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首页> 外文期刊>Advanced Functional Materials >Heterojunction Engineering of CdTe and CdSe Quantum Dots on TiO_2 Nanotube Arrays: Intricate Effects of Size- Dependency and Interfacial Contact on Photoconversion Efficiencies
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Heterojunction Engineering of CdTe and CdSe Quantum Dots on TiO_2 Nanotube Arrays: Intricate Effects of Size- Dependency and Interfacial Contact on Photoconversion Efficiencies

机译：TiO_2纳米管阵列上CdTe和CdSe量子点的异质结工程：尺寸依赖性和界面接触对光转换效率的复杂影响

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摘要

The quality of heterojunctions at the quantum dot (QD)-TiO_2 nanotube (TNT) interface has important implications on the efficiencies of photo-electrochemical solar cells. Here, it is shown that electrophoretic deposition of pre-synthesized thioacid-capped CdTe QDs results in relatively poor charge transfer across the heterojunctions. This is likely due to the intermediate layer of bifunctional linkers (S-R-COOH) in between the QDs and TNT. On the other hand, CdTe QD-sensitized TNT prepared by in situ deposition in aqueous medium provides direct QD-TNT contact, and hence more favorable heterojunction for charge transfer. This is exemplified not only by the drastic improvement in photocurrent efficiencies, but also provides clear difference on the size-dependent electron injection efficiencies from the CdTe QDs of different sizes. By extending the system further to CdSe QDs, drastic enhancement is found when carrying out the in situ deposition in an organic medium. The results are discussed in terms of the nature of deposition and the corresponding charge transport characteristics. More importantly, the work reflects the intricacy of the effects of QD size and the quality of the heterojunctions on the overall photoconversion efficiencies.
机译：量子点（QD）-TiO_2纳米管（TNT）界面处的异质结质量对光电化学太阳能电池的效率具有重要意义。在此，显示了预先合成的巯基酸封端的CdTe QD的电泳沉积导致跨异质结的电荷转移相对较差。这可能是由于QD和TNT之间存在双功能连接子（S-R-COOH）的中间层。另一方面，通过在水介质中原位沉积制备的CdTe QD敏化的TNT提供了直接的QD-TNT接触，因此更有利于电荷转移的异质结。这不仅可以通过光电流效率的显着提高来举例说明，而且可以提供与不同尺寸的CdTe QD尺寸相关的电子注入效率的明显差异。通过将系统进一步扩展到CdSe QD，可以在有机介质中进行原位沉积时获得极大的增强。根据沉积的性质和相应的电荷传输特性讨论了结果。更重要的是，这项工作反映了量子点尺寸和异质结质量对整体光转换效率的影响的复杂性。

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  • 来源
    《Advanced Functional Materials》 |2012年第13期|p.2821-2829|共9页
  • 作者

    Haihua Yang; Wenguang Fan; Aleksandar Vaneski; Andrei S. Susha; Wey Yang Teoh; Andrey L Rogach;

  • 作者单位

    Department of Physics and Materials Science and Centre for Functional Photonics (CFP) City University of Hong Kong Tat Chee Avenue, Kowloon, Hong Kong SAR;

    Clean Energy and Nanotechnology (CLEAN) Laboratory School of Energy and Environment City University of Hong Kong Shatin, N. T., Hong Kong SAR;

    Department of Physics and Materials Science and Centre for Functional Photonics (CFP) City University of Hong Kong Tat Chee Avenue, Kowloon, Hong Kong SAR;

    Department of Physics and Materials Science and Centre for Functional Photonics (CFP) City University of Hong Kong Tat Chee Avenue, Kowloon, Hong Kong SAR;

    Clean Energy and Nanotechnology (CLEAN) Laboratory School of Energy and Environment City University of Hong Kong Shatin, N. T., Hong Kong SAR;

    Department of Physics and Materials Science and Centre for Functional Photonics (CFP) City University of Hong Kong Tat Chee Avenue, Kowloon, Hong Kong SAR;

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