Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 15, Pages 18032-18038Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.07.005
Keywords
Dye-sensitized solar cells; Nanobelts; Doped titania; Composite anode
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Funding
- Ministry of Science and Technology in Taiwan [MOST 103-2221-E-224-076]
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Niobium (Nb) and iron (Fe) co-doped titanium oxide nanobelts were prepared in a one-pot alkaline hydro thermal process followed by calcination treatment, and evaluated in TiO2 nanoparticle-based composite anodes for dye-sensitized solar cells. Addition of Nb and Fe species caused an increase in donor density and trap mediated charge transition, as characterized by electrochemical and photoluminescence analyses. Under illumination with simulated solar light, the co-doped single-crystalline nanobelts promoted photocurrent yield and open-circuit voltage, because they facilitate electronic conduction and chemical capacitance in the composite anodes. This improved photovoltaic performance is associated with the enhanced charge collection efficiency, mechanistically attributed to rapid electron transport and prolonged electron lifetime via shallow trapping sites. Results demonstrate that the Nb and Fe co-doped titania nanobelts are effective to provide longer electron diffusion lengths and favor charge accumulation during cell operation.
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