The spectral selectivity of metal-ceramic solar selective absorbing coatings is jointly determined by both nanoparticles and microstructure. However, achieving performance optimization through microstructural control remains a challenging task. A multilayer metal-ceramic coating with a tilted columnar structure, Cr/AlCrNbSiTiVN /AlCrNbSiTiVNO/SiO2, was fabricated by employing glancing angle deposition for the dual-absorber layers by tuning the deposition angle. Scanning electron microscopy (SEM)-based microstructural analysis unveiled a pronounced tilted columnar morphology within the dual-absorber layers. Subsequently, phase analysis conducted via XRD and XPS corroborated that these layers are high-entropy ceramic phases featuring a face-centered cubic (FCC) structure. A significant finding was that, despite a fixed composition, the spectral selectivity improved as the columnar tilt increased, highlighting the crucial role of the tilt angle in photothermal conversion performance. With the dual-absorber layers deposited at 80°, the coating exhibited the maximum columnar tilt and optimal performance, achieving an absorptance of 0.91 and an emittance of 0.25, which is attributed to the synergistic coexistence of multiple absorption mechanisms, including intrinsic absorption, surface plasmon resonance, optical trapping, and interlayer interference. In addition, the development of inclined columns is attributed to the shadowing effect, which confines atomic deposition to the tops of growing nuclei by inhibiting condensation in their immediate shadowed regions. The research provides innovative design perspectives for optimizing the spectrally selective absorption properties of multilayer metal-ceramic coatings, thus paving new ways for enhancing photothermal conversion.
TissaouiKZaghdoudiT. Against a background of energy uncertainty and climate change, is there a substitution effect between fossil fuels in OECD countries?Energy2025; 320: 135271.
2.
SainiRSainiDVermaP, et al.Climate change and energy transition-a critical review. Int J Green Energy2025; 23: 1–26.
3.
KamarulzamanAHasanuzzamanMRahimNA. Global advancement of solar drying technologies and its future prospects: a review. Sol Energy2021; 221: 559–582.
4.
ZhuJZhangCChenF, et al.Enhancing thermal energy collection performance for non-imaging concentrating Solar System with evacuated tube absorber by heat storage rods. Appl Therm Eng2025; 268: 125908.
5.
LiJLvXShaoJ, et al.Spectral splitting thermophotovoltaic systems using GaSb and InGaAs cells. Sol Energy Mater Sol Cells2025; 285: 113520.
6.
WuJCChenFZJouHL, et al.Common-ground solar power generation system. Int J Electron2026; 113: 1–21.
7.
HuaFLiuWLiF, et al.Life cycle assessment and energy-exergy-economic performance of solar photovoltaic/thermal desalination system integrated with copper coils condensation. Renew Energy2026; 256: 124624.
8.
YuQSuSDengW, et al.Coupling photochemical effects and photothermal conversion to boost hydrogen production from methanol steam reforming: fundamentals, advances, and prospects. Nano Energy2025; 142: 111238.
9.
XiangXSangSLuA, et al.Development of novel MgO-Fe2O3 solar energy capture-storage composites and solar absorption enhancement mechanism. Sol Energy2026; 303: 114103.
10.
QiuXLHeCYXiongQ, et al.Analysis of solar absorption, degradation mechanism and thermal stability in air environments for SS/TiB2/Al2O3 spectrally selective absorber coating. Opt Mater2024; 157: 116198.
11.
NuruZYMotaungDEKaviyarasuK, et al.Optimization and preparation of pt-Al2O3 double cermet as selective solar absorber coatings. J Alloys Compd2016; 664: 161–168.
12.
GongHShaoWMaX, et al.Absorption properties of a multilayer composite nanoparticle for solar thermal utilization. OPT LASER TECHNOL2022; 150: 107914.
13.
BarshiliaHCKumarPRajamKS, et al.Structure and optical properties of ag-Al2O3 nanocermet solar selective coatings prepared using unbalanced magnetron sputtering. Sol Energy Mater Sol Cells2011; 95: 1707–1715.
14.
FangWMaYWangX, et al.Microstructure instability and spectral selectivity degeneration of the WTi-Al2O3 multilayer solar selective absorbing coating. Surf Eng2025; 41: 601–612.
15.
LuJChenBHJinLH, et al.Thermal stability investigation of the SS/MO/Al2O3 spectrally selective solar absorber coatings. Surf Eng2018; 35: 565–572.
ZhangQ-C. Direct current magnetron sputtered W-AlN cermet solar absorber films. J Vac Sci Technol A1997; 15: 2842–2846.
18.
ZhangQCZhaoKZhangBC, et al.New cermet solar coatings for solar thermal electricity applications. Sol Energy1998; 64: 109–114.
19.
LiuHDFuTRDuanMH, et al.Structure and thermal stability of spectrally selective absorber based on AlCrON coating for solar-thermal conversion applications. Sol Energy Mater Sol Cells2016; 157: 108–116.
20.
BhattHNegiL. Power spectral density analysis to investigate morphology of Ni films. Surf Eng2024; 40: 226–235.
21.
GopalLSudarshanT. Ultra-black coatings is the new black. Surf Eng2023; 39: 636–640.
22.
Dey SPSKNagarD, et al.Epsilon-Near-Zero metal oxide-based spectrally selective reflectors. ACS Appl Opt Mater2024; 2: 1360–1366.
23.
BhartiRMursaleenMDeyA. Fabrication and optical-infrared performance of ag + TiN/ TiN/al₂O₃ multilayer coatings by multi-target magnetron sputtering. Can Metall Q2025; 64: 1–15.
24.
WangXGaoJHuH, et al.High-temperature tolerance in WTi-Al2O3 cermet-based solar selective absorbing coatings with low thermal emissivity. Nano Energy2017; 37: 232–241.
25.
ZhengLZhouFZhouZ, et al.Angular solar absorptance and thermal stability of mo–SiO2 double cermet solar selective absorber coating. Sol Energy2015; 115: 341–346.
26.
ZouCXieWShaoL. Functional multi-layer solar spectral selective absorbing coatings of AlCrSiN/AlCrSiON/AlCrO for high temperature applications. Sol Energy Mater Sol Cells2016; 153: 9–17.
27.
QiBShouHZhangJ, et al.A near-perfect metamaterial selective absorber for high-efficiency solar photothermal conversion. Int J Therm Sci2023; 194: 108580.
28.
WeiLJZhaoPXXuQ, et al.Multi-functional applications of TiN films with superior photothermal effect at adjustable wavelength achieved via oblique incident deposition technology. Chem Eng J2025; 505: 159011.
29.
SarkarSPradhanSK. Tailoring of optical and wetting properties of sputter deposited silica thin films by glancing angle deposition. Appl Surf Sci2014; 290: 509–513.
30.
CharlesCMartinNDevelM, et al.Correlation between structural and optical properties of WO3 thin films sputter deposited by glancing angle deposition. Thin Solid Films2013; 534: 275–281.
31.
HuangPKYehJW. Effects of substrate temperature and post-annealing on microstructure and properties of (AlCrNbSiTiV)N coatings. Thin Solid Films2009; 518: 180–184.
32.
FigueiredoNMCarvalhoNJMCavaleiroA. An XPS study of au alloyed al-O sputtered coatings. Appl Surf Sci2011; 257: 5793–5798.
33.
MoulderJFStickleWFSobolPE, et al.Handbook of x-ray photoelectron spectroscopy. United Stales of America: Perkin-Elmer Corporation1992; 220: 7–10.
34.
AnandanCBeraP. XPS Studies on the interaction of CeO2 with silicon in magnetron sputtered CeO2 thin films on si and Si3N4 substrates. Appl Surf Sci2013; 283: 297–303.
35.
RahimiENijdamTJahagirdarA, et al.A combined microstructural, electrochemical and nanomechanical study of the corrosion and passivation properties of a cr/CrN multilayer coating. Corros Sci2025; 252: 112943.
36.
MandrinoDPodgornikB. XPS Investigations of tribofilms formed on CrN coatings. Appl Surf Sci2017; 396: 554–559.
37.
KadariASchemmeTKadriD, et al.XPS And morphological properties of Cr2O3 thin films grown by thermal evaporation method. Results Phys2017; 7: 3124–3129.
38.
ZengXDaiXJiangM, et al.Coordinatively unsaturated Cr3+ species in CrOx/oCNT with enhanced catalytic activity in oxidative dehydrogenation of propane with CO2. Appl Surf Sci2025; 714: 164433.
39.
OhtsuNMasahashiNMizukoshiY. Angle resolved XPS studies on an anodic oxide formed on ti-nb-sn alloy and the photo-induced change in carbon contaminants adsorbed on its surface. Appl Surf Sci2012; 258: 6052–6055.
40.
LiuRWangXLuoL, et al.XPS study on the oxidation-induced segregation behavior of U-Nb alloy. J Electron Spectrosc Relat Phenom2025; 278: 147513.
41.
JingLWuJChangL, et al.Effects of DC pulse mode on the performance of nitride coatings: a case study of NbN coatings. Appl Surf Sci2025; 714: 164398.
42.
TénégalFde la Rocque AGDufourG, et al.Structural determination of sintered Si3N4/SiC nanocomposite using the XPS differential charge effect. J Electron Spectrosc Relat Phenom2000; 109: 241–248.
43.
WangLWangS. Quantitative analysis of self-healing properties and microstructure of ti-5Al-5Mo-5V-1Cr-1Fe alloy by quasi-in-situ XPS. J Alloys Compd2025; 1012: 178509.
44.
ZhengJWangYWuL, et al.Study on the tribological behaviour of ti@a-C:h/steel tribopairs: influence of friction-induced TiO2/Ti2O3 nanoparticles. Appl Surf Sci2025; 713: 164363.
45.
SilversmitGDeplaDPoelmanH, et al.An XPS study on the surface reduction of V2O5(001) induced by ar+ ion bombardment. Surf Sci2006; 600: 3512–3517.
46.
MinJYuanWChenY, et al.Preparation and thermal stability of AlMoON based solar selective absorption coating. J WUHAN UNIV TECHNOL2024; 39: 854–862.
47.
GulerUKildishevAVBoltassevaA, et al.Plasmonics on the slope of enlightenment: the role of transition metal nitrides. Faraday Discuss2015; 178: 71–86.
48.
DasogM. Transition metal nitrides are heating up the field of plasmonics. Chem Mater2022; 34: 4249–4258.
