A multijunction of ZnIn2S4 nanosheet/TiO2 film/Si nanowire for significant performance enhancement of water splitting  

作　　者：Qiong Liu Fangli Wu Fengren Cao Lei Chen Xinjian Xie Weichao Wang Wei Tian Liang Li 

机构地区：[1]College of Physics, Optoelectronics and Energy, Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006, China [2]Department of Electronics, Tianjin Key Laborotory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 370001, China

出　　处：《Nano Research》2015年第11期3524-3534,共11页纳米研究（英文版）

基　　金：Acknowledgements This work was supported by the National Natural Science Foundation of China （Nos. 51422206 and 51372159）, 1000 Talents Plan for Young Researchers, ＂Shuangchuang＂ Program of Jiangsu Province, a Project Supported by Jiangsu Science and Technology Committee for Distinguished Young Scholars （No. BK20140009）, the National Basic Research Program of China （973 Program） （No. 2015CB358600） and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions （PAPD）. We also acknowledge Jiangsu Nata Opto- electronic Materials Co. Ltd. for providing high purity TDMAT precursor for deposition of TiO2 thin films.

摘　　要：Photoelectrodes with a specific structure and composition have been proposed for improving the efficiency of solar water splitting. Here, a novel multijunction structure was fabricated, with Si nanowires as cores, ZnIn2S4 nanosheets as branches, and TiO2 films as sandwiched layers. This junction exhibited a superior photoelectrochemical performance with a maximum photoconversion efficiency of 0.51%, which is 795 and 64 times higher than that of a bare Si wafer and nanowires, respectively. The large enhancement was attributed to the effective electron-hole separation and fast excited carrier transport within the multijunctions resulting from their favorable energy band alignments with water redox potentials, and to the enlarged contact area for facilitating the electron transfer at the multijunction/electrolyte interface.有特定的结构和作文的 Photoelectrodes 为改进切开的太阳的水的效率被建议了。这里，新奇 multijunction 结构被制作，与象核心的 Si nanowires， ZnIn <sub>2</sub > 作为分支，和 TiO， ₂ 是夹了层拍摄的 S ₄ nanosheets。这个连接与 0.51% 的最大的 photoconversion 效率展出了优异 photoelectrochemical 表演，它分别地比赤裸的 Si 晶片和 nanowires 的高 795 和 64 倍。大改进为在 multijunction/electrolyte 接口便于电子转移在与水氧化还原作用潜力源于他们的有利精力乐队排列的 multijunctions 以内被归因于有效 electronhole 分离和快激动的搬运人运输，并且到扩大接触区域。

关 键 词：water splitting photoelectrochemical cells NANOSHEETS atomic layer deposition multi junction 

分 类 号：TN304.12[电子电信—物理电子学] O643.36[理学—物理化学]