Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 34
·17943-17953
·
IF 8.867
Guiting Chen,Fan Zhang,Meiyue Liu,Jun Song,Jiarong Lian,Pengju Zeng,Hin-Lap Yip,Wei Yang,Bin Zhang,Yong Cao
A novel alcohol-soluble conjugated bispyridinium salt (FPyBr) is developed and used as a cathode modifier to improve the cathode interface of planar heterojunction perovskite solar cells (PHJ PVSCs). The excellent electron-withdrawing ability of bispyridinium rings endows FPyBr with a favorable energy level alignment with phenyl-C60-butyric acid methyl ester (PCBM) and the cathode (e.g., Al), which leads to an ideal ohmic contact and efficient electron transport and collection. The deep-lying highest occupied molecular orbital energy level of FPyBr can also effectively block hole carriers and thus decrease leakage current and hole–electron recombination at the cathode interface. In addition, FPyBr can n-dope PCBM through an anion-induced electron transfer process, which increases the electron mobility of PCBM drastically, thereby diminishing interfacial resistance and promoting electron transport. As a result, by incorporating an FPyBr cathode interlayer with ethanol solvent, high-performance and low-hysteresis PHJ PVSCs with a maximal power conversion efficiency (PCE) of 19.61% can be realized. In contrast, reference devices without any cathode interlayer display a distinctly worse performance, with a PCE of 16.97%. Therefore, this excellent cathode modifier provides a new opportunity to fabricate high performance multilayer PVSCs using low-temperature solution processing without interfacial erosion/mixing.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xianqiang Xiong,Chuanqun Zhang,Xiao Zhang,Liya Fan,Lujia Zhou,Yuxiao Chu,Weiya Huang,Chenglin Wu,JiangShan Li,Xiaogang Yang,Deman Han
Nanoporous BiVO 4 is a promising photoanode material for driving the photoelectrochemical (PEC) water splitting to hydrogen energy, whereas its performance is limited by the sluggish surface catalysis reaction. Herein, a facile citrate-assisted method was developed for growing uniform amorphous FeOOH overlayer on nanoporous BiVO 4 , which significantly improved the water oxidation kinetics and resulted in a remarkable photocurrent density of 3.33 mA cm −2 at 1.23 V (vs. RHE). The activity enhancement was even superior to the well-crystallized α-FeOOH and β-FeOOH modified BiVO 4 . The citrate serves as the bridging agent that not only optimizes the BiVO 4 /FeOOH interface facilitating the hole trapping/transport, but also inhibits the particle growth of FeOOH nanolayer and provides more oxygen vacancies to promote the water oxidation. We demonstrate that the uniform FeOOH overlayer acts as the hole storage layer and catalyst, which increases the potential drop in the Helmholtz layer and greatly facilitates the interfacial hole transfer. Moreover, the citrate-assisted modification method was proved to be a general strategy to improve the PEC performance of TiO 2 and α-Fe 2 O 3 photoanodes. Our work provides a simple and effective design strategy for constructing uniform semiconductor/electrocatalysts interface that can realize efficient solar-to-hydrogen conversion.
研究领域:
材料科学
·
能源转换与储存
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xinfei Zhang,Panpan Lin,Jincheng Lin,Xinyue Li,Shuye Zhang,Fugang Lu,Zihan Cong,Ce Wang,Peng He,Tiesong Lin
A novel transient liquid phase bonding (TLP) method for obtaining high-temperature resistant diamond/Cu joint was designed. The joint was achieved through the isothermal solidification of Au–Si interlayer assisted by the diamond active modified layer and NiTi particles. The interfacial reaction mechanisms in the TLP process were systematically investigated in this study. The results shown that Ti 5 Si 3 C, CuTiSi and NiTiSi precipitated from the seam. Due to the precipitation of Si and the interdiffusion of Au–Cu, a ductile Au–Cu solid solution ((Au, Cu)ss) matrix formed. The shear strength of the diamond/Cu joint was notably affected by the holding time. The maximum room-temperature shear strength of 108 MPa was achieved when the joints were held at 600 °C for 60 min, and the high-temperature strength was still up to 22 MPa at 600 °C. The high strength of the joints was achieved because of (i) the elimination of the Cu(Au)–Si brittle phases, (ii) the NiTiSi whiskers pulling-out mechanism, and (iii) the moderate distribution of compounds at the diamond/seam interface.
研究领域:
材料科学
·
焊接工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 9
·1761
·
IF 2.467
Liaojun Wan,Fuchao He,Yu Qin,Zhenhua Lin,Jie Su,Jingjing Chang,Yue Hao
This paper reports low temperature solution processed ZnO thin film transistors (TFTs), and the effects of interfacial passivation of a 4-chlorobenzoic acid (PCBA) layer on device performance. It was found that the ZnO TFTs with PCBA interfacial modification layers exhibited a higher electron mobility of 4.50 cm2V−1s−1compared to the pristine ZnO TFTs with a charge carrier mobility of 2.70 cm2V−1s−1. Moreover, the ZnO TFTs with interfacial modification layers could significantly improve device shelf-life stability and bias stress stability compared to the pristine ZnO TFTs. Most importantly, interfacial modification layers could also decrease the contact potential barrier between the source/drain electrodes and the ZnO films when using high work-function metals such as Ag and Au. These results indicate that high performance TFTs can be obtained with a low temperature solution process with interfacial modification layers, which strongly implies further potential for their applications.Keywords:ZnO thin film transistors;solution process;interfacial modification layers;stability;contact potential barrier
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 3
·1349-1355
·
IF 9.931
Junlei Tao,Nasir Ali,Kang Chen,Zhaoxiang Huai,Yansheng Sun,Guangsheng Fu,Weiguang Kong,Shaopeng Yang
Interface modifying layers (IMLs) play a pivotal role in the improved performance of perovskite solar cells (PSCs). Herein, we report a new IML based on Bphen:Cs2CO3:BCP (BCB), which is inserted at the interface of phenyl-C61-butyric acid methyl ester (PC61BM) and a Ag electrode. Consequently, the efficiency of PSCs is significantly improved by 5% (from 17.57% to 18.29%), mainly due to the increased open circuit voltage (VOC). It is revealed by ultraviolet photoelectron spectroscopy (UPS) that the work function of Ag is reduced from 4.68 eV to 3.90 eV, after being modified by BCB due to the formation of a strong negative interfacial dipole at the Ag/BCB interface. The decreased work function of Ag improves the ohmic contact between PC61BM and Ag, facilitating carrier extraction and suppressing the charge recombination at the interface of PC61BM and the Ag electrode. As a result, the reverse saturation current of the final PSC is decreased by approximately one order of magnitude, which is consistent with a larger VOC. Our work provides a comprehensive understanding of the interface between a metal electrode and an electron transporting layer (ETL), and hence paves a way towards better interfacial engineering and highly efficient solar cells.
研究领域:
材料科学
·
能源工程
·
光电技术
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2016
·
IF 4.732
Yaru Hou,Junyou Yang,Qinghui Jiang,Weixin Li,Zhiwei Zhou,Xin Li,Shuqin Zhou
By dipping the mesoporous TiO 2 film in Sr 2+ solutions and subsequent annealing, a modification layer of SrTiO 3 has been formed on the surface of the mesoporous TiO 2 film, and the effect of modification on the photovoltaic characteristics of the perovskite solar cells has been studied detailedly. The XPS and TEM results verified the existence and nature of the SrTiO 3 modification layer. Benifiting from the TiO 2 surface modification, the morphology of perovskite film and light absorption of the CH 3 NH 3 PbI 3 absorber have been improved effectively, and a faster charge transfer has also been achieved between the CH 3 NH 3 PbI 3 perovskite layer and the modified TiO 2 . As a result, an average conversion efficiency of 11.4% has been achieved in the perovskite solar cell based on the modified mesoporous TiO 2 by 10 mM Sr 2+ solution, and it increases approximately by 46% in comparison with the photovoltaic efficiency of 7.8% of the perovskite solar cell based the bare mesoporous TiO 2 layer.
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 Environmental Chemical Engineering
·
2022
·
IF 7.968
Caifeng Xia,Xiangming Li,Yuan Xie,Fanping Kong,Menglan Zhao,Yu Wang,Yang Wang,Qian Zhang,Zilin Meng
The discharge of tetracycline (TCs) antibiotics into the natural environment poses a serious threat to human beings. In the removal of antibiotics by adsorption method, both increase of adsorption capacity and enhancement of adsorption reliability should be considered. In this study, tyrosine intercalated layered double hydroxide (Tyr@LDH) was prepared by a one-step method and characterized by XRD , FT-IR, and SEM . Adsorption kinetics and isotherms studies revealed that compared with LDHs, the adsorption of TC by Tyr@LDH was a multi-layer adsorption process , with more adsorption sites and larger adsorption capacity. Thermodynamic experiments showed that increasing temperature was beneficial to TC adsorption, indicating adsorption was an endothermic process. In the results of the molecular dynamics study, TC molecules entered the interlayer of LDHs by hydrophobic interaction, and possessed strong interactions with Tyr molecules by electron donor and acceptor, hydrogen bonding, and electrostatic interaction. The antibacterial experiments showed that the inhibition zone of Tyr@LDH was smaller than that of LDHs, indicating that with the presence of Tyr, TC molecules were adsorbed reliably. pH, coexisting ions, and recycle experiments proved that 1-Tyr@LDH had reliable adsorption for TC and stability in complex environments. Overall, Tyr@LDH material was expected to be an adsorbent with good adsorption efficiency and reliable adsorption performance for the treatment of TC from the environment.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2016
·Vol. 108
·期 18
·
IF 3.142
Li Jiangsheng,Jiu Tonggang,Li Bairu,Kuang Chaoyang,Chen Qiushan,Ma Sushuang,Shu Jie,Fang Junfeng
A thin potassium stearate (KSt) film combined with an optimized ZnO film was introduced to improve the fill factor (FF) of highly efficient inverted polymer solar cells (PSCs). Atomic force microscopy and contact angle measurements were used to show that the introduction of KSt did not change the morphology of interlayer. On the contrary, it is beneficial for the spread of the active layer on the interlayer. The origin of enhanced FF was systematically studied by the ideal current-voltage model for a single heterojunction solar cell and electrochemical impedance spectroscopy. On the basis of the data analysis, the reduced charge recombination loss was responsible for this improved FF. At last, when KSt was replaced by sodium stearate (NaSt), the similar experiment phenomenon was observed. This indicates that inserting a metallic stearate modified layer is a promising strategy to enhance inverted PSCs performance.
研究领域:
材料科学
·
能源科学
·
光伏技术
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Songhan Wan,Tianxiang Li,Songbo Chen,Xing Huang,Shuwei Cai,Xianru He
A kind of multi-modified layered double hydroxide (LDH) was prepared as the filler to improve the thermal-oxidative aging resistance of Nitrile-butadiene rubber (NBR). Firstly, LDH was deposited in situ on the graphene oxide (GO) to get the intermediate filler by physical interaction, which is called LDH-GO (LG). Then 4-Aminodiphenylamine (RT) was grafted onto the LG to obtain LDH-GO-KH560-RT (LGR) compound filler with aging function by chemical modification. The result of Fourier transform infrared spectroscopy (FTIR) and 1 HNMR demonstrated that RT was grafted to the surface of LDH successfully. The morphology of LGR composite particles was observed by scanning electron microscopy (SEM). The graft ratio of RT was calculated by Thermogravimetric analysis (TGA). The mechanical properties of NBR/LGR composites were tested before and after aging. Compared with modified LDH prepared by intercalation method, the thermal-oxidative aging resistance of NBR was improved most obviously by adding LGR in the presence of carbon black. The aging resistance mechanism of NBR/LGR composite were studied by dynamic mechanical analysis (DMA), thermogravimetric-differential scanning calorimeter synchronization analysis (TGA-DSC), crosslinking density test and attenuated total reflectance Fourier transform infrared spectra (ATR-FTIR).
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2016
·
IF 11.553
Cong Chen,Hao Li,Junjie Jin,Yu Cheng,Dali Liu,Hongwei Song,Qilin Dai
Recently, much progress has been achieved in the lab prototype perovskite solar cells (PSCs), however, the challenging toward the commercial production of PSCs still remains, which is their low stability due to the inherent moisture sensitivity of the perovskite photoactive layer. In this work, a hydrophobic hole modification layer, zinc phthalocyanine (ZnPc), is introduced to the typical planer hetero-junction (PHJ) structure to improve the device performance and prevent moisture. The ZnPc based devices show an improved power conversion efficiency ( PCE ) of 16.8% compared to 15.1% for the unmodified devices, and highly enhanced long-term stability (91% of initial PCE remains after 2400 h), which is the best report for PSCs in ambient environment without sealing. In addition, pulsed laser deposition (PLD) technique is used to prepare electron collection layer Nb-doped TiOx in PSC fabrication process. Devices with large area (225 mm 2 ) and flexibility were also fabricated in this study to demonstrate the potential practical application of this strategy. This work paves a way for the developments of PSCs with long-term stability and demonstrates a strategy toward practical applications for PSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yanfu Wan,Chunyan Yang,Xingquan Zhu,Xinyu Zhang,Junfeng Tong,Jianfeng Li,Zhilong Qian,Xiang Ma,Heng Zhang
PEDOT:PSS is widely employed as a hole injection layer (HIL) in quantum dot light-emitting diodes (QLEDs). However, its hygroscopicity and acidity can lead to electrode corrosion and compromise device stability. Here, high-performance HIL-free QLEDs are demonstrated, enabled by carbazole-based self-assembled monolayers (SAMs) functioning as an interfacial modification layer (IML) on ITO. The SAMs boost ITO work function for direct hole injection and use shallow low unoccupied molecular orbital level (LUMO) to curb leakage. Consequently, the QLED incorporating 2-(9H-carbazol-9-yl)ethyl phosphonic acid (2PACz) IML achieves high external quantum efficiency (EQE) of 31.33%, an excellent brightness of 430 900 cd m − 2 and a long T 95 operational lifetime of 5971 h at 1000 cd m −2 , all of which significantly outperforming the PEDOT:PSS device. To the best of the knowledge, these performances are the highest ever reported for HIL-free QLEDs. Furthermore, the 2PACz-based QLEDs can also sustain high EQE (≈20%) at extremely low current densities of 0.015 mA cm −2 (3.6 cd m − 2 ), which is very beneficial for displays to achieve high efficiency at low brightness. This work paves the way for stabler, high-performance QLEDs and faster commercialization.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
器件物理
·
量子点
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yajing Du,Hao Lin Guo,Xin Su,Mingming Guo,Bowen Li,Hua Wang,Xiaoning Gao,Qing Yuan,Yue Teng,Tao Wang,Bin Zheng
Microbial therapies have promising applications in the treatment of a broad range of diseases. However, effective colonization of the target region by therapeutic microorganisms remains a significant challenge owing to the complexity of the intestinal system. Here, we developed surface nanocoating-based universal platform (SNUP), which enabled the manipulation of controlled release and targeted colonization of therapeutic microbes in the digestive tract without the utilization of any targeting molecules. The system controlled the decomposition time of SNUP in the gut by regulating different modification layers and modification sequences on the microorganism’s surface, so that the microorganism was released at a predetermined time and space. With the SNUP nanomodification technology, we could effectively deliver therapeutic microorganisms to specific complex intestinal regions such as the small intestine and colon, and protect the bioactivity of therapeutic microorganisms from destruction by both strong acids and digestive enzymes. In this study, we found that two layers SNUP-encapsulated Liiliilactobacillus salivarius (LS@CCMC) could efficiently colonize the small intestine and significantly improve the symptoms of a mouse model of Parkinson’s disease through sustained secretion of γ-aminobutyric acid (GABA). This surface nanocoating-based universal platform system does not require the design of specific targeting molecules, providing a simple and universal method for colonized microbial therapy, target theranostics, precision medicine, and personalized medicine.
研究领域:
生物医学工程
·
药学
·
微生物学
·
神经科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）