文献类型：期刊文献

英文题名：Ultrathin SnO2 Scaffolds for TiO2-Based Heterojunction Photoanodes in Dye-Sensitized Solar Cells: Oriented Charge Transport and Improved Light Scattering

作者：Yang, Shuang[1];Hou, Yu[1];Xing, Jun[1];Zhang, Bo[1];Tian, Feng[2];Yang, Xiao Hua[1];Yang, Hua Gui[1,3]

机构：[1]E China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China;[3]Griffith Univ, Ctr Clean Environm & Energy, Nathan, Qld 4222, Australia

年份：2013

卷号：19

期号：28

起止页码：9366

外文期刊名：CHEMISTRY-A EUROPEAN JOURNAL

收录：;EI(收录号：20132816495299);WOS:【SCI-EXPANDED(收录号:WOS:000325849000038)】；

基金：This work was supported financially by the National Natural Science Foundation of China (20973059, 91022023, 21076076, 21203061), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Shanghai Municipal Natural Science Foundation (12ZR1407500), the Major Basic Research Program of Science and Technology Commission of Shanghai Municipality (10JC1403200), and the Australian Research Council's Future Fellowships (FT120100913).

语种：英文

外文关键词：heterojunctions; photoanodes; solar cells; tin; titanium

摘要：In this paper, band-structure matching strategy of a TiO2-based heterojunction within which electrons can be collected from TiO2 nanoparticles and transported rapidly in the bulk structure is reported. On the basis of the band-structure analysis of different TiO2-based heterostructures, focus was directed to the SnO2 nanosheet because of its appropriate band position and high electrical conductivity. Through a systematic investigation of the incorporation of ultrathin SnO2 nanosheet scaffolds for TiO2-based photoanodes in dye-sensitized solar cells (DSCs), we propose an anisotropy constrained random walk model to describe the controlled electron transit process. In this system, electrons are transferred orientedly overall, as well as randomly locally, leading to a significant reduction in the charge diffusion route compared to the conventional isotropic random walk model. In brief, the 2D ultrathin nanosheets provide rapid transit pathways and improved light-scattering centers, which can ensure a sufficient amount of dye loading and slow recombination. An overall light-to-electricity conversion efficiency as high as 8.25% is achieved by embedding the appropriate amount of SnO2 scaffold in a TiO2-based photoanode.