Jung, HS and Lee, JK and Nastasi, M and Lee, SW and Kim, JY and Park, JS and Hong, KS and Shin, H
(2005)
Preparation of nanoporous MgO-coated TiO <inf>2</inf> nanoparticles and their application to the electrode of dye-sensitized solar cells.
Langmuir, 21 (23).
10332 - 10335.
ISSN 0743-7463
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Abstract
Sol-gel-derived Mg(OH) 2 gel was coated onto TiO 2 nanoparticles, and the subsequent thermal topotactic decomposition of the gel formed a highly nanoporous MgO crystalline coating. The specific surface area of the electrode that was prepared from the core-shell-structured TiO 2 nanoparticles significantly increased compared with that of the uncoated TiO 2 electrode. The increase in the specific surface area of the MgO-coated TiO 2 electrode was attributed to the highly nanoporous MgO coating layer that resulted from the topotactic reaction. Dye adsorption behavior and solar cell performance were significantly enhanced by employing the MgO-coated TiO 2 electrode. Optimized coating of a MgO layer on TiO 2 nanoparticles enhanced the energy conversion efficiency as much as 45% compared to that of the uncoated TiO 2 electrode. This indicates that controlling the extrinsic parameters such as the specific surface area is very important to improve the energy conversion efficiency of TiO 2-based solar cells. © 2005 American Chemical Society.
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