OPTICAL MATERIALS
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2020
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IF 2.779
Lu Chen,Fang Lei,Haohong Chen,Luqiao Yin,Ding Zhou,Ying Shi,Teng Ma
A novel Eu 3+ doped SiO 2 -B 2 O 3 -Al 2 O 3 -CaO-Na 2 O based borosilicate glass was designed to embed YAG: Ce for PiGs. It exhibits intense Eu 3+ red emission with the average decay times of 6.8 μs and has the thermal conductivity of about 0.9 W/(mK) (five times that of silicone resin). The doped Eu 3+ is over 10 mol% without any concentration quenching. The PiGs show variable decay time of Ce 3+ , which results from the tunable interface defects explained by the pseudo-solid solubility mechanism. The color of the WLEDs changes from cool white (6004 K) to warm white (3799 K) with more yellow emission added. The obtained maximal luminous efficiency and color rendering index are about 68 lm/W and 78, respectively. The anti-thermal quenching power of the PiGs is three times that of PiS based on the luminescent reduction. The PiG system can be used potentially for resin-free high power WLEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Xiaochun Zheng,Yidi Wang,Shoutian Ren,Qixiao Gai,Wenjun Liu,Quanli Dong
Interface defects are one of the main factors for inefficient photoelectric conversion of nanocomposites, which is also suitable for the photocatalytic nanosystem containing photosensitizers and co-catalysts, so the efficient passivation of interface defects can enhance their photocatalytic performance. In this work, P-doped C3N4 (P–C3N4) was prepared by the thermal polymerization of urea with phytic acid as the P doping source. Then, the doped P atoms could act as anchoring sites for photodeposited Ni nanoparticles (NPs) on P–C3N4, and Ni–P–N bonds were spontaneously formed between Ni NPs and P–C3N4 with doped P as the bridging ligand. The optimal H2 evolution rate of P–C3N4/Ni-20 is 1.56 mmol g–1 h–1, which is 52.0 and 6.0 times that of C3N4 and C3N4/Ni-30, respectively, and even 2.0 times that of P–C3N4/Pt-2%. Its apparent quantum efficiency of 4.35% at 420 nm was 6.9 times that of reference C3N4/Ni-30 without P doping. The optimized interface transfer of carriers by the formed Ni–P–N bonds between P–C3N4 and Ni NPs was the main factor for the enhanced photocatalytic performance of C3N4.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ENGINEERING FAILURE ANALYSIS
·
2021
·
IF 3.114
Bin Gou,Congzhen Xie,Huasong Xu,Yan Du,Rui Wang,Licheng Li,Weinan Fan
High temperature vulcanized (HTV) silicone rubber (SIR), as the sheath of composite insulators, is widely used as the insulation device in transmission lines due to their excellent hydrophobicity and pollution flashover resistance. However, the interfacial defects of insulators and severe operating environment will accelerate the aging of HTV SIR sheath, seriously affecting the operation reliability of electrical equipment. Herein, the samples designed with different sizes of interfacial defects are aged under water, sulfuric acid and nitric acid at 80 °C, respectively. The results show that a large number of cracks appear on the surface of HTV SIR samples with interfacial defects after nitric acid treatment at 80 °C for more than 2 days, while samples with no interfacial defects aged under same condition for 8 days maintain unchanged. According to the results of the micro morphology of the sample, the crack is caused by the interfacial stress of the sample. In addition, after nitric acid treatment, the thermal stability, tensile and dielectric properties of HTV SIR with interfacial defects decreased significantly. The initial decomposition temperature decreases by about 30 °C, while the residual weight increases by about 2.5%. Meanwhile, the tensile strength and fracture strain decrease from 4.58 MPa and 470% to 2.07 MPa and 130% respectively, proving that cracks caused by interfacial defects can critically avianize the mechanical properties and thermal stability of HTV SIR. Also, there is an extra dielectric loss peak appearing in the frequency range of 10 2 –10 4 Hz, which attributed to water invading and the MWS polarization at cracks. By aging HTV SIR with artificial interfacial defects under thermal and acid stress, the HTV SIR cracking phenomenon of composite insulators under severe operating environment is successfully simulated. This work can provide theoretical support ulteriorly for studying the cracking mechanism and the corresponding aging characteristics of HTV SIR used in composite insulators.
研究领域:
材料科学
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电气工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITE INTERFACES
·
2021
·
IF 2.952
Xiao Yu Zhang,Min Xu,Wen Yao Yang,Sheng Zhu Cao,Yan Ju Yang,Jie Li,Xi Yuan Hao
The interlayer defects of diamond/copper (Cr) composite have been eliminated by adding holmium (III) oxide through Spark Plasma Sintering (SPS) method. The effects of Ho2O3 addition of diamond–copper interlayer on the microstructure and phase composition are investigated. The total density of states (DOS) and partial density of states (PDOS) are investigated by the first-principles calculations. It is revealed that the addition of Ho2O3 has a distinct modification effect on diamond–copper (Cr) interlayer. Obvious cracks around the diamond outer surface are hardly found, and the diamond particles are enfolded by the copper matrix. The Cr2C phase that beneficial to reduce interlayer defects and improve interlayer bonding was generated under the effect of adding Ho2O3. The thermal conductivity of diamond/copper (Cr-Ho2O3) is 686 W/(m·K). The possible reasons for doping Ho2O3 to eliminate interlayer defects and improve the thermal conductivity were discussed.
研究领域:
材料科学
·
计算材料学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Chunying Ma,Chu Zhang,Shennan Chen,Yongchun Ye,Lei Sun,Liguo Gao,Yusran Sulaiman,Tingli Ma,Miaogen Chen
Perovskite solar cells (PSCs) have attracted a lot of attention from researchers as the most promising photovoltaic devices due to their outstanding power conversion efficiency (PCE) and low-cost. Although the PSC have reached a PCE over 25%, the interface between the perovskite and hole transport layer (HTL) still is a crucial factor limiting higher PCE and long-term stability. In this work, we choose an organic molecule Bis(trifluoromethyl)benzo amide (BTFZA) to passivate defects at the perovskite/HTL interface. Owing to a strong interaction with uncoordinated Pb 2+ , the BTFZA effectively passivated the surface defects , remarkably promoted carrier transportation. As a result, the perovskite device based on BTFZA surface modification showed a PCE increase of 16.4% over the control device. Especially, the fill factor (FF) and the open-circuit voltage (V OC ) of the modified device increased significantly. In addition, the unencapsulated BTFZA-modified device maintains better PCE compared to the control device after aging for over 600 h in ambient air with extreme humidity and temperature conditions. Results suggested that the introduction of BTFZA is an effective way to regulate the surface of perovskite film aiming at highly efficient and stable perovskite solar cells.
研究领域:
材料科学
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光伏技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wenyu Qiu,Yukun Wu,Yichen Wang,Zhiting Yang,Rui Yang,Chenxi Zhang,Yang Hao,Yuying Hao
Hybrid halide perovskite solar cells (PSCs) have enormous potential to provide energy for future space exploration and aerospace due to their unique advantages in harsh environments. Unfortunately, it is challenging to fabricate robust PSCs that are insensitive to low temperatures. This study presented the performance evolution of methylammonium triiodide (MAPbI 3 ) PSCs across a temperature range of 290 to 90 K and highlighted the decisive impact of interfacial defects on the devices’ low-temperature performance. The introduction of polymethyl methacrylate (PMMA) as interface modification layer, efficiently passivated the interface defects, released the interfacial stress, and thus decreased the phase transition temperature. As a result, the PMMA-modified device achieved a maximum efficiency of 22.4% at 90 K which was one of the highest efficiencies reported for MA-based PSCs at low temperatures. Remarkably, the PMMA-modified device retained nearly 100% of initial efficiency after 26 temperature cycling tests between 290 and 90 K, whereas the control device maintained only 62% of initial efficiency. This work demonstrated that interface engineering is a promising strategy for improving the low-temperature performance of PSCs.
研究领域:
材料科学
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能源研究
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Xiaohui Lu,Xiandong Zhao,Congcong Wu,Shiming Wang,Yanyan Li,Xiaojie Yang,Yang Li,Li Zhao
Interfacial defects between the perovskite layer and the adjacent charge transport layer play a crucial role in enhancing the power conversion efficiency (PCE) and stability of organic–inorganic halide perovskite solar cells. In this study, we employed a transition metal-containing selenide (NiSe) to modify the interface between the electron transport layer and the perovskite layer. Ni2+ as a transition metal exhibits a strong propensity for forming octahedral complexes with halide ions, thereby providing a favorable substrate for perovskite crystallization. This significantly contributes to the reduction of defect densities and the fabrication of high-quality perovskite thin films. Our findings indicate that the grain size of the perovskite films markedly increased upon modification with 0.4 mg mL−1 NiSe, resulting in a reduction of defect density from 2.175 × 1016 cm−3 to 1.485 × 1016 cm−3. Furthermore, the PCE of the NiSe-modified device, at a concentration of 0.4 mg mL−1, reached 14.85%, a significant improvement compared to that of the unmodified device (12.14%). These results offer a novel approach to fabricate perovskite films with enhanced crystallinity and reduced trap density.
研究领域:
材料科学
·
太阳能电池技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Xiangyang Zhao,Lingling Wang,Yawei Wang,Xingyu Zhang,Rong Fang,Yue Zhou,Rui Guo,Xintong Zhang,Yichun Liu
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cells are considered a promising new type of film cell, due to their rich elemental reservation and excellent photovoltaic performance. However, the deleterious defects at the heterojunction interface severely hinder charge transport, separation, and extraction, significantly limiting the photovoltaic performance of CZTSSe solar cells. In this study, a simple method involving the incorporation of Cd 2+ and Ag + dual-ion at the heterojunction interface was proposed to reduce interfacial defects. The results showed that Cd 2+ and Ag + dual-ion interface deposition effectively reduced the [2Cu zn + Sn zn ] harmful defects near the heterojunction interface and subsequently reduced the number of recombination centers in the interface. This led to improved carrier recombination at the interface. Meanwhile, the devices achieved a wider depletion width, which was more favorable for carrier collection. Ultimately, the conversion efficiency increased by 32.81 %. This simple interface dual-ion deposition strategy offers a promising strategy for further enhancing the efficiency of CZTSSe cells.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Yangfan Zhang,Yao Li,Han Yu,Kai Yu,Hongbing Yu
Defect sites on oxide semiconductors play a crucial role in promoting photocatalytiperformance and modulating the bandgap structure of photocatalysts. However, the role of interfacial coordinatively unsaturated defect sites between metal and oxide in photocatalysis is still under debate. So, we designed an experiment to probe the role of interfacial coordinatively unsaturated defect sites. In this work, a series of Ti/TiO2 photocatalysts with varying concentrations of interfacial Ti3+ sites were prepared through an epitaxial growth method under hydrothermal conditions. Through experimental and computational investigations, the roles of interfacial defect sites were discussed in detail. On the one hand, the interfacial coordinatively unsaturated Ti3+ sites could act as visible-light-responsive sites in photocatalytic reactions due to the overlap and hybridization of multiple electronic orbitals. On the other hand, the Ti/TiO2 interface exhibited a certain degree of metallic character near the Fermi level because of the partial delocalization and redistribution of electrons, facilitating the charge migration and separation across the metal-oxide interface. Consequently, the obtained Ti/TiO2 catalysts showed notably enhanced charge transfer efficiency and visible light photocatalytic activity compared to their pristine counterparts. This work may provide a new perspective to interfacial defect engineering in classic metal/oxide heterojunction photocatalysts and figure a more precise direction to synthesize higher effective photocatalysts for environmental governance.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Chenliang Wang,Hong Yang,Xuefeng Xia,Xiaofeng Wang,Fan Li
Recently, NiO x -based inverted planar perovskite solar cells (PSCs) have achieved great progress. However, the lattice mismatch between NiO x hole-transport layers (HTLs) and perovskite active layers will result in interfacial defect formation, which severely influences device efficiency and stability. In this work, this is alleviated by coating of polyethylenimine cations (PEI•HI) on the surface of NiO x HTLs. The introduction of PEI•HI can not only effectively passivate the surface defects of NiO x films, but also induce the in-situ-generation of polyethylenimine (PEI)-based two-dimensional (2D) perovskite interlayers between NiO x and CH 3 NH 3 PbI 3 (MAPbI 3 ). Such PEI-based 2D perovskite interlayer can dramatically mitigate the lattice mismatch between NiO x and perovskites to suppress the interfacial defects formations and promote the high-quality crystal nucleation and growth of above perovskite films. Meanwhile, it is demonstrated that the molecular weights of PEI act the pivotal part in controlling the nucleation quality of perovskites. When employing PEI with molecular weight of 10,000 (PEI-1000), the high-crystalline perovskite film with large-sized grains and reduced interfacial defects is obtained and the champion PSC delivers a power conversion efficiency (PCE) of 19.23% with weak hysteresis effect and improved reproducibility and stability. Our work provides a promising approach to improve the lattice match between NiO x and perovskites for high-performance NiO x -based inverted planar PSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Wenying Jiang,Chuanjin Tian,Zhiyang Ju,Yumin Liu,Shaojian Fu,Wenyan Zhao,Zhipeng Xie
The non-radiative recombination loss at the interface is a huge obstacle to improving the photovoltaic performance of perovskite solar cells (PSCs), especially carbon-based PSCs (C-PSCs). Here, we propose a strategy for synergistic regulation of interface defects and carrier transport through functional groups of long-chain ammonium salt molecules to form 2D perovskite passivation layers by surface treatment with 5-aminovalerate hydroiodide (5-AVAI). The results indicate that the carboxyl group (–COOH) in 5-AVAI molecules can form coordination bonds with uncoordinated Pb 2+ ions, thereby anchoring to the surface of the perovskite film. Simultaneously, the electrostatic interaction between the amino group (–NH 3 + ) and I − ions in 5-AVAI inhibits the formation of iodide vacancies, enhances defect passivation, and improves the transport and transfer efficiency of interfacial carriers. The atmospherically generated 5-AVAI-modified C-PSCs exhibited an efficiency of 16.50% and retained 85% of their initial efficiency for 80 days in atmospheric environment.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yuxiu Sun,Yunshuo Gao,Chenxu Geng,Zhengqing Zhang,Zhihua Qiao,Chongli Zhong
Metal-organic frameworks (MOFs), as a typical type of porous materials, are widely used as fillers in mixed matrix membranes (MMMs) to enhance the gas separation performance. However, non-selective interface defects are prone to appear in MMMs under high MOF loading conditions, meanwhile, the discontinuous dispersion of MOF particles in polymeric matrices makes the gas molecules diffuse along the MOF-polymer-MOF intersection path and difficult to achieve efficient molecular transfer. These factors greatly compromise the ability of MOF to enhance membrane separation performance. Herein, the [C 5 min][BF 4 ] encapsulated ZIF-67 (IL@ZIF) composites were embedded into the defect-free IL/Pebax ion gel matrix to form a mixed matrix ion gel membrane without interface defects. On the basis of good interfacial compatibility, the relatively continuous and highly selective CO 2 transmission channels were constructed via increasing the filler loading up to 80 wt%. In this context, the typical IL@ZIF/IL/Pebax membrane with 80 wt% IL content and 70 wt% IL@ZIF doping amount exhibits a CO 2 permeability of 408.2 Barrer and CO 2 /N 2 selectivity of 97.2, surpassing the latest upper line. This work may have high reference value in the construction and preparation of MOF-based MMMs with high performance in gas separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）