期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 20, 页码 9872-9877出版社
AMER CHEMICAL SOC
DOI: 10.1021/am402344d
关键词
hydrothermal deposition; electrochemical deposition; nanowires; TiO2; cobalt(II/III) electrolyte; dye-sensitized solar cells
资金
- European Regional Development Funds
- Spanish MICINN [MAT2010-15138, MAT2010-21510, CSD2009-00050]
- FI-DGR grant from the Agencia de Gestio d'Ajuts Universitaris i de Recerca (AGAUR) from the Catalan Government
- ICREA Funding Source: Custom
The growth of a TiO shell at the surface of TiO2 nanowires (NWs) allowed us to improve the power conversion efficiency of NW-based dye-sensitized solar cells (DSCs) by a factor 2.5. TiO2@TiO core-shell NWs were obtained by a two-step process: First, rutile-phase TiO2 NWs were hydrothermally grown. Second, a hongquiite-phase TiO shell was electrochemically deposited at the surface of the TiO2 NWs. Bare TiO2 and heterojunction TiO2@TiO NW-based DSCs were obtained using a cobalt(II/III) redox electrolyte and LEG4 as the dye. With this electrolyte/dye combination, DSCs with outstanding V-oc values above 900 mV were systematically obtained. While TiO2@TiO NW-based DSCs had slightly lower V-oc values than bare TiO2 NW-based DSCs, they provided 3-fold higher photocurrents, overall reaching 2.5-fold higher power conversion efficiencies. The higher photocurrents were associated with the larger surface roughness and an enhanced charge-carrier separation/transfer at the NW/dye interface.
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