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Smooth TiO2 Thin Films Grown by Aqueous Spray Deposition for Long-Wave Infrared Applications

Published online by Cambridge University Press:  11 January 2018

Sarmad Fawzi Hamza Alhasan
Affiliation:
Electrical and Computer Engineering, University of Central Florida, Orlando, FL 32816-2362, USA Laser and Optoelectronics Engineering, University of Technology, Baghdad IRAQ.
Seth R. Calhoun
Affiliation:
Physics, University of Central Florida, Orlando FL 32816-2385 USA
Hussain Abouelkhair
Affiliation:
Physics, University of Central Florida, Orlando FL 32816-2385 USA
Vanessa C. Lowry
Affiliation:
Physics, University of Central Florida, Orlando FL 32816-2385 USA
Robert E. Peale
Affiliation:
Physics, University of Central Florida, Orlando FL 32816-2385 USA
Imen Rezadad
Affiliation:
NanoSpective Inc, 12565 Research Parkway, Ste. 390, Orlando FL 32826 USA
Evan M. Smith
Affiliation:
KBRWyle, Beavercreek OH 45431 USA. Air Force Research Laboratory, Sensors Directorate, Wright-Patterson AFB OH 45433, USA
Justin W. Cleary
Affiliation:
Air Force Research Laboratory, Sensors Directorate, Wright-Patterson AFB OH 45433, USA
Isaiah O. Oladeji
Affiliation:
SISOM Thin Films LLC, 1209 West Gore Street, Orlando, FL 32805, USA. info@sisomtf.com
Corresponding
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Abstract

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.

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Copyright
Copyright © Materials Research Society 2018 

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