title: Nanocolumnar Crystalline Vanadium Oxide-Molybdenum Oxide Antireflective Smart Thin Films with Superior Nanomechanical Properties.
abstract: Vanadium oxide-molybdenum oxide (VO-MO) thin (21-475 nm) films were grown on quartz and silicon substrates by pulsed RF magnetron sputtering technique by altering the RF power from 100 to 600 W. Crystalline VO-MO thin films showed the mixed phases of vanadium oxides e.g., V2O5, V2O3and VO2along with MoO3. Reversible or smart transition was found to occur just above the room temperature i.e., at ~45-50 °C. The VO-MO films deposited on quartz showed a gradual decrease in transmittance with increase in film thickness. But, the VO-MO films on silicon exhibited reflectance that was significantly lower than that of the substrate. Further, the effect of low temperature (i.e., 100 °C) vacuum (10-5mbar) annealing on optical properties e.g., solar absorptance, transmittance and reflectance as well as the optical constants e.g., optical band gap, refractive index and extinction coefficient were studied. Sheet resistance, oxidation state and nanomechanical properties e.g., nanohardness and elastic modulus of the VO-MO thin films were also investigated in as-deposited condition as well as after the vacuum annealing treatment. Finally, the combination of the nanoindentation technique and the finite element modeling (FEM) was employed to investigate yield stress and von Mises stress distribution of the VO-MO thin films.
authors.affiliation: ISRO Satellite Centre, Bangalore 560017, India.
authors.forename: Arjun
authors.initials: A
authors.lastname: Dey
authors.affiliation: ISRO Satellite Centre, Bangalore 560017, India.|Department of Metallurgical and Materials Engineering, National Institute of Technology, Warangal-506004, Telengana, India.
authors.forename: Manish Kumar
authors.initials: MK
authors.lastname: Nayak
authors.affiliation: ISRO Satellite Centre, Bangalore 560017, India.
authors.forename: A Carmel Mary
authors.initials: AC
authors.lastname: Esther
authors.affiliation: ISRO Satellite Centre, Bangalore 560017, India.|Department of Metallurgical and Materials Engineering, National Institute of Technology, Warangal-506004, Telengana, India.
authors.forename: Maurya Sandeep
authors.initials: MS
authors.lastname: Pradeepkumar
authors.affiliation: Department of Mechanical Engineering, National Institute of Technology, Durgapur, West Bengal 713 209, India.
authors.forename: Deeksha
authors.initials: D
authors.lastname: Porwal
authors.affiliation: ISRO Satellite Centre, Bangalore 560017, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Gupta
authors.affiliation: Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560 017, India.
authors.forename: Parthasarathi
authors.initials: P
authors.lastname: Bera
authors.affiliation: Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560 017, India.
authors.forename: Harish C
authors.initials: HC
authors.lastname: Barshilia
authors.affiliation: Advanced Mechanical and Materials Characterization Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India.
authors.forename: Anoop Kumar
authors.initials: AK
authors.lastname: Mukhopadhyay
authors.affiliation: Department of Metallurgical and Materials Engineering, National Institute of Technology, Warangal-506004, Telengana, India.
authors.forename: Ajoy Kumar
authors.initials: AK
authors.lastname: Pandey
authors.affiliation: Department of Mechanical Engineering, National Institute of Technology, Durgapur, West Bengal 713 209, India.
authors.forename: Kallol
authors.initials: K
authors.lastname: Khan
authors.affiliation: Advanced Mechanical and Materials Characterization Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India.
authors.forename: Manjima
authors.initials: M
authors.lastname: Bhattacharya
authors.affiliation: ISRO Satellite Centre, Bangalore 560017, India.
authors.forename: D Raghavendra
authors.initials: DR
authors.lastname: Kumar
authors.affiliation: ISRO Satellite Centre, Bangalore 560017, India.
authors.forename: N
authors.initials: N
authors.lastname: Sridhara
authors.affiliation: ISRO Satellite Centre, Bangalore 560017, India.
authors.forename: Anand Kumar
authors.initials: AK
authors.lastname: Sharma