ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Qipeng Cao,Songwang Yang,Qianqian Gao,Lei Lei,Yu Yu,Jun Shao,Yan Liu
The crystal growth process significantly influences the properties of organic–inorganic halide perovskite films along with the performance of solar cell devices. In this paper, we adopted the microwave irradiation to treat perovskite films through a one-step deposition method for several minutes at a fixed output power. It is found that the specific microwave irradiation process can evaporate the solvent directly and heat perovskite film quickly. In comparison with the conventional thermal annealing process, a microwave irradiation process assisted fast and controllable crystallization of perovskite films with less energy-loss and time-consumption and therefore resulted in the enhancement in the photovoltaic performance of the corresponding solar cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 17
·期 4
·2200871
·
IF 11
Shuxin Wang,Yongjie Liu,Chenwei Liu,Wenlong Shao,Chen Wang,Meng Xiao,Guoyi Chen,Zhiqiu Yu,Chen Tao,Weijun Ke,Guojia Fang
Perovskites are promising light emitters that can cover broad-range emissions over the entire visible spectrum. However, few studies have focused on uncommon wavebands, such as far-red emission of 700–750 nm that has broad applications in biology, horticulture lighting, optogenetics, etc. Here, a strategy is demonstrated to achieve high-performance far-red perovskite light-emitting diodes (PeLEDs) through antisolvent engineering. First, 1,3,5-tris(1-phenyl-1H-benzimidazole-2-yl) benzene (TPBi) is introduced into n-i-p perovskite matrix not only to passivate the defects but also to balance carrier mobility as well as adjust the energy level alignment between perovskite and the electron transport layer. The n-type TPBi can prevent hole carriers’ movements in perovskite light emitters and enhance electron injection. Furthermore, the incorporation of TPBi uplifts the Fermi energy level of perovskites by 0.32 eV as well as diminishes the conduction band offset between zinc oxide (ZnO) and the perovskite emitters, hence alleviating the accumulation of charges at the interface. Consequently, the PeLEDs with TPBi-modified perovskite emitters show an invariable far-red emission peak at around 735 nm with a champion external quantum efficiency of 14.22%. This work makes up the far-red emission of perovskite light-emitting devices and boosts latent capacity of PeLEDs for future application.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
ACS Nano
·
2018
·
IF 13.709
Jian Mao,Hong Lin,Fei Ye,Minchao Qin,Jeffrey M. Burkhartsmeyer,Hong Zhang,Xinhui Lu,Kam Sing Wong,Wallace C. H. Choy
We demonstrate all-perovskite light-emitting diodes (PeLEDs) with white emission on the basis of simultaneously solving a couple of issues including the ion exchanges between different perovskites, solvent incompatibility in the solution process of stacking different perovskites and carrier transport layers, as well as the energy level matching between each layer in the whole device. The PeLEDs are built with a two-dimensional (CH3CH2CH2NH3)2CsPb2I7 perovskite that emits red light, CsPb(Br,Cl)3 quantum dots that emit a cyan color, and an interlayer composed of bis(1-phenyl-1H-benzo[d]imidazole)phenylphosphine oxide (BIPO) and poly(4-butylphenyl-diphenyl-amine) (Poly-TPD). The interlayer is designed to realize desirable white electroluminescence by tuning the electron and hole transportation and distribution in-between multilayers. With this PeLED configuration, we achieve the typical white light with chromaticity coordinates of (0.32, 0.32) in Commission Internationale de L’Eclairage (CIE) 1931 color space diagram and steady CIE coordinates in a wide range of driving current densities (from 2.94 to 59.29 mA/cm2). Consequently, our work, as the starting point for future research of all-perovskite white PeLEDs, will contribute to the future applications of PeLEDs in lighting and display. In addition, we believe that the proposed material and all-perovskite concept will leverage the design and development of more perovskite-based devices.
研究领域:
材料科学
·
光电工程
✓ 已验证
DOI
高影响因子
Solar RRL
·
2021
·Vol. 6
·期 1
·2100731
·
IF 8.582
Ruonan Zhou,Xingchong Liu,Haimin Li,Hanyu Wang,Yukun Ouyang,Xiaoli Gong,Xian Peng,Huxin Luo,Yafei Ni,Wenjing Zou,Yue Lei
Intrinsic defects are key factors that would affect the performance and stability of perovskite solar cells (PSCs). Herein, a sulfonamides additive, methyl 3-sulfamoyl-2-thiophenecarboxylate (MSTC), is introduced into the PbI 2 or FAI/MACl/MABr precursor solution, to prepare high-quality PSCs with a two-step method. After the addition of MSTC, all the devices show enhanced performance. With optimized MSTC incorporated into PSCs, the champion power conversion efficiency (PCE) of the PSCs is increased from 19.19% to 22.14%, and the stability is also improved. The MSTC-FAI based device can still maintain 89% of its initial PCE compared to 68% of the control one after 15 days in ambient condition under relative humidity of 40–50% at room temperature in dark. Test results reveal that amido group in MSTC would coordinate with PbI 2 or FAI through hydrogen bonding (NH···I), thus effectively enhancing the performance of devices. Nevertheless, the sulfonyl and carbonyl groups in MSTC would coordinate with the FAI precursor through chemical bond of C O S and C O C. And with the hydrogen bonding connection between MSTC and FAI, the inherent defects in the MSTC-FAI based device are effectively suppressed, leading to the enhanced photovoltaic performance.
研究领域:
材料科学
·
能源技术
·
化学工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Meng-Juan Yang,Shu-Yu Tang,Yan-Ran Weng,Feng Zhou,Yu Shi,Yong-Ju Bai,Yong Ai
Hybrid organic–inorganic perovskites (HOIPs) have emerged as multifunctional materials with remarkable optical and electronic properties. In particular, 2D-layered lead iodide-based HOIPs possess great practical application potential in the photoelectric field. In this work, we report H/F substitution-induced 1D-to-2D increment of lead iodide HOIPs. The enantiomeric HOIPs, S- and R-FPPbI3 (FP = 3-fluoropyrrolidinium), were achieved by monofluoride substitution on the spacer cations of the parent HOIP, PyPbI3 (Py = pyrrolidinium), showing mirror image structural relationship and reversible solid-state phase transition. A 2D-layered HOIP, (DFP)2PbI4 (DFP = 3,3-difluoropyrrolidinium), was achieved with a low band gap of 2.09 eV through difluoride substitution, thanks to the expansion of the Pb–I network from 1D to 2D. This work highlights the exploration of 1D chiral and 2D-layered HOIP materials with reversible phase transitions through H/F substitution strategies.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Chenwei Xu,Chenxia Li,Degang Deng,Hua Yu,Le Wang,Changyu Shen,Xufeng Jing,Shiqing Xu
A series of new double perovskite structure CaLaMgTaO 6 : Bi 3+ , Eu 3+ phosphors were synthesized by high-temperature solid-phase method. The crystal structure, luminescence characteristics and temperature sensing performance have been systematically studied. The substitution rule of Bi 3+ in CLMT and its luminescence characteristics are described. The decay curve of Bi 3+ further proves the existence of an energy transfer from Bi 3+ to Eu 3+ . They have different thermal quenching behaviors, and their fluorescence intensity ratio (FIR) parameter has tremendous temperature sensing performance. Under 329 nm ultraviolet excitation, the emission peaks at 408 nm and 614 nm are used as the reference signal, the largest absolute sensitivity is 0.0127 K −1 at 573 K, and the maximum relative sensitivity is 1.33%K −1 at 483 K. This indicates that CaLaMgTaO 6 : Bi 3+ , Eu 3+ is a material with excellent temperature measurement performance and applicability in non-contact optical thermometers.
研究领域:
材料科学
·
发光材料
·
光学传感
·
无机化学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 10
·5857-5870
·
IF 2.599
Zhao Bei,Shen Dingyi,Tan Qinyue,Tang Jianfeng,Zhou Xianju,Hu Shanshan,Yang Jun
CaF 2 :Ln 3+ (Ln = Ce, Tb, Eu) phosphors with highly uniform shapes have been successfully synthesized by a simple hydrothermal method directly. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL) and lifetime. The results indicated that the pH values, organic additive and reaction time have a significant effect on the morphology and dimensions of CaF 2 microcrystals and the possible formation mechanism was also proposed. Furthermore, the energy transfer from Ce 3+ to Tb 3+ and from Tb 3+ to Eu 3+ and from Ce 3+ to Tb 3+ to Eu 3+ was observed and the corresponding mechanisms were discussed in detail. The CaF 2 :Ln 3+ phosphors may have potential optical applications in near-UV and violet LEDs.
研究领域:
材料科学
·
无机化学
·
光学材料
·
纳米技术
·
固体化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Huaqiao Tan,Zhao Zhao,Wan-bin Zhu,Eric N. Coker,Binsong Li,Min Zheng,Weixing Yu,Hongyou Fan,Zaicheng Sun
A facile and general method has been developed to fabricate oxygen vacancies on perovskite SrTiO3 (STO) nanocrystals through a controllable solid-state reaction of NaBH4 and SrTiO3 nanocrystals. STO samples with tunable color, oxygen vacancy concentration on nanocrystal surface have been synthesized. TEM results reveal that these STO samples have a crystalline core/amorphous shell structure (SrTiO3@SrTiO3–x). XPS and EPR results disclose that the oxygen vacancy concentration increases with the increase of reaction time and temperature. The concentration of oxygen vacancies calculated from TGA data, could reach 5.07% (atom) in this study. UV–vis spectra and photocatalytic results indicate that oxygen vacancies on STO surface play an important role in influencing the light absorption and photocatalytic performance. However, an excess amount of oxygen vacancies leads to a decrease of photocatalytic performance. The optimal photocatalytic activity for H2 production under UV–vis irradiation is up to 2.2 mmol h–1 g–1, which is about 2.3 times than the original SrTiO3, corresponding to 3.28% (atom) of oxygen vacancy concentration.
研究领域:
材料科学
·
光催化
·
纳米材料
·
表面化学
·
能源材料
·
无机化学
✓ 已验证
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2024
·Vol. 37
·期 4
·667-675
·
IF 1.6
Wu Diandian,Liu Xiansong,Han Yuyan,Feng Shuangjiu,Lv Qingrong
A sample of Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 doped with four different ions was prepared using the solid method and a subsequent procedure. X-ray diffraction (XRD), energy-dispersive X-ray (EDX), and scanning electron microscope (SEM) were used to analyze the sample’s structural features, elemental distribution, and surface morphology. The study used the B-H magnetic characteristic analyzer and superconducting quantum interferometer magnetic performance measurement system to analyze the magnetic properties of Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 . The correlation becomes more surprising as the frequency increases, indicating a decrease in permeability when the magnetic field H reaches 200 A/m. Ion substitution leads to changes in magnetic crystal anisotropy, affecting permeability as the external magnetic field strength increases. We analyze the correlation between saturation magnetization and temperature in the 520–540 K range and explain the variation of saturation magnetization with temperature. The study shows that saturation magnetization decreases as temperature increases. This result suggests that saturation magnetization decreases as temperature increases. The increased super-exchange effect due to Ti and Mn occupying the (d) sites is much stronger than the reduced effect caused by Sn occupying the (a) sites. Therefore, the saturation magnetization of the Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 sample is higher than that of the undoped sample. The Curie temperature (Tc) of the Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 sample is lower than that of the undoped sample.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
磁性材料
·
无机非金属材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Qian Zhang,Guoming Li,Zhu Ma,Yi Chen,Zhuowei Du,Wei You,Junbo Yang,Yixian Li,Hao Du,Zhuo Lv,Dengqian Xiang,Bo Chen,Hong Yu,Maozhu Mao,Cheng Huang,Yan Xiang,Jian Yu,Yaohua Mai,Kuan Sun,Ningqiang Xuan,Kai Yue
SnO 2 stands as a prominently employed material as electron transport layer (ETL) for perovskite solar cells (PSCs). Nevertheless, SnO 2 films prepared at low temperatures are accompanied by defects that will influent the transport of carriers at the interface, misalignment of energy levels, and the quality of thin perovskite film formation. Here, we introduce 4-aminobenzoic acid ethyl ester (4-AN), characterized by its carbonyl (C O) and amino (-NH 2 ) groups, as a synergistic defect passivation agent on the surfaces of SnO 2 and perovskite films. This approach aims to enhance the electron transport properties of SnO 2 . By optimizing the energy alignment between SnO 2 and perovskite, 4-AN facilitates more efficient extraction of interfacial carriers, while also promoting the crystalline quality of perovskite films and suppressing carrier recombination at the interface. The long alkyl chains at the end play an important role in relieving the interfacial contact and help to enhance the SnO 2 /perovskite interfacial connection. Compared with pristine SnO 2 , the PSCs based on 4-AN modified SnO 2 obtained an optimal efficiency of 21.83 %, while the devices maintained 90 % and 83 % of their initial PCE after storage for 1000 h in an N 2 environment and humidity of 30–50 %. This work provides valid insights for the development of novel interface modification materials.
研究领域:
材料科学
·
能源化学
·
光电工程
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 7
·2002175
·
IF 6.147
Lu Hou,Yihua Zhu,Jingrun Zhu,Xuyan Li,Feng Zeng,Tingyu Yang,Yiqin Gong,Jianhua Shen,Chunzhong Li
Mn-doped 2D perovskites are emerging as good candidates for light-emitting applications due to their excellent optical and electrical properties. Major synthetic routes, solid-state grinding and high-temperature solution synthesis, are extensively studied to prepare Mn-doped 2D perovskites. However, complicated synthesis, small-scale yields, and poor-stability impede their widespread applications. Herein, a one-step acid-solution-assisted method is exhibited for gram-scale production of Mn-doped 2D (C 8 H 17 NH 2 ) 2 PbBr 4 with a solid yield of 1.35 g products out of 3 mL solvent. After Mn-doped 2D (C 8 H 17 NH 2 ) 2 PbBr 4 being stored in the air for 90 days, the photoluminescence (PL) quantum yield of powders has minor changes, showing good stability. Phosphor-converted monochrome light-emitting diodes (LEDs) are fabricated. After the LEDs work 6 h under a voltage of 3 V, their PL spectra have no obvious change, showing a great potential in optoelectronic devices. This study provides a new effective strategy for large-scale synthesis of ultrastable Mn-doped 2D perovskites, which is expected to provide inspiration for the industrial optoelectronic applications of perovskites.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wei Wang,Wenhua Cheng,Zhenjie Liu,Murong Xi,Zhouliang Tan,Yadong Wang,Weilu Zhang,Pingping Chang,Zihan Qi,Huan Zhou,Han Zhang,Juan Ding,Yudai Huang
The commercialization of Ni-rich layered oxide cathode materials has been severely hampered by rapid capacity degradation and safety issues. Here, we demonstrate a lattice reconstruction strategy to improve the structural and thermal stability of LiNi 0.83 Co 0.11 Mn 0.06 O 2 (NCM83) via calcium. The enhanced stability of NCM83 is ascribed to the formation of Ca-O bond, which is stronger than TM-O (TM=Ni, Mn, Co) bond. The lattice reconstruction enables metal-O (M-O) bond more stable which mitigates the loss of lattice oxygen, thus improving the reversibility of the H2-H3 phase transition in NCM83. Moreover, Ca 2+ acts as a pillar, facilitating the transport of Li + . The lattice-reconstructed Ni-rich cathode material with 0.5 % Ca can maintain a capacity retention ratio of 97.3 % at 1 C after 150 cycles. As compared with the pristine NCM83 cathode, the high-voltage cycling stability at 4.5 V and high-temperature performance at 55 °C are increased by 17.9 % and 12.2 %, respectively. This work actually proposes a new approach to design and construct high-performance Ni-rich cathode materials for practical lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）