for the core–shell ZnO@TiO2-NWs based DSSC with optimized dye sensitization time and DRH cycles, when compared to the optimized cell with pristine ZnO-NWs (0.75%).