ZnO/ZnSxSe1−x core/shell nanowire arrays as photoelectrodes with efficient visible light absorption
ZnO/ZnSxSe1−x core/shell nanowire arrays as photoelectrodes with efficient visible light absorption
复制标题
DOI：
10.1063/1.4745918
复制
发表时间：
2012-08
影响因子：
4
通讯作者：
Zhenxing Wang;Xueying Zhan;Yajun Wang;M. Safdar;Mutong Niu;Jinping Zhang;Ying Huang;Jun He
中科院分区：
文献类型：
--
作者：
Zhenxing Wang;Xueying Zhan;Yajun Wang;M. Safdar;Mutong Niu;Jinping Zhang;Ying Huang;Jun He
采用两步化学气相沉积法在n+型硅衬底上制备了ZnO/ZnSxSe 1 −x核/壳纳米线。透射电子显微镜观察表明，ZnS xSe 1 −x可以沉积在ZnO纳米线的整个表面，形成沿着ZnO纳米线的同轴异质结，具有非常光滑的壳层表面和高度的壳层厚度均匀性。沉积三元合金壳后的光电极显著提高了可见光吸收效率。电化学阻抗谱结果明确表明，ZnS xSe 1 −x壳层的ZnO纳米线的引入有效地改善了光生电荷分离过程。我们的发现为实现高效能量转换装置开辟了有效手段。
ZnO/ZnSxSe1−x core/shell nanowires have been synthesized on n+-type silicon substrate via a two-step chemical vapor deposition method. Transmission electron microscopy reveals that ZnSxSe1−x can be deposited on the entire surface of ZnO nanowire, forming coaxial heterojunction along ZnO nanowire with very smooth shell surface and high shell thickness uniformity. The photoelectrode after deposition of the ternary alloy shell significantly improves visible light absorption efficiency. Electrochemical impedance spectroscopy results explicitly indicate that the introduction of ZnSxSe1−x shell to ZnO nanowires effectively improves the photogenerated charge separation process. Our finding opens up an efficient means for achieving high efficient energy conversion devices.