SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2021
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IF 7.267
Sheng Pang,Yang Yan,Zhi Wang,Dong Wang,Shijian Li,Wenhui Ma,Kuixian Wei
With the rapid increase of photovoltaic (PV) system production and installation, the recycling of end-of-life PV modules has become a grave issue. In this paper, a new method of microwave-enhanced EVA film swelling and separation for PV panels recycling was innovatively proposed. The results showed that the separation speed of different layers in microwave can be significantly accelerated. Different swelling agents were compared and trichloroethylene was proved to be the most effective. The analysis of dielectric loss and thermal expansion coefficient (TEC) of different layers indicated that the good absorbing property of antireflection layer and the difference of TEC accelerate the swelling separation. Different conditions such as temperature and liquid-solid ratio were also carried out to optimized separation. The mechanism of microwave enhanced EVA swelling has been analyzed by thermogravimetry and infrared analysis. This study has a good guiding significance for the green and efficient recycling of PV panels.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
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2021
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IF 1.797
Decao Ma,Lei Wang,Peiran Tong,Yanyan Zhang,Xin Jiang,Hengbin Mao,Tingting Xu,Bingbing Fan,Gang Shao,Wen Liu,Mingliang Li,Jinpeng Zhu,Hailong Wang,Hongliang Xu,Rui Zhang,Hongxia Lu
CsPbX 3 (X = Cl, Br, I) all-inorganic perovskite quantum dots have attracted extensive attention from researchers recently. However, the further development is confined by serious stability problems. In this work, the CsPbBr 3 QDs@SiO 2 /EVA films were prepared by supersaturated recrystallization, and SEM, EDS, XRD, FT-IR and PL were used to study microstructure, phase composition, and optical properties. Results show that during the preparation process, the amounts of precursor added would affect the fluorescence emission intensity of materials. The preparation method of films is simple, easy to operate, low cost, and beneficial to commercial large-scale production. In a typical synthesis, PbBr 2 and CsBr are dissolved in DMF, and then oleic acid (OA) and oleylamine (OAm) as ligands are added to stabilize the DMF−PbBr 2 −CsBr precursor solution. When the addition of TEOS is 0.06 mL, the PL peak strength of prepared films is higher and the thickness of CsPbBr 3 QDs@SiO 2 /EVA films is about 100 μm and flexible enough to be bent. At room temperature, the retention of fluorescence intensity of films is 67.4% after 30 d in the air, the retention is 63.6% after 40 h in the water, and the retention is 72.1% after 40 h under the UV light. EVA resins and SiO 2 coating can effectively isolate the contact between quantum dots and moisture and delay the intrusion of oxygen, which significantly improves the stability of pure quantum dots.
研究领域:
材料科学
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光学
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纳米技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yufeng Zhou,Jing Ding,Ze Wang,Yao Tong,Xiaojuan Liang,Juan Du,Wei Xia,Zhengzheng Liu,Weidong Xiang
In recent years, perovskite nanocrystals (NCs) have been considered novel and potentially valuable optical gain materials that can generate relatively low thresholds and stable stimulated emissions in various external environments. Here, for the first time, an ethylene vinyl acetate copolymer (EVA) film-protected metal halide perovskite (Cs 4 PbBr 6 ) solid powder was successfully synthesized, and its photoluminescence quantum yield (PLQY) value was as high as 61%. In addition, because the Cs 4 PbBr 6 @EVA composite film has excellent optical gain performance, this work explored the optical gain of the Cs 4 PbBr 6 @EVA composite film under 800 nm femtosecond (fs) laser excitation. The experimental results show that the Cs 4 PbBr 6 @EVA composite film has a low threshold (0.89 mJ/cm 2 ) and stable stimulated emission and generates amplified spontaneous emissions (ASEs) at 544 nm. In addition, the application of Cs 4 PbBr 6 @EVA composite film in the field of white light-emitting diodes (WLEDs) has also been studied. The color gamut of this Cs 4 PbBr 6 @EVA composite film is as high as 124.7% of the National Television Standards Committee (NTSC) 1953 standard color gamut and covers 92.8% of the Rec. 2020 standard color gamut. This work proposes a simple method to solve the problem of the poor stability of perovskite solid powder, and the prepared Cs 4 PbBr 6 @EVA composite film shows significant promise in WLED and laser applications.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 111
·110409-110415
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IF 3.289
Jin Dong,Baoping Lin
As an effective luminescent down-shifting (LDS) species, Eu3+ complexes have been doped in ethylene-vinyl acetate (EVA) films to improve the spectral response of silicon photovoltaic modules in the ultraviolet region. One key point about the improvement of photoelectric conversion efficiency by the LDS technique is increasing the fluorescence intensity of the EVA composite film as far as possible while staying within the visible light transmittance of the film. Around this point, we attempt to offer an idea for further studies. In this study, nano-SiO2 modified by a silane coupling agent was doped into EVA film with a fixed content of Eu3+ complex by the casting method. The experimental results show that when the modified SiO2 content is within 4%, the fluorescence of the EVA composite film gradually increases with increase in the modified SiO2 content and before formation of EVA composite film, the fluorescence intensities have no difference between the mixture with modified SiO2 and that without modified SiO2. SEM and AFM images of the EVA composite films show that the complex particles are probably enwrapped by aggregations of the modified SiO2 during the film-forming process, which strengthens the rigidity of the Eu3+ complex in the structure and results in the enhancement of fluorescence intensity. When the modified SiO2 content is within 2%, the visible light transmittance of the EVA film only slightly decreases. The photoelectric conversion efficiency of polycrystalline silicon solar cell coated with the composite film increases from 12.13% to 12.29%. Hence, the study provides a feasible approach to improve the LDS technique and has a potential application value.
研究领域:
材料科学
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光伏技术
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纳米技术
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2020
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IF 4.469
Yixuan Wang,Caixiang Chen,Xia Wu,Zhihui Wang,Shumei Wen,Jing Yu,Chenghu Yan,Wei Cong
Biofouling is a critical challenge for the commercial application of photobioreactors for microalgae cultivation. In this work, a series of amphiphilic sulfobetaine copolymers (ASC) with different ratios of sulfobetaine (SBMA) and 2, 2, 2-trifluoroethyl methacrylate (TFMA) were synthesized via a monomer-starved seeded semi-continous emulsion polymerization method and were used to improve the antibiofouling capability of ethylene-vinyl acetate copolymer (EVA) film by surface coating method. Effects of the SBMA/TFMA ratio on the resultant ASC latexes and coating properties were investigated. With the increase of the SBMA/TFMA ratio, the particle diameter, polydispersity index and water uptake of ASC latexes and coating decreased from 261.8 nm to 144.9 nm, 0.198 to 0.054 and 26.28 % to 7.84 %, respectively, and increased afterwards. Fourier transform Infrared (FT-IR) spectra and X-ray photoelectron spectroscopy analysis (XPS) indicated that SBMA and TFMA were introduced onto the EVA film surface successfully. The contact angle of ASC modified EVA (EVA-ASC) film sharply decreased after immersed in water. The EVA-ASC film either in dry, or in water swollen state exhibited excellent optical transparency in the visible light. The adsorption of bovine serum albumin and Chlorella sp. on the EVA-ASC surface was investigated with protein and microalgae adsorption assay. It was shown that the EVA-ASC film had excellent protein and microalgae absorption resisting characteristic, the density of absorbed protein and microalgae decreased 92 % and 50 % compared with those of EVA film, respectively.
研究领域:
生物技术
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材料科学
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环境工程
✓ 已验证
DOI
高影响因子
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