Electron mobility and trapping in TiO2 nanotubes revealed by time-resolved THz spectroscopy

Christiaan Richter*, Charles A. Schmuttenmaer

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


In the last two decades nanoparticle films have emerged as a low cost high surface-area material forming the basis of promising dye-sensitized solar cells for the production of either electricity or solar fuels. A drawback of using sintered nanoparticle films as photoelectrodes is that these films have low electron mobilities. Oriented polycrystalline titania nanotubes could well be a cost effective alternative. However, recent macroscopic measurements found electron transport through nanotube and nanoparticle films to be comparable. Here we show that low electron mobility in polycrystalline TiO2 nanotubes is not due to scattering from grain boundaries but instead due to traps that manifest themselves in a single sharp resonance in the THz spectrum. These spectroscopic results also give an unprecedented characterization of the shallow electronic defect structure of anatase TiO2. The TiO2 nanotube spectra are fundamentally and qualitatively different than that for nanoparticles or the bulk material.

Original languageEnglish
JournalACS National Meeting Book of Abstracts
Publication statusPublished - 2010
Event239th ACS National Meeting and Exposition - San Francisco, CA, United States
Duration: 21 Mar 201025 Mar 2010


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