Optimization of W/WAlSiN/SiON/SiO2 tandem absorber consisting of double layer anti-reflection coating with broadband absorption in the solar spectrum region

Niranjan, K.; Kondaiah, P.; Srinivas, G.; Barshilia, Harish C.

doi:10.1016/j.apsusc.2019.143651

Cited by 25 publications

(11 citation statements)

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“…The full range reflectance of the sample results from the constructive and destructive interferences at each boundary along with absorption. [ 38 ] Three sample configurations have been optimized by varying the thickness of various layers. Figure a shows the optimized thickness of layers 2 and 3 of the three samples.…”

Section: Resultsmentioning

confidence: 99%

Realizing an Optical Micro‐Cavity in a CuCo₂O₄‐W‐CuCo₂O₄ Thin Film Stack for Spectrally Selective Solar Absorbers

Silpa

Srinivas

Biswas

et al. 2023

Advanced Optical Materials

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Tapping the potential of solar thermal energy requires spectrally selective solar absorber coatings, which lead to high photothermal efficiency. Micro‐cavities are known to dramatically enhance or suppress light absorption and emission in a directional manner and are used in nanophotonics, photodetectors, lasing, etc. Here, a dielectric‐metal‐dielectric multilayer stack with an optical micro‐cavity of a 12 nm tungsten layer formed between two dielectric layers of transition metal oxide CuCo2O4 (CCO) is designed. The CCO‐W‐CCO thin film multilayers deposited on stainless steel substrate by DC‐radio frequency magnetron sputtering achieve a 90% solar absorptance for the entire solar spectrum and a thermal emittance of 19% for the infrared spectrum. Optimization of thicknesses of individual layers is achieved by numerical simulations done in COMSOL Multiphysics, thereby reproducing the optical properties of each layer. The simulation results satisfactorily reproduce the experimental reflectance and demonstrate maximum power dissipation in the metallic layer in visible as well as NIR regions. Nevertheless, CCO material characterizations reveal that the enhanced absorption over the entire solar spectrum could be attributed to the underlying spinel crystal structure and the nanostructure film morphology.

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Section: Resultsmentioning

confidence: 99%

Realizing an Optical Micro‐Cavity in a CuCo₂O₄‐W‐CuCo₂O₄ Thin Film Stack for Spectrally Selective Solar Absorbers

Silpa

Srinivas

Biswas

et al. 2023

Advanced Optical Materials

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“…It was fabricated at 200°C substrate temperature and was stable at 600°C for 100 h. The TiB 2 /Ti(B,N)/SiON/SiO 2 multilayer absorber developed in this work was fabricated on SS304 substrate at room temperature with double‐layer antireflection coatings. Since oxynitride coatings exhibit good optical properties and thermal stability, 39 double‐layer antireflection coatings using oxynitrides exhibit better thermal stability than single‐layer antireflection coating 40,41 . The incorporation of O and N in the refractory metals can enhance the thermal stability of the coatings by forming oxides and nitrides.…”

Section: Discussionmentioning

confidence: 99%

“…Since oxynitride coatings exhibit good optical properties and thermal stability, 39 double-layer antireflection coatings using oxynitrides exhibit better thermal stability than single-layer antireflection coating. 40,41 The incorporation of O and N in the refractory metals can enhance the thermal stability of the coatings by forming oxides and nitrides. These nitrides and oxides in the refractory metals prevent the rapid diffusion of atmospheric oxygen during heat treatment.…”

Section: Thermal Stability Analysismentioning

confidence: 99%

Angular absorptance and thermal degradation analysis of TiB₂/Ti(B,N)/SiON/SiO₂ multilayer solar absorber coating

et al. 2022

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Multilayer solar selective absorber coatings have been developed in the last few decades. The thermal stability in terms of microstructure gives an insightful understanding of the optical properties of such coatings. In this context, we extensively utilized transmission electron microscopy (TEM) analysis to establish the thermal stability of TiB 2 /Ti(B,N)/SiON/SiO 2 coating, under thermal cycling/continuous heating to 500 • C in vacuum for 250 h. In particular, this work reports the variation in the solar absorptance of TiB 2 /Ti(B,N)/SiON/SiO 2 coating with different angles of incidence of the solar radiation. Extensive analysis using the TEM technique reveals the presence of oxide interlayers that act as diffusion barrier layers to enhance the thermal stability of the coating.Computational simulation using SCOUT software validates the measured reflectance spectrum of the developed multilayer coating. The minor changes in absorptance and emissivity after heat treatment in vacuum at 500 • C, together with high solar absorptance over a broad angular variation, establish the potential application of TiB 2 /Ti(B,N)/SiON/SiO 2 as a selective coating in concentrated solar power systems.

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“…Multilayer SSC, based on transition metal nitrides/oxynitrides/oxides, have recently received much attention due to their tuneable optical properties such as reflection, absorption, refractive index, and their high-temperature thermal stability. Niranjan et al have recently reported a multilayer SSC of W/WAlSiN/SiON/SiO 2 with a solar absorptance of 0.955 and low thermal emittance of 0.10 [15,16]. The samples exhibited excellent thermal stability in air (500 °C for 100 h) and in vacuum (700 °C for 200 h) ascribed to the formation of fine nano-multilayers of W 2 N and AlSiN in the WAlSiN layer structure.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive microstructural and optical characterization of the thermal stability of aluminum-titanium oxynitride thin films after high temperature annealing in air

et al. 2021

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The thermal stability of two AlyTi1-y(OxN1-x) layers prepared by cathodic vacuum arc deposition with different oxygen content was studied after high temperature annealing of the samples in air. These layers were designed to be part of solar-selective coating (SSC) stacks. Compositional and microstructural characterization of the thin films was performed before and after the thermal treatment by elastic recoil detection (ERD), transmission electron microscopy, and Raman spectroscopy. AlyTi1-yN sample was stable after 2 h of annealing at 450 °C. Initial stages of the formation of a surface oxide layer after annealing at 650 °C were observed both by ERD and Raman analysis. Contrarily, no changes were found after 2 h annealing treatment either at 450 and 650 °C in the composition and microstructure of AlyTi1-y(OxN1-x) sample. In both samples, the formation of a surface anatase TiO2 film was reported after 2 h annealing at 800 °C. These compositional and microstructural changes were correlated with the optical properties determined by spectroscopic ellipsometry. A transition from metallic to dielectric behavior with increasing annealing temperature was observed. These results complete the durability studies on the designed SSC based on AlyTi1-y(OxN1-x) materials, confirming that these stacks withstand breakdown at 600 °C in air.

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Optimization of W/WAlSiN/SiON/SiO2 tandem absorber consisting of double layer anti-reflection coating with broadband absorption in the solar spectrum region

Cited by 25 publications

References 50 publications

Realizing an Optical Micro‐Cavity in a CuCo₂O₄‐W‐CuCo₂O₄ Thin Film Stack for Spectrally Selective Solar Absorbers

Realizing an Optical Micro‐Cavity in a CuCo₂O₄‐W‐CuCo₂O₄ Thin Film Stack for Spectrally Selective Solar Absorbers

Angular absorptance and thermal degradation analysis of TiB₂/Ti(B,N)/SiON/SiO₂ multilayer solar absorber coating

Comprehensive microstructural and optical characterization of the thermal stability of aluminum-titanium oxynitride thin films after high temperature annealing in air

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Optimization of W/WAlSiN/SiON/SiO2 tandem absorber consisting of double layer anti-reflection coating with broadband absorption in the solar spectrum region

Cited by 25 publications

References 50 publications

Realizing an Optical Micro‐Cavity in a CuCo2O4‐W‐CuCo2O4 Thin Film Stack for Spectrally Selective Solar Absorbers

Realizing an Optical Micro‐Cavity in a CuCo2O4‐W‐CuCo2O4 Thin Film Stack for Spectrally Selective Solar Absorbers

Angular absorptance and thermal degradation analysis of TiB2/Ti(B,N)/SiON/SiO2 multilayer solar absorber coating

Comprehensive microstructural and optical characterization of the thermal stability of aluminum-titanium oxynitride thin films after high temperature annealing in air

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Realizing an Optical Micro‐Cavity in a CuCo₂O₄‐W‐CuCo₂O₄ Thin Film Stack for Spectrally Selective Solar Absorbers

Realizing an Optical Micro‐Cavity in a CuCo₂O₄‐W‐CuCo₂O₄ Thin Film Stack for Spectrally Selective Solar Absorbers

Angular absorptance and thermal degradation analysis of TiB₂/Ti(B,N)/SiON/SiO₂ multilayer solar absorber coating