Hydrothermal synthesis of Fe and Nb-doped titania nanobelts and their tunable electronic structure toward photovoltaic application
| Autor: | Chien-Tsung Wang, Hong-Syuan Lin, Wei-Ping Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Dopant Mechanical Engineering Doping Niobium Oxide chemistry.chemical_element 02 engineering and technology Electronic structure 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Anode chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials 0103 physical sciences Hydrothermal synthesis General Materials Science Charge carrier 0210 nano-technology |
| Zdroj: | Materials Science in Semiconductor Processing. 99:85-91 |
| ISSN: | 1369-8001 |
| DOI: | 10.1016/j.mssp.2019.04.019 |
| Popis: | One-dimensional (1D) oxide nanostructures have been widely investigated to find novel properties. The study prepared titania nanobelts doped with iron (Fe) and niobium (Nb) at ultralow concentrations by one-step hydrothermal synthesis and post-calcination, and explored their electronic structure by spectroscopic and electrochemical analyses. The Fe and Nb doping generated Ti3+ donor levels and trap states as well as induced band-edge shift. The doped nanobelts produced higher photocurrents and quantum efficiencies, when evaluated as anode materials in dye-sensitized solar cells. Formation of the shallow states exerts a major influence on charge carrier diffusion in titania nanobelts, because of their roles as photoactive sites to facilitate electron transport via hopping and trapping/de-trapping events. The Fe and Nb dopants have a synergistic effect in the electronic conduction by increasing electron density and lifetime. Results demonstrate a feasibility of using aliovalent substitution by co-dopants to tailor extrinsic 1D oxide semiconductors. |
| Databáze: | OpenAIRE |
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