Abstract
CaF2 films of thicknesses in the range of 50–200 nm were deposited by thermal evaporation on glass substrates. A series of CaF2 films were also grown by oblique angle deposition in which the orientation of the substrate with the horizontal direction was varied from 0° to 75°. CaF2 films are crystalline and show X-ray reflections corresponding to (111), (220), and (311) crystal planes of the cubic phase. The surface morphology of the films was analyzed by atomic force microscopy and it is found that surface roughness increases with an increase in the deposition angle. The water contact angle studies on CaF2 films show that the wettability properties of the films depend on the film thickness and hydrophobicity enhances with the angled deposition. Optical studies found that CaF2 films have high transmittance (> 85%) and good anti-reflection properties in the wavelength range of 400–1000 nm. The study shows that the anti-reflection and hydrophobic properties of CaF2 films can be modified by the oblique angle thermal evaporation.
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References
Y.Y. Quan, L.Z. Zhang, Experimental investigation of the anti-dust effect of transparent hydrophobic coatings applied for solar cell covering glass. Solar Energy Mater. Solar Cells 160, 382–389 (2017)
X. Sun, L. Lia, X. Xua, G. Song, J. Tua, P. Yan, W. Zhang, K. Hu, Preparation of hydrophobic SiO2/PTFE sol and antireflective coatings for solar glass cover. Optik 212, 164704, 1–11 (2020)
M.A. Contreras, B. Egaas, K. Ramanathan, J. Hiltner, A. Swartzlander, F. Hasoon, R. Noufi, Progress toward 20% efficiency in Cu(In,Ga)Se2 polycrystalline thin-film solar cells. Prog. Photovolt. Res. Appl. 7, 311–316 (1999)
A. Alemu, A. Freundlich, N. Badi, C. Boney, A. Bensaoula, Low temperature deposited boron nitride thin films for a robust anti-reflection coating of solar cells. Solar Energy Mater. Solar Cells 94, 921–923 (2010)
A.S. Sarkına, N. Ekren, S. Sağlam, A review of anti-reflection and self-cleaning coatings on photovoltaic panels. Sol. Energy 199, 63–73 (2020)
K. Ding, X. Zhang, L. Ning, Z. Shao, P. Xiao, A.H. Baillie, X. Zhang, J. Jie, Hue tunable, high color saturation and high-efficiency graphene/silicon heterojunction solar cells with MgF2/ZnS double anti-reflection layer. Nano Energy 46, 257–265 (2018)
W. Li, F. Lv, T. Shu, X. Tan, L. Jiang, T. Xiao, P. Xiang, Improving the performance of FTO conducting glass by SiO2 and ZnO anti-reflection films for dye-sensitized solar cells. Mater. Lett. 243, 108–111 (2019)
N. Rezaeia, O. Isabella, Z. Vroon, M. Zeman, Optical optimization of a multi-layer wide band anti-reflection coating using porous MgF2 for sub-micron-thick CIGS solar cells. Sol. Energy 177, 59–67 (2019)
J.L. Doualan, P. Camy, R. Moncorge´, E. Daran, M. Couchaud, B. Ferrand, Latest developments of bulk crystals and thin films of rare-earthdoped CaF2 for laser applications. J. Fluor. Chem. 128, 459–464 (2007)
A.D. Bonis, A. Santagata, A. Galasso, M. Sansone, R. Teghil, Femto-second laser ablation of CaF2: Plasma characterization and thin films deposition. Appl. Surf. Sci. 302, 145–148 (2014)
H. Wang, R. Liu, K. Chen, X. Shi, Z. Xu, Electrodeposition and characterization of CaF2 and rare earth doped CaF2 films. Thin Solid Films 519, 6438–6442 (2011)
J. Mashaiekhy, Z. Shafieizadeh, H. Nahidi, I. Hadi, Effect of deposition method on the optical and microstructural properties of vacuum-deposited MgF2 thin films. Optik 124, 3957–3961 (2013)
I. Snetkov, A. Yakovlev, O. Palashov, Temperature dependence of optical anisotropy parameter of CaF2, BaF2 and SrF2 materials. Opt. Mater. 69, 291–294 (2017)
L. Yan, F. Dong, S. Zhao, H. Yan, H. Lv, X. Yuan, Hydrophobic MgF2 antireflective films with enhanced environmental durability by a sol–gel process. Mater. Lett. 129, 156–158 (2014)
R.P. Yadav, R.K. Pandey, A.K. Mittal, S. Dwivedi, A.C. Pandey, Multifractal analysis of sputtered CaF2 thin films. Surf. Interface Anal. 45, 1775–1780 (2013)
J. Sun, H. Wang, Y. Zhang, Y. Zheng, Z. Xu, R. Liu, Structure and luminescent properties of electrodeposited Eu3+-doped CaF2 thin films. Thin Solid Films 562, 478–484 (2014)
X. Liu, X. Hu, H. Miao, G. Zhang, J. Mu, T. Han, D. Zhang, CaF2:Ce3+/Yb3+ hollow spheres luminescence down-conversion property optimize anti-reflective coatings for solar cells. Sol. Energy 134, 45–51 (2016)
M.C. Liu, C.C. Lee, M. Kaneko, K. Nakahira, Y. Takano, Microstructure-related properties at 193 nm of MgF2 and GdF3 films deposited by a resistive-heating boat. Appl. Opt. 45(7), 1368–1374 (2006)
R. Thielscha, M. Pommiesa, J. Hebera, N. Kaisera, J. Ullmann, Structural and mechanical properties of evaporated pure and mixed MgF2-BaF2 thin films, Conference on Advances in Optical Interference Coatings, vol. 3738 (Germany, SPIE, 1999), pp. 539–548
F. Nakamura, T. Kato, G. Okada, N. Kawagichi, K. Fukuda, T. Yanagida, Scintillation and dosimeter properties of CaF2 transparent ceramic doped with Eu2+. Ceram. Int. 43(1), 604–609 (2017)
C.A. Lucas, D. Loretto, New insight into the structure and growth of CaF2/Si(111). Appl. Phys. Lett. 60, 2071–2073 (1992)
S. Sinharoy, Semiconductor and semiconductor/fluoride/semiconductor heteroepitaxial structure research: a review. Thin Solid Films 187, 231–243 (1990)
Y. Huang, M. Pu, Z. Zhao, X. Li, X. Ma, X. Luo, Broadband metamaterial as an ‘‘invisible’’ radiative cooling coat. Opt. Commun. 407, 204–207 (2018)
R.J. Reeves, C. Polley, J.S. Choi, Laser spectroscopy of CaF2:Eu:Sm thin films grown by pulsed laser deposition. J. Lumin. 129, 1673–1676 (2009)
A. Barranco, A. Borras, A.R. Gonzalez-Elipe, A. Palmero, Perspectives on oblique angle deposition of thin films: from fundamentals to devices. Prog. Mater. Sci. 76, 59–153 (2016)
M.M. Hawkeye, M.J. Brett, Glancing angle deposition: fabrication, properties, and applications of micro- and nanostructured thin films. J. Vac. Sci. Technol. A 25, 1317–1325 (2007)
R.K. Jain, Y.K. Gautam, V. Dave, A.K. Chawla, R. Chandra, A study on structural, optical and hydrophobic properties of oblique angle sputter deposited HfO2 films. Appl. Surf. Sci. 283, 332–338 (2013)
S. Mukherjee, D. Gall, Structure zone model for extreme shadowing conditions. Thin Solid Films 527, 158–163 (2013)
R.K. Jain, A. Khanna, Structural, optical and electrical properties of crystalline V2O5 films deposited by thermal evaporation and effects of temperature on UV–vis and Raman spectra. Optik 144, 271–280 (2017)
P. Yang, L. Li, S. Yu, H. Zheng, W. Peng, The annealing temperature and films thickness effect on the surface morphology, preferential orientation and dielectric property of NiO films. Appl. Surf. Sci. 493, 396–403 (2019)
W.A.A. Syed, N. Rafiq, A. Ali, R. Din, W.H. Shah, Multilayer AR coatings of TiO2/MgF2 for application in optoelectronic devices. Optik 136, 564–572 (2017)
R.K. Jain, J. Kaur, S. Arora, A. Kumar, A.K. Chawla, A. Khanna, Effects of oblique angle deposition on structural, electrical and wettability properties of Bi thin films grown by thermal evaporation. Appl. Surf. Sci. 463, 45–51 (2019)
I. Petrov, P.B. Barna, L. Hultman, J.E. Greene, Microstructural evolution during film growth. J. Vac. Sci. Technol. A 21(5), S117-S-128 (2003)
V. Torrisi, F. Ruffino, Nanoscale structure of submicron-thick sputter-deposited Pd films: effect of the adatoms diffusivity by the film-substrate interaction. Surf. Coat. Technol. 315, 123–129 (2017)
F. Ruffino, V. Torrisi, G. Marletta, M. G.Grimaldi, Atomic force microscopy investigation of the kinetic growth mechanisms of sputtered nanostructured Au film on mica: towards a nanoscale morphology control. Nanoscale Res. Lett. 6(112), 1–13 (2011)
R.A. Sigsbee, Adatom capture and growth rates of nuclei. J. Appl. Phys. 42, 3904–3915 (1971)
R.K. Jain, J. Kaur, A. Khanna, A.K. Chawla, Tailoring the structural, electrical, optical and wettability properties of ZnSe films by oblique angle thermal evaporation. Mater. Res. Express 6(11645), 1–13 (2019)
B. Bouaouina, C. Mastail, A. Besnard, R. Mareus, F. Nita, A. Michel, G. Abadias, Nanocolumnar TiN thin film growth by oblique angle sputter-deposition: experiments vs. simulations. Mater. Des. 160, 338–349 (2018)
R. Singh, R. Sivakumar, S.K. Srivastava, T. Som, Growth angle-dependent tunable work function and optoelectronic properties of MoOx thin films. Appl. Surf. Sci. 507, 144958 1–9 (2020)
C. Guo, M. Kong, D. Lin, C. Liu, B. Li, Microstructure-related properties of magnesium fluoride films at 193 nm by oblique-angle deposition. Opt. Express 21(1), 960–967 (2013)
H. Savaloni, N. Abbaszadeh, Influence of oblique angle deposition on the nano-structure and characteristics of ZnO thin films produced by annealing of Zn films. J. Electron. Mater. 45(7), 3343–3355 (2016)
R.N. Wenzel, Resistance of solid surfaces to wetting by water. Ind. Eng. Chem. 28(8), 988–994 (1936)
C. Su, A simple and cost-effective method for fabricating lotus-effect composite coatings. J. Coat. Technol. Res. 9(2), 135–141 (2012)
S. Chatterjee, M. Kumar, S. Gohil, T. Som, An oblique angle radio frequency sputtering method to fabricate nanoporous hydrophobic TiO2 film. Thin Solid Films 568, 81–86 (2014)
S. Hosseini, H. Savaloni, M.G. Shahraki, Design and engineering of sculptured nano-structures for application in hydrophobicity. J. Ind. Eng. Chem. 45, 391–403 (2017)
T. An, X. Deng, Y. Gao, S. Liu, C. Dou, J. Ju, Preparation of highly hydrophobic CeO2 films using glancing angle deposition. Mater. Lett. 216, 147–149 (2018)
P.W. Chi, C.W. Su, D.H. Wei, Control of hydrophobic surface and wetting states in ultra-flat ZnO films by GLAD method. Appl. Surf. Sci. 404, 380–387 (2017)
T. Murata, H. Ishizawa, A. Tanaka, Investigation of MgF2 optical thin films with ultra-low refractive indices prepared from autoclaved sols. Appl. Opt. 47(13), C246–C250 (2008)
D. Grosso, C. Boissierre, C. Sanchez, Ultralow-dielectric-constant optical thin films built from magnesium oxyfluoride vesicle-like hollow nanoparticles. Nat. Mater. 6, 572–575 (2007)
J. Noack, K. Scheurell, E. Kemnitz, P.G. Juan, H. Rau, M. Lacroix, J. Eicher, B. Lintner, T. Sontheimer, T. Hofmann, J. Hegmann, R. Jahneand, P. Lobmann, MgF2 antireflective coatings by sol–gel processing: film preparation and thermal densification. J. Mater. Chem. 22, 18535–18541 (2012)
A. Eshaghi, M. Mesbahi, A.A. Aghaei, Influence of physical plasma etching treatment on optical and hydrophilic MgF2 thin film. Optik 161, 1–7 (2018)
Acknowledgements
Atul Khanna thanks Council of Scientific and Industrial Research (CSIR), New Delhi, India for research grants. Ravish Kumar Jain thanks University Grant Commission (UGC), New Delhi, India. Jatinder Kaur thanks CSIR for research fellowship grants.
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Jain, R.K., Kaur, J., Khanna, A. et al. Growth and characterization of hydrophobic anti-reflection CaF2 films. J Mater Sci: Mater Electron 31, 14241–14248 (2020). https://doi.org/10.1007/s10854-020-03980-w
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DOI: https://doi.org/10.1007/s10854-020-03980-w