1. Electron Kinetics in Dye Sensitized Solar Cells Employing Anatase with (1 0 1) and (0 0 1) Facets.
- Author
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Laskova, Barbora, Moehl, Thomas, Kavan, Ladislav, Zukalova, Marketa, Liu, Xianjie, Yella, Aswani, Comte, Pascal, Zukal, Arnost, Nazeeruddin, Mohammad Khaja, and Graetzel, Michael
- Subjects
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ELECTRON kinetic energy , *DYES & dyeing , *SOLAR cells , *TITANIUM dioxide , *NANOCRYSTALS , *PHOTOCURRENTS , *CAPACITANCE-voltage characteristics - Abstract
Two phase-pure nanocrystalline anatase materials differing in the exposed crystal facets (0 0 1) or (1 0 1) are studied by electrochemical impedance spectroscopy and by transient photovoltage and photocurrent decay in dye sensitized solar cells. A larger chemical capacitance, indicating larger density of states, is observed for anatase (0 0 1). The presence of deep electron traps in (0 0 1) nanosheets is further confirmed by optical (UV-Vis) and photoemission (XPS, UPS) spectra. The difference in chemical capacitance indicates a slower diffusion of electrons in the (0 0 1) anatase material, but also a higher electron lifetime compared to (1 0 1) anatase material. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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