4 years ago

Freeze Drying as a Novel Approach to Improve Charge Transport in Titanium Dioxide Nanorod Arrays

Freeze Drying as a Novel Approach to Improve Charge Transport in Titanium Dioxide Nanorod Arrays
Xiaohua Ma, Peng Zhong, Yimin Lei, He Xi, Xinpeng Chen
Ordered TiO2 nanostructure arrays, such as hydrothermal nanorod arrays (NRAs) and anodic nanotube arrays, have attracted great attention in solar cells, photocatalysis, and so on, mainly owing to their vertically aligned 1D architectures. However, the device performances are limited by their poor electronic properties, owing to the morphology collapse and surface adsorbates. In this work, a novel freeze-drying technique has been used to post-treat hydrothermal TiO2 NRAs. The freeze-drying treatment not only leads to a well-preserved nanoarray morphology, but also induces complete removal of adsorbed chlorine on the TiO2 surface. The light-scattering feature and the energy band structure have thus changed after freeze drying as compared to common air drying. As a result, the charge transfer at the TiO2/electrolyte interface and the collection efficiency of photo-excited electrons through the TiO2 NRAs are substantially improved, leading to the performance enhancement of model solar cells. Array of sunshine: A novel freeze-drying treatment leads to vertically aligned TiO2 nanorod arrays and removes the chlorine adsorbed on TiO2 surfaces simultaneously, substantially improving the electronic properties of the hydrothermal TiO2 nanorods and the performances of solar cells.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700572

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