The effects of microstructure on optical and thermal properties of porous silica films

Zhang, Xinwen; Zhao, Gaoling; Zhan, Lingtong; Zhan, Feng; Wang, Jianxun; Han, Gaorong

doi:10.1016/j.surfcoat.2017.01.062

Cited by 5 publications

(3 citation statements)

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“…[42] According to Fresnel's reflection principle, the relationship between reflectance (R) and the refractive index (n) of a homogeneous thin film coated on a substrate can be described by Formula (1). [43,44]…”

Section: Resultsmentioning

confidence: 99%

“…[ 42 ] According to Fresnel's reflection principle, the relationship between reflectance ( R ) and the refractive index (n) of a homogeneous thin film coated on a substrate can be described by Formula (). [ 43,44 ]

\text{R = [} \frac{\text{n0ns�?n2}}{\text{n0ns+n2}} \left(\text{]}\right)^{2}

where n 0 , n s, and n represent the refractive indices of air, substrate, and thin film coated on the substrate, respectively. Considering that the refractive indices at 632.8 nm of air and the quartz glass are 1 and 1.46, respectively, the optimal refractive index of the coating for reducing surface reflection should be close to 1.21.…”

Section: Resultsmentioning

confidence: 99%

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In Situ Generating YVO₄:Eu³⁺,Bi³⁺ Downshifting Phosphors in SiO₂ Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells

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Solar RRL

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Solar photovoltaic (PV) technology is an important way to solve global energy shortages and climate deterioration. [1][2][3][4] Crystalline silicon (c-Si) solar cells dominate the global solar PV market, occupying more than 95%, mainly owing to their superior photoelectric conversion efficiency (PCE), high stability, low cost, nontoxicity, and abundant materials. [5] A key goal of research and production of c-Si solar cells is to increase the PCE and reduce the manufacturing cost, thus reducing the levelized cost of electricity (LCOE). [6] In recent years, the PCE of c-Si solar cells has made tremendous progress due to the rapid development of passivating contact technology, [7][8][9] which is a typical technique for improving the electrical properties of c-Si solar cells. [10,11] However, further improvement of the PCE of c-Si solar cells depends on the cooperative improvement of the optical and electrical properties.Broadening the spectral response is one of the important ways to improve the optical properties of solar cells. To broaden the spectral response of c-Si solar cells, spectral conversion has been widely studied and developed as a promising technology. [12] Luminescence downconversion (including downshifting and quantum cutting) materials, which can absorb high-energy ultraviolet (UV) photons and emit low-energy photons at long wavelengths, can simultaneously improve the conversion efficiency of solar cells or modules [13,14] and enhance their UV stability, [15,16] thus attracting more attention. In addition to causing the aging of module packaging materials, [17] UV irradiation can degrade the electrical performance of solar cells. [18] Recently, Sinha et al. reported that more efficient n-type silicon-based solar cells, especially silicon heterojunction (SHJ) solar cells, are more vulnerable to UV

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Section: Resultsmentioning

confidence: 99%

“…[ 42 ] According to Fresnel's reflection principle, the relationship between reflectance ( R ) and the refractive index (n) of a homogeneous thin film coated on a substrate can be described by Formula (). [ 43,44 ]

\text{R = [} \frac{\text{n0ns�?n2}}{\text{n0ns+n2}} \left(\text{]}\right)^{2}

Section: Resultsmentioning

confidence: 99%

In Situ Generating YVO₄:Eu³⁺,Bi³⁺ Downshifting Phosphors in SiO₂ Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells

Zou

et al. 2023

Solar RRL

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“…The mirror confinement magnetic field was applied in order to enhance the plasma density. A negatively biased glassy carbon target is known to attract Ar + ions to sputter carbon species towards the substrate [25]. The substrate was a single-sided polished 4-inch N-type conductive silicon wafer (square resistance of ~10 Ω, 0.5 mm thickness).…”

Section: Experimental Methodsmentioning

confidence: 99%

Bias-Modulated High Photoelectric Response of Graphene-Nanocrystallite Embedded Carbon Film Coated on n-Silicon

et al. 2019

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We propose that bias-modulated graphene-nanocrystallites (GNs) grown vertically can enhance the photoelectric property of carbon film coated on n-Si substrate. In this work, GN-embedded carbon (GNEC) films were deposited by the electron cyclotron resonance (ECR) sputtering technique. Under a reverse diode bias which lifts the Dirac point of GNs to a higher value, the GNEC film/n-Si device achieved a high photocurrent responsivity of 0.35 A/W. The bias-modulated position of the Dirac point resulted in a tunable ON/OFF ratio and a variable spectral response peak. Moreover, due to the standing structured GNs keeping the transport channels, a response time of 2.2 μs was achieved. This work sheds light on the bias-control wavelength-sensitive photodetector applications.

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Grouting theories and technologies for the reinforcement of fractured rocks surrounding deep roadways

Kang

Wen-zhou

Gao

et al. 2022

Deep Underground Science and Engineering

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Grouting is an effective method to improve the integrity and stability of fractured rocks that surround deep roadways. After years of research and practice, various theories and a complete set of grouting technologies for deep roadways with fractured rocks have been developed and are widely applied in Chinese coal mining production. This paper systematically summarizes and analyzes the research results concerning the theory, design, materials, processes, and equipment for the grouting and reinforcement of fractured rocks surrounding deep roadways. Specifically, in terms of grouting methods, pregrouting, grouting‐while‐excavation, and postgrouting methods are explored; in terms of grouting theory, backfill grouting, compaction grouting, infiltration grouting, and fracture grouting theories are studied. In addition, this paper also studies grouting borehole arrangement, water‐cement ratio, grouting pressure, grouting volume, grout diffusion radius, and other grouting parameters and their determination methods. On this basis, this paper explores the physical and mechanical properties of organic and organic‐inorganic composite grouting materials, and assess grouting reinforcement quality testing methods and instruments. Taken as the field cases, the application of pregrouting in front of heading faces, grouting‐while‐excavation, and postgrouting in the Kouzidong coal mine are then introduced, and the effects of the grouting reinforcements are evaluated. This paper proposes a development direction for grouting technology based on problems existing in the grouting reinforcement of fractured rocks surrounding deep roadways.

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The effects of microstructure on optical and thermal properties of porous silica films

Cited by 5 publications

References 15 publications

In Situ Generating YVO₄:Eu³⁺,Bi³⁺ Downshifting Phosphors in SiO₂ Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells

In Situ Generating YVO₄:Eu³⁺,Bi³⁺ Downshifting Phosphors in SiO₂ Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells

Bias-Modulated High Photoelectric Response of Graphene-Nanocrystallite Embedded Carbon Film Coated on n-Silicon

Grouting theories and technologies for the reinforcement of fractured rocks surrounding deep roadways

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The effects of microstructure on optical and thermal properties of porous silica films

Cited by 5 publications

References 15 publications

In Situ Generating YVO4:Eu3+,Bi3+ Downshifting Phosphors in SiO2 Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells

In Situ Generating YVO4:Eu3+,Bi3+ Downshifting Phosphors in SiO2 Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells

Bias-Modulated High Photoelectric Response of Graphene-Nanocrystallite Embedded Carbon Film Coated on n-Silicon

Grouting theories and technologies for the reinforcement of fractured rocks surrounding deep roadways

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Product

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In Situ Generating YVO₄:Eu³⁺,Bi³⁺ Downshifting Phosphors in SiO₂ Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells

In Situ Generating YVO₄:Eu³⁺,Bi³⁺ Downshifting Phosphors in SiO₂ Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells