Heliyon
·
2023
·
IF 4
Shengxuan Wang,Hao Cui,Sijia Jin,Xiaodong Pi,Haiyan He,Chunhui Shou,Deren Yang,Lei Wang
The textured surfaces to reduce light reflectivity by using acid-alkali chemical etching and SiN x films are generally necessary for commercial crystalline silicon solar cells. However, this etching process requires a large amount of environmentally harmful acid-alkali solution and has limited options for texture and size. To overcome these disadvantages, a new anti-reflection strategy is proposed in this study, which is using soft nanoimprint lithography to prepare the textured structures on the outside of the SiN x films. The polyurethane with a high refractive index of 1.64 is selected as the texture material, and different templates are selected to prepare it into different light trapping structures, including positive-inverted pyramids, inverted lace cones, and positive-inverted moth-eye nanostructures allowing for easy customization of the textured structures. The finite element simulation and experiments demonstrate that these light trapping structures have a wide spectrum anti-reflection performance in visible and near-infrared bands. With the back surface of the commercial passivated emitter rear contact (PERC) bi-facial solar cells as the imprint substrates, some light trapping structures can reduce the surface weighted average light reflectivity (R w ) at the band of 300–1200 nm from 18.31% to less than 10% and the optimal structures can reduce R w to 8.71%. This anti-reflection strategy can also be applied to thin-film solar cells and crystalline silicon solar cells of other structures, such as HIT, Topcon, Perovskite/c-Si tandem, and so forth, which shows great development potential.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Shengjie Xia,Guanhua Zhang,Zhiyan Gao,Yue Meng,Bo Xie,Hanfeng Lu,Zheming Ni
In this paper, the novel 3D hollow Z-scheme heterojunction photocatalysts based on Bi 2 O 3 and CoAl layered double hydroxides (Bi 2 O 3 @CoAl-LDHs) were prepared for efficient visible-light-driven photocatalytic ammonia synthesis . The synthesized nanohybrid exhibits excellent photocatalytic ammonia synthesis performance (48.7 μmol·L −1 ·h −1 ) and structural stability , which is primarily attributed to the fact that Z-scheme heterojunction significantly enhanced lifetime of photogenerated carriers (6.22 ns) and transfer efficiency of surface photogenerated electrons (72.5%). Strict control experiments and nitrogen isotope labeling results show that nitrogen and hydrogen in the produced ammonia come from nitrogen and water in the reactant respectively. Electron paramagnetic resonance (EPR) experiments and density functional theory (DFT) calculations further reveal that the built-in electric field due to the difference between Bi 2 O 3 and CoAl-LDHs is the key to constructing the Z-scheme heterojunction. In addition, results of partial density of states (PDOS) show that Co in Bi 2 O 3 @CoAl-LDHs composite is the active site for photocatalytic N 2 fixation.
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高影响因子
IEEE TRANSACTIONS ON ELECTRON DEVICES
·
2023
·Vol. 70
·期 11
·5751-5756
·
IF 3.1
Yibo Ma,Xiaodong Zhang,Haiyu Qiu,Jing Guo,Chuan Tian,Liqiang Zheng,Chong Shen
At present, great success has been achieved in the development of perovskite light-emitting devices (LEDs) with red, green, blue, and near-infrared emission. However, red perovskite LEDs, as a key optoelectronic device, are still challenging, principally because under high bias voltage, halide separation will inevitably occur in mixed halide perovskite, resulting in unwanted color changes of the device. In addition, the poor stability and inherent toxicity of traditional lead halide perovskite limit its practical application. Here, the manufacturing of stable red LEDs based on ternary manganese halide CsMnBr3 is reported, which solves the problems of color instability and lead toxicity faced by perovskite red LEDs. The quantum efficiency is effectively improved by Cd $^{{2}+}$ ion doping. Photoluminescence (PL) quantum yield (PLQY) reaches 73.1% and has long-term stability. It can be stored at room temperature in air for more than 300 days. In addition, the red electroluminescent LEDs prepared with Cd:CsMnBr3 nanocrystals (NCs) has the broadband emission of self-trapping excitons centered at 660 nm and a comparable and reasonable low carrier valid mass conducive to charge transmission. The maximum brightness of the prepared red LEDs is 46.2 cd/ $\text{m}^{{2}}$ , showing a long half-life of 90 min at 25 °C, which is due to the excellent heat resistance, moisture resistance and high temperature resistance of Cd:CsMnBr3, as well as oxidation under environmental conditions. The results show that the broadband and stable emission of Cd:CsMnBr3 is compatible with the practical application of LEDs.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Jun Xu,Shanqing Jiang,Jiahui Ma,Qiuya Zhang,Hui Peng,Li Jiao,Liping Wang
Protonated g-C 3 N 4 (CNH) was prepared with g-C 3 N 4 powder by HNO 3 hydrothermal method, and Ag 3 PO 4 /CNH composite was further synthesized by chemical precipitation. The prepared samples were characterized by X-ray diffraction, Fourier transform infrared spectra, UV–Vis diffuse reflectance spectrometer, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, photoluminescence spectra and electron spin resonance. The photocatalytic performance of Ag 3 PO 4 /CNH under visible light was evaluated by the microcystin-LR (MC-LR) degradation experiment. The results showed that Ag 3 PO 4 could be successfully loaded on the surface of CNH, and its light absorption intensity was significantly improved compared with CNH. When the mass ratio of Ag 3 PO 4 was 20% in Ag 3 PO 4 /CNH composite, the photodegradation efficiency of MC-LR was the highest under the condition of visible light irradiation for 2 h with the degradation rate of 79.8% which was 5.4 times higher than that of pure CNH and 9.8 times higher than that of pure g-C 3 N 4 . The photodegradation reaction of Ag 3 PO 4 /CNH for MC-LR was in line with quasi-first-order kinetic model. The scavenger tests proved that ·O 2 – and h + played the major role in the degradation process. A possible Z-scheme degradation mechanism of MC-LR over Ag 3 PO 4 /CNH hybrid was proposed.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 12
·3617-3622
·
IF 6.641
Mingcai Li,Xuejie Zhang,Haoran Zhang,Weibin Chen,Li Ma,Xiaojun Wang,Yingliang Liu,Bingfu Lei
At present, blue-red composite LED light sources used for plant lighting are mainly composed of blue light and red light; the blue light is provided by gallium nitride LED chips, but the full-width at half-maximum (FWHW) is only approximately 25 nm, while the blue light required by plants for photosynthesis is wider. Focusing on this problem, this work reported that a dual emitting phosphor-in-glass plate (Dual-PiGP) was prepared towards a high power and dual broadband emitter, in which BaMgAl10O17:Eu2+ (BAM) and CaAlSiN3:Eu2+ (CASN) provide blue and red emission, respectively. Dual-PiGP exhibited several merits, including a high quantum efficiency of 93.90%, a superior thermal stability (80.1%@150 °C of the peak intensity at 25 °C), and a dual broad spectrum with a full-width at half-maximum (FWHM) of 50 and 106 nm at 446 and 645 nm, respectively. Moreover, a proof-of-concept Dual-PiGP plant lamp for application in indoor plant factories was successfully fabricated with Dual-PiGP and a 385 nm emitting LED chip, yielding blue- (400–500 nm) and red-light (580–780 nm) emission that matches well with the absorption spectrum of chlorophyll. The Dual-PiGP plant lamps were applied indoors to cultivate Italian lettuce, and commercial plant lamps assembled by LED chips were chosen as reference. The cultivation results indicated that the biomass of Italian lettuce was 12.12% greater than those cultivated using commercial plant lamps. Further analysis also certificated that the content of soluble protein and total chlorophyll were also improved. The Dual-PiGP light converter strategy provides an option for next-generation plant growth LEDs.
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 11
·期 1
·127-133
·
IF 8.067
Yong Zhang,Hui Liu,Shuai Liu,Qian Gong,Yushen Liu,Dan Tian,Lixing Kang
The p-CuI/n-SrTiO3 heterojunction photodetector (PD) is constructed based on a SrTiO3 wafer, which is covered with a CuI film via the vacuum thermal evaporation method. Compared with the SrTiO3 (STO) device, the CuI/STO PD exhibits significantly enhanced photocurrent. Furthermore, the CuI/STO PD presents excellent self-powered characteristics, including high on/off ratio (7 × 103) and fast response speed (0.6/3.3 ms) under 400 nm light irradiation. In particular, the CuI/STO PD shows a great narrowband photoresponse (FWHM ∼ 27 nm) at zero bias because of the proper and compatible bandgap of CuI and STO. More importantly, the CuI/STO device demonstrates a transparency of 70% over the entire visible light region and blocks 99.9% UV light (200–385 nm). This work provides an effective strategy to realize power-free, filter-free and UV-free PDs for many special applications.
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高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 17
·4683-4690
·
IF 5.976
Bingyan Zhu,Wenyu Ji,Zongquan Duan,Yang Sheng,Ting Wang,Qilin Yuan,Han Zhang,Xiaosheng Tang,Hanzhuang Zhang
During the last three decades, there has been significant development of quantum dot light emitting diodes (QLEDs) due to their widespread applications. However, common QLEDs depend on cadmium, which is toxic and limits their all-inclusive applications. To address this challenge, herein, we report a highly efficient and low turn-on voltage Cd-free inverted QLEDs with eco-friendly Zn–Ag–In–S quantum dots as the emissive layers. The device performance is closely related to the properties of the hole transport layer (HTL), which are explored by employing different hole transport materials, namely, 4,4′,4′′-tris(carbazol-9-yl) triphenylamine (TCTA) and N,N′-bis(naphthalen-1-yl)-N,N′ bis(phenyl)-benzidine (NPB). Although the energy levels of the lowest unoccupied molecular orbitals (LUMO) of TCTA and NPB are similar, electron leakage from the QDs to NPB is observed, which deteriorates the device performance. An excellent QLED can be achieved if a thick TCTA layer is introduced next to the QDs. Additionally, the QLED with a stepwise HTL consisting of TCTA/NPB presents a slightly higher current efficiency than the TCTA-only device, revealing that the reduction in holes accumulated at the QDs/HTL interface is beneficial for enhancing the device efficiency. Compared to the previously reported Zn–Ag–In–S based QLEDs, our device exhibits a low turn-on voltage of 2.2 V and the highest luminance (over 2000 cd m−2) and efficiency (larger than 2.1 cd A−1).
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高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·12005
·
IF 5.578
Cui Yan-Li,Guo Xiao-Ning,Wang Ying-Yong,Guo Xiang-Yun
N-aryl imidazoles play an important role as structural and functional units in many natural products and biologically active compounds. Herein, we report a photocatalytic route for the C-N cross-coupling reactions over a Cu/graphene catalyst, which can effectively catalyze N-arylation of imidazole and phenylboronic acid and achieve a turnover frequency of 25.4 h −1 at 25 o C and the irradiation of visible light. The enhanced catalytic activity of the Cu/graphene under the light irradiation results from the localized surface plasmon resonance of copper nanoparticles. The Cu/graphene photocatalyst has a general applicability for photocatalytic C-N, C-O and C-S cross-coupling of arylboronic acids with imidazoles, phenols and thiophenols. This study provides a green photocatalytic route for the production of N-aryl imidazoles.
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高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Yue Liang,Shangwei Feng,Bufan Yu,Qing Du,Jiacheng Liu,Yutong Pan,Xuan Liu,Lei Wang,Jiangshan Chen,Dongge Ma
Metal halide perovskite light-emitting diodes (PeLEDs) show immense potential in next-generation display technologies due to their exceptional optoelectronic properties. However, their operational stability and luminescence brightness remain core bottlenecks restricting their commercialization. To address this issue, this study reports an interference crystallization strategy that regulates crystal facet growth to reshape facet competition. By incorporating L-theanine (LT) into the precursor solution of FAPbBr 3 , the functional groups in LT selectively adsorb onto the (100) crystal facets of the perovskite, thereby suppressing the rapid growth of these facets and significantly enhancing the ordering of the crystal arrangement and crystal quality. Subsequently, 2,4,6-Tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (POT2T) is further introduced to modify the perovskite interface, synergistically passivating interface defects and confining the carrier recombination zone, thereby effectively suppressing interfacial non-radiative recombination. Consequently, the fabricated green PeLEDs achieve an external quantum efficiency (EQE) of 23.06% and an ultrahigh luminance of 358 135 cd m −2 , delivering an outstanding T 50 operational lifetime of 14 923 h at an initial luminance of 100 cd m −2 . Furthermore, the optimized device with an active area of 6 mm 2 exhibits a response time of 1.01 µs. Thus, this strategy provides new insights for high-luminance, long-lifetime and fast-response PeLEDs, broadening their potential applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Ruiting Zhang,Yahong Jin,Chuanlong Wang,Haoyi Wu,Li Chen,Yihua Hu
The ultraviolet (UV) light detection has important applications in photochemistry, material aging , plant cultivation, and integrated circuit lithography. And photochromic materials have attracted more and more attention in technological applications due to their different physical and chemical properties before and after irradiation with a specific excitation light source. Therefore, it is a very interesting work to realize the detection of ultraviolet light intensity based on photochromic materials with good response to ultraviolet light. Here, we design a dual excitation detection mode based on the inorganic photochromic material SrHfO 3 : Ho 3+ , and propose a simple and high-precision UV intensity detection method. The doping of Ho 3+ ions optimizes the photochromic effect of the SrHfO 3 host material and also enables the material to integrate the up-conversion and the downshifting luminescence modes. Different luminescence quenching degrees appear in response to photochromic effect between up-conversion and the downshifting luminescence modes, thereby constructing a dual excitation mode for high-precision UV light intensity detection. In addition, flexible films and 3D micro-rod arrays using the as-obtained photochromic material were designed and fabricated a photochromism platform toward the implementation of optical information storage. This work not only provides a photochromic platform for optical data storage, but also opens a way for simplification of UV intensity detection with high accuracy.
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高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Shuanglong Ma,Sihui Zhan,Yuguo Xia,Pengfei Wang,Qianlei Hou,Qixing Zhou
The Ag/ZnO/g-C 3 N 4 composite photocatalyst, which was synthesized by thermal polymerization of a melamine precursor combined with solvothermal reaction, was used as a visible-light-driven biocide toward Escherichia coli ( E. coli ). The Ag/ZnO/g-C 3 N 4 composite displayed considerably increased visible-light-driven bactericidal activity compared to g-C 3 N 4 , Ag/g-C 3 N 4 , and ZnO/g-C 3 N 4 powders. The photocatalytic destruction of E. coli cells was verified by fluorescence-based cell live/dead analysis and SEM. The mechanism of increased bactericidal effect was studied by UV–vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, photocurrent response, and electrochemical impedance spectroscopy (EIS). The enhanced photocatalytic bactericidal effect was attributed to the matching conduction band levels of g-C 3 N 4 and ZnO and the surface plasmon resonance (SPR) effect of Ag nanoparticles, which resulted in enhanced adsorption of visible light, reduced recombination of free charges, and rapid separation and transportation of photogenerated electrons-holes. The disinfection mechanism was investigated using different chemical scavengers and electron spin-resonance spectroscopy (ESR), and indicating the important role of h + and H 2 O 2 . Furthermore, taking into account the bulk availability and better bactericidal effect of Ag/ZnO/g-C 3 N 4 , this work provides a new pathway to develop advanced materials for water disinfection.
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Long Gao,Tuo Cheng,Lijie Gou,Yilin Zhang,Yuping Liu,Long Yuan,Xiaoyu Zhang,Yinghui Wang,Fanxu Meng,Jiaqi Zhang
Blue light-emittin g diodes (LEDs) are important components for perovskite electroluminescence applications, which still suffer from insufficient luminescence efficiency and poor stability. In Cl/Br mixed perovskite NCs, surficial defects cause severe light failure and ion migration, the in-depth mechanism of which is also not clear. To gain insights into these issues, we employ the ligand post-addition approach for mixed Cl/Br NCs by using octylammonium hydrobromide (OctBr) ligands, which effectively decrease surficial light loss and block ion migration pathways. The passivated CsPbCl1.5Br1.5 NCs exhibit exceptional blue emission with 95% PLQY, and the electroluminescence spectra of LEDs are located at the initial positions at the initial states. The treated NC blue devices show a negligible color shift as the voltage increases, which proves that electric-field-driven ion migration is drastically suppressed. In addition, OctBr-treated CsPbCl1.5Br1.5 and CsPbClBr2 NC LEDs show high external quantum efficiencies of 2.42 and 3.05% for emission peaks at 456 and 480 nm, respectively. Our work identified the nature of NC surface defects and provided a surficial modification approach to develop high-performance and color-stable blue mixed-halide perovskite LEDs.
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高影响因子
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