Inducing a Nanotwinned Grain Structure within the TiO2 Nanotubes Provides Enhanced Electron Transport and DSSC Efficiencies >10%

Advanced Energy Materials - Tập 8 Số 33 - 2018
Seulgi So1,2, Imgon Hwang2, JeongEun Yoo2, Shiva Mohajernia2, Mirza Mačković3, Erdmann Spiecker3, Gihoon Cha2, Anca Mazare2, Patrik Schmuki4,2
1Department of Chemistry, University of California, Irvine, CA 92697, USA
2Department of Materials Science and Engineering, WW4-LKO, University of Erlangen-Nuremberg, Martensstrasse 7, D-91058 Erlangen, Germany
3Department of Materials Science and Engineering, Institute of Micro- and Nanostructure Research and Center for Nanoanalysis and Electron Microscopy, Cauerstr 6, D-91058 Erlangen, Germany
4Chemistry Department, Faculty of Sciences, King Abdulaziz University, 80203 Jeddah, Saudi Arabia

Tóm tắt

AbstractTitania is one of the key materials used in 1D, 2D, and 3D nanostructures as electron transport media in energy conversion devices. In the present study, it is shown that the electronic properties of TiO2 nanotubes can be drastically improved by inducing a nanotwinned grain structure in the nanotube wall. This structure can be exclusively induced for “single‐walled” nanotubes with a high‐temperature treatment in pure oxygen atmospheres. Nanotubes with a twinned grain structure within the tube wall show a strongly enhanced conductivity and photogenerated charge transport compared to classic nanotubes. This remarkable improvement is exemplified in the electronic properties by using nanotwinned TiO2 nanotubes in dye‐sensitized solar cells where a significant increase in efficiency of up to 10.2% is achieved.

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Advanced Energy Materials

Tập 8 Số 33

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