Transition-metal-nitride films for optical applications

Ribbing, Carl G.; Roos, Arne

doi:10.1117/12.290190

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…[3][4][5][6]8,9,20,[30][31][32][33][34] Spectrally selective behaviour of transition metal nitride lms have been previously studied. 10 Studies of magnetron sputtered TiAlN/ TiAlON lms synthesized onto a metal substrate exhibited high absorptance and low emittance were reported by Barshilia et al 5 The absorptance of the lms was substantially enhanced to 0.95 by adding a Si 3 N 4 anti-reective coating on the top of these lms. 5 A higher thermal stability and high solar selectivity of 13.57 was achieved by this tandem selective surface.…”

Section: Introductionmentioning

confidence: 83%

“…Various types of metal nitrides based selective solar surfaces such as TiN, ZrN, HfN, TiAlN, TiAlON, NbAlN, NbAlON, MoAlN, and WAlN have been investigated by numerous groups. [1][2][3][4][5][6][7][8][9][10][11] Over the past few years, transition metal nitride based thin lms have attracted signicant research interest as selective solar surfaces in solar thermal conversion devices. Generally, the energy conversion performance of a selective solar surface depends on the lm materials, lm design and fabrication technique used.…”

Section: Introductionmentioning

confidence: 99%

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Chemical bonding states and solar selective characteristics of unbalanced magnetron sputtered Ti_xM_1−x−yN_yfilms

et al. 2016

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steel substrates via closed field unbalanced magnetron sputtering technology. These were investigated using XRD, SEM, XPS, UV-Vis, FTIR and nanoindentation techniques. Analysis of the optical properties showed the solar absorptance, in the visible range, of the Ti x M 1ÀxÀy N y films improved significantly from 51% to 81% with AlSi-doping and an increase of solar absorptance of up to 66% was recorded from films doped with Al. Moreover, the Al doping can reduce the thermal emittance in the infrared range from 6.06% to 5.11%, whereas doping with AlSi reduces the emittance to ca. 3.58%. The highest solar selectivity of 22.63 was achieved with TiAlSiN films. Mechanical studies showed enhanced hardness by $32%; enhanced yield strength by $16% and enhanced plastic deformation by $110% of Al and AlSi doped TiN matrix. IntroductionA spectrally selective surface is, generally, used to improve the photothermal conversion performance and, as such, it possesses two characteristics: high absorptance, a in the visible region of solar spectrum (0.3 to 2.5 mm) and low emittance, 3, (i.e., high reection) in the infra-red (IR) region ($2.5 mm) at operating temperatures. An excellent selective surface maximises the absorption of incoming photons in the visible region and minimises photon emission through thermal radiation in the IR energy region. Such a surface can be designed by an absorber-reector assembly. In such an approach, the reector is coated with a highly absorbing layer over the visible solar spectrum, while the infrared region is made transparent. Various types of metal nitrides based selective solar surfaces such as TiN, ZrN, HfN, TiAlN, TiAlON, NbAlN, NbAlON, MoAlN, and WAlN have been investigated by numerous groups.1-11 Over the past few years, transition metal nitride based thin lms have attracted signicant research interest as selective solar surfaces in solar thermal conversion devices. Generally, the energy conversion performance of a selective solar surface depends on the lm materials, lm design and fabrication technique used. A multi-layer lm stack with mixture of metal nitride, metal oxide and metal oxynitride lms e.g., TiAlN/AlON, and TiAl/ TiAlN/TiAlON/TiAlO has been explored for the potential commercial development of selective solar surfaces.3,12 TiAlN/ TiAlON/Si 3 N 4 selective absorbers have been produced on various substrates such as copper, nickel, stainless steel, glass and nimonic alloys.13 However, these materials are yet to be commercialized for solar energy conversion applications. View Article OnlineView Journal | View Issue solar selective surface applications, transition metal oxides based thin lms also received signicant research interests. 15-19Various synthesis methods such as evaporation, electrodeposition, chemical conversion, chemical vapour deposition and magnetron sputtering have been employed in manufacturing selective solar surfaces. Owing to its advantages in large area deposition, dry, clean and environment friendly, magnetron sputtering technique is widely used for syn...

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Chemical bonding states and solar selective characteristics of unbalanced magnetron sputtered Ti_xM_1−x−yN_yfilms

et al. 2016

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“…The optical applications of metal nitrides based selective solar coatings have been extensively discussed in a previous review study [70]. In Ref.…”

Section: Real-life Applications Of Transition Metal Nitride/oxynitridmentioning

confidence: 99%

Solar selective performance of metal nitride/oxynitride based magnetron sputtered thin film coatings: a comprehensive review

Khalil

Taha

Rahman

et al. 2018

J. Opt.

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Since solar thermal collectors are considered to be the most direct way of converting the solar energy into the usable form, in the last few years growing attention has been paid to the development of transition metal nitride and metal oxynitride based thin film selective surfaces for solar-thermal collectors in order to harvest more solar energy. A solar-thermal energy system, generally, shows very high solar absorption of incident solar radiation from the solar-thermal collectors in the visible range (0.3 to 2.5 µm) and extremely low thermal losses through emission (or high reflection) in the infrared region (≥ 2.5 µm). The efficiency of a solar-thermal energy conversion system can be improved by the use of solar selective surfaces consisting of novel metallic nanoparticles surrounded in metal nitride/oxynitrides systems. In order to enhance the effectiveness of solar thermal devices, solar selective surfaces with high thermal stability are a prerequisite. Over the years, substantial efforts have been made in the field of solar selective surfaces to attain higher solar absorptance and lower thermal emittance at high temperature (above 400°C) applications. In this article, we review the present state-of-the-art transition metal nitride and/or oxynitrides based vacuum sputtered Page 1 of 36 AUTHOR SUBMITTED MANUSCRIPT-JOPT-104532.R1 nanostructured thin film coatings with respect to their optical and solar selective surface applications. We have also summarized the solar selectivity data from recent published literature investigations, including discussion on some potential applications for these materials.

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“…Transition metal nitrides have been used for over three decades as protective coatings for various applications including moulds, punches, cutting tools, machine parts for motors, diffusion barriers for integrated circuits, solar reflectors, and biomedical implants [1][2][3][4][5][6][7][8]. More recently, the addition of one or more elements was found to improve the properties of the more traditional binary nitride thin films.…”

Section: Introductionmentioning

confidence: 99%

Vacuum ultra-violet spectroscopic ellipsometry study of single- and multi-phase nitride protective films

Aouadi

Bohnhoff

Amriou

et al. 2006

J. Phys.: Condens. Matter

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This paper reports on a systematic investigation of the optical properties of Ta(1-x)Zr(x)N single-phase and ZrN-Ag multi-phase films fabricated by unbalanced magnetron sputtering using vacuum ultraviolet spectroscopic ellipsometry (VUV-SE). VUV-SE is a newly developed technique that was used to evaluate the strength and energy of the interband electronic excitations/transitions in these films. The energy of the interband transition was found to be altered by any changes in the elemental composition for single-phase materials. For example, it was found to increase with the increase in the covalent character of the bond as more Zr atoms are substituted for by Ta atoms in the ZrN rock-salt structure. In contrast, the peak positions did not vary in the multi-phase structures because the constituent phases were immiscible and retained their electronic structure. However, the strength and width of the interband transition were found to change to reflect changes in phase composition and microstructure. The optical and electronic properties of these materials were simulated using density functional theory (DFT) within the generalized gradient approximation. The calculated refractive indices and density of states were in good agreement with the VUV-SE data.

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Transition-metal-nitride films for optical applications

Cited by 14 publications

References 17 publications

Chemical bonding states and solar selective characteristics of unbalanced magnetron sputtered Ti_xM_1−x−yN_yfilms

Chemical bonding states and solar selective characteristics of unbalanced magnetron sputtered Ti_xM_1−x−yN_yfilms

Solar selective performance of metal nitride/oxynitride based magnetron sputtered thin film coatings: a comprehensive review

Vacuum ultra-violet spectroscopic ellipsometry study of single- and multi-phase nitride protective films

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Transition-metal-nitride films for optical applications

Cited by 14 publications

References 17 publications

Chemical bonding states and solar selective characteristics of unbalanced magnetron sputtered TixM1−x−yNyfilms

Chemical bonding states and solar selective characteristics of unbalanced magnetron sputtered TixM1−x−yNyfilms

Solar selective performance of metal nitride/oxynitride based magnetron sputtered thin film coatings: a comprehensive review

Vacuum ultra-violet spectroscopic ellipsometry study of single- and multi-phase nitride protective films

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Chemical bonding states and solar selective characteristics of unbalanced magnetron sputtered Ti_xM_1−x−yN_yfilms

Chemical bonding states and solar selective characteristics of unbalanced magnetron sputtered Ti_xM_1−x−yN_yfilms