Smooth TiO2 Thin Films Grown by Aqueous Spray Deposition for Long-Wave Infrared Applications
| Autor: | Evan M. Smith, Justin W. Cleary, Imen Rezadad, Sarmad Fawzi Hamza Alhasan, Robert E. Peale, Isaiah O. Oladeji, Vanessa C. Lowry, Hussain Abouelkhair, Seth Calhoun |
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| Rok vydání: | 2018 |
| Předmět: |
Anatase
Materials science business.industry Infrared Mechanical Engineering Physics::Optics 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 010309 optics Condensed Matter::Materials Science Mechanics of Materials 0103 physical sciences Dispersion (optics) Surface roughness Deposition (phase transition) Optoelectronics General Materials Science Direct and indirect band gaps Thin film 0210 nano-technology business |
| Zdroj: | MRS Advances. 3:255-260 |
| ISSN: | 2059-8521 |
| Popis: | Self-assembled TiO2 films deposited by aqueous-spray deposition were investigated to evaluate morphology, crystalline phase, and infrared optical constants. The Anatase nano-crystalline film had ∼10 nm characteristic surface roughness sparsely punctuated by defects of not more than 200 nm amplitude. The film is highly transparent throughout the visible to wavelengths of 12 μm. The indirect band gap was determined to be 3.2 eV. Important for long-wave infrared applications is that dispersion in this region is weak compared with the more commonly used dielectric SiO2 for planar structures. An example application to a metal-insulator-metal resonant absorber is presented. The low-cost, large-area, atmospheric-pressure, chemical spray deposition method allows conformal fabrication on flexible substrates for long-wave infrared photonics. |
| Databáze: | OpenAIRE |
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