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首页> 外文会议>Nanostructured metal oxides for advanced applications >Multipodal and Multilayer TiO_2 Nanotube Arrays: Hierarchical Structures for Energy Harvesting and Sensing
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Multipodal and Multilayer TiO_2 Nanotube Arrays: Hierarchical Structures for Energy Harvesting and Sensing

机译：多足和多层TiO_2纳米管阵列：能量收集和传感的分层结构。

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摘要

Our ability to fabricate multipodal and multilayer TiO_2 nanotube arrays enables us to increase performance and functionality in light harvesting devices such as excitonic solar cells and photocatalysts. Using a combination of simulations and experiments, we show that multilayer nanotube arrays enable photon management in the active toward enhancing the absorption and utilization of incident light. We show that the simultaneous utilization of TiO_2 nanotubes with large (～450 nm) and small (～80 nm) diameters in stacked multilayer films increased light absorption and photocurrent in solar cells. Such enhanced light absorption is particularly desirable in the near-infrared region of the solar spectrum in which most excitonic solar cells suffer from poor quantum efficiencies and for blue photons at the TiO_2 band-edge where significant room exists for improvement of photocatalytic quantum yields. Under AM 1.5 one sun illumination, multilayer nanotube arrays afforded us an approximately 20% improvement in photocurrent over single layer nanotube array films of the same thickness for N-719 sensitized liquid junction solar cells. Also, the possibility of multipodal TiO_2 nanotube growth with different electrolyte recipes is presented.
机译：我们具有制造多足和多层TiO_2纳米管阵列的能力，使我们能够提高光收集设备（如激子太阳能电池和光催化剂）的性能和功能。使用模拟和实验的组合，我们显示出多层纳米管阵列可以在活性物质中实现光子管理，从而增强入射光的吸收和利用。我们表明，在多层堆叠膜中同时利用直径大（〜450 nm）和小直径（〜80 nm）的TiO_2纳米管可提高太阳能电池的光吸收和光电流。这样的增强的光吸收在太阳光谱的近红外区域中是特别期望的，在该太阳光谱中，大多数激子太阳能电池遭受差的量子效率，并且对于存在显着改善光催化量子产率的空间的TiO_2带边缘处的蓝色光子。在AM 1.5下，一个阳光照射下，与N-719敏化液结太阳能电池相同厚度的单层纳米管阵列膜相比，多层纳米管阵列使我们的光电流提高了约20％。此外，还提出了采用不同电解质配方生长多足形TiO_2纳米管的可能性。

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  • 会议地点 San Francisco CA(US)
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    Arash Mohammadpour; Samira Farsinezhad; Ling-Hsuan Hsieh; Karthik Shankar;

  • 作者单位

    Department of Electrical and Computer Engineering, University of Alberta, 9107 - 116 St, Edmonton, AB T6G 2V4, Canada;

    Department of Electrical and Computer Engineering, University of Alberta, 9107 - 116 St, Edmonton, AB T6G 2V4, Canada;

    Department of Electrical and Computer Engineering, University of Alberta, 9107 - 116 St, Edmonton, AB T6G 2V4, Canada;

    Department of Electrical and Computer Engineering, University of Alberta, 9107 - 116 St, Edmonton, AB T6G 2V4, Canada,National Institute for Nanotechnology, National Research Council, 11421 Saskatchewan Drive, Edmonton, AB, T6G 2M9, Canada;

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