JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 22
·13203-13211
·
IF 2.599
Zhang Li-Ying,Zhang Yong,Guan Wei-Bao,Wang Ke-Fan,Cheng Zhen-Xiang,Wang Yuan-Xu
Perovskite solar cells single-doped with Br − or Cs + ions have been proved to be an effective approach to improve their efficiency and stability. In our work, we took advantage of co-doping with Br − and Cs + . At our studied doping levels from CH 3 NH 3 I:PbI 2 :CsBr = 1:1:0 ( x = 0) to 0.85:1:0.15 ( x = 0.15), CsBr doping does not introduce any detectable impurity, and the crystal grains grow larger with increasing CsBr doping level. Furthermore, when the CsBr doping level is less than x = 0.1, it can progressively enhance the optical absorption of the perovskite film, although the absorption begins to decrease when the doping level rises above x = 0.1. X-ray photoelectron spectroscopy measurements show that Br − has successfully replaced I − and bonds with Pb 2+ after CsBr doping. At the optimized doping level of x = 0.1, the incorporation of CsBr in the reaction system can improve the morphology of perovskite films and greatly enhance the efficiency from 9.8% for undoped sample to 13.6%, better than single Br − or Cs + doping. Our result shows that CsBr doping is an effective method to enhance the efficiency of perovskite solar cells.
研究领域:
材料科学
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能源技术
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高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Xiaoxian Song,Fuguo Wang,Hongwen Li,Haiting Zhang,Ze Xu,Dongdong Wei,Jingjing Zhang,Zijie Dai,Yunpeng Ren,Yunxia Ye,Xudong Ren,Jianquan Yao
Ultraviolet–visible–near-infrared broad-band PDs have attracted great attention for imaging systems and optical communications. Previous UV–NIR PDs have mainly worked in a single band. UV–NIR dual-modal detectors, which maintain a greater light response through nonlinear light absorbance in the second mode, remain to be explored. Here, a CsPbI2Br dual-mode PD is reported for the first time. The light absorption, phase stability, and chemical stability of CsPbI2Br are enhanced by CsBr and H2O. The device shows (UV–vis)/NIR absorption through one-photon and two-photon absorption. The CsPbI2Br PD has excellent (UV–vis)/NIR dual-mode detection performance under ultraviolet (405 nm), visible (532 nm) and near-infrared (808 nm) illumination, respectively; the device has high responsivities of 160, 36, and 118 A/W, specific detectivities of 4.9 × 1011, 6.3 × 1010, and 2.1 × 1011 jones and response times of 5.5/6.8, 5.3/5.9, and 5.9/6.4 ms, respetively. This work provides a route for UV–NIR dual-mode detection and promotes the applications of these PDs in photoelectric devices for weak light and wide spectrum detection.
研究领域:
材料科学
·
光电技术
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
IF 6.019
Sixuan Chen,Jingjing Dong,Jian Wu,Shaochuan Hou,Jie Xing,Hao Liu,Huiying Hao
For future mass production, it is the best choice to fabricate highly efficient and stable perovskite solar cells (PSCs) in the ambient air. Interface modification is widely reported as an effective method for boosting the power conversion efficiency (PCE) and stability of PSCs. In our manuscript, CsBr as the interface modification material was introduced into the mesoporous TiO 2 (mp-TiO 2 ) via two ways: doping into the mp-TiO 2 layer and inserting between the mp-TiO 2 and perovskite films. It was found that CsBr interface modification, especially by doping into the mp-TiO 2 layer, can passivate the trap states originated from V O in mp-TiO 2 leading to enhanced carrier transport properties, meliorate surface property of mp-TiO 2 resulting in high-quality perovskite films, improve the carrier extraction and decrease the trap recombination in the interface. High-quality perovskite films, with increased grain size , reduced grain boundaries and pinholes, were obtained after CsBr modification, and further applied for the PSCs. The whole preparation process of the PSCs was finished in ambient air. The champion device with CsBr doped into the mp-TiO 2 layer yielded a highest PCE of 17.33%, while the pristine device showed a PCE of 14.95%. Furthermore, the champion PSC with CsBr doped into the mp-TiO 2 layer exhibited a much better stability, which could maintain over 80% of the original PCE after 1000h storing in ambient air without any encapsulation. This work presents an approach to develop air-processed efficient and stable PSCs by interface modification for future mass production.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Jingshan Cui,Zhurui Shen,Gaoqing Cao,Xiangxu Zhao,Weizun Li
To address the global challenge posed by excessive carbon dioxide emissions, our research pioneers the transformation of CO 2 into valuable hydrocarbon fuels. Central to this approach is the innovation of photocatalysts, engineered to exhibit exceptional photoresponse characteristics. In this research, the CsBr@CuBr 2 photocatalyst was innovatively synthesized through a straightforward and effective one-pot method. The catalyst displayed remarkable efficacy, achieving a CO 2 photoreduction rate of 201.47 μmol g −1 within just 4 h. The incorporation of CsBr into CuBr 2 effectively captures excited-state electrons, thereby significantly enhancing charge separation efficiency. Utilizing in situ DRIFTS and DFT theoretical analysis, the experiment reveals the complex process of CO 2 photoreduction to CO. The results of this experiment provide breakthrough insights for the systematic design of metal bromide heterostructures, which possess robust CO 2 adsorption/activation potential and notable stability.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shuang Yang,Yinan Lao,Wenjin Yu,Zhenyu Tang,Haoqing Guo,Ganghong Liu,Bo Qu,Lixin Xiao,Zhijian Chen
Tin-based perovskites comprise one of the preferred nontoxic alternatives to Pb-based perovskites due to their desirable optoelectronic properties. However, there remains a crucial stability problem due to the property of Sn2+ oxidation. In this study, we reported stable tin-based perovskite nanocrystals (NCs) using stannous acetate as the Sn2+ source because of its stronger Sn–O bonding. To prevent the oxidation of Sn2+, a thin layer of CsBr coverage was formed in situ; tin-based perovskite NCs, CsxSnBrx+2@CsBr (1 < x < 4), show a high photoluminescence quantum yield (PLQY) of 78.2% and high stability. The measured lifetime of PLQY decrease to half of the initial value is ∼1287 h under ambient conditions and ∼2200 h under a nitrogen atmosphere, respectively. Furthermore, the as-fabricated light-emitting diodes based on CsxSnBrx+2@CsBr NCs as the emitting layer exhibit a maximum luminescence of 16 cd/m2 and an external quantum efficiency of 0.035% with peaks at 451 and 615 nm, corresponding to the emissions of CsBr and CsxSnBrx+2, respectively. This work provided a new way to obtain stable Sn-based perovskite NCs and exhibited their potential for application in white light-emitting diodes (LEDs).
研究领域:
材料科学
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纳米技术
·
光电
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Zhan-Ping Qiao,Xin Chen,Qi-Chao Yang
Using an isothermal equilibrium method, the phase equilibrium of the ternary systems CsCl–CdCl 2 –H 2 O and CsBr–CdBr 2 –H 2 O were studied at T = 298.1 K. In the phase diagram of the system CsCl–CdCl 2 –H 2 O, the solid phases of CsCdCl 3 and Cs 2 CdCl 4 , besides CsCl and CdCl 2 ·2.5H 2 O, were discovered. The phase diagram of the system CsBr–CdBr 2 –H 2 O contains five crystallization fields for the solid phases CdBr 2 ·4H 2 O, CsCdBr 3 , Cs 5 Cd 2 Br 9 , Cs 3 CdBr 5 and CsBr. The new solid phases of CsCdCl 3 and CsCdBr 3 are congruently soluble, and Cs 2 CdCl 4 , Cs 5 Cd 2 Br 9 and Cs 3 CdBr 5 are incongruently soluble in the aqueous system. The experimental solubility data and phase diagram s for the ternary systems show more practical application for the obtained cadmium-based halide perovskite. The five new solid phase have been analyzed by X-ray diffraction and thermogravimetry/derivative thermogravimetry. By measuring the standard molar enthalpies of solution of the compounds, the standard molar enthalpies of formation of CsCdCl 3 , Cs 2 CdCl 4 , CsCdBr 3 , Cs 5 Cd 2 Br 9 , Cs 3 CdBr 5 were determined to be –(873.3 ± 0.7) kJ·mol −1 , –(1325.6 ± 0.9) kJ·mol −1 , –(742.8 ± 0.7) kJ·mol −1 , –(2710.0 ± 1.3) kJ·mol −1 and –(1558.1 ± 1.0) kJ·mol −1 , respectively.
研究领域:
物理化学
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材料科学
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热力学
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高影响因子
Nanoscale Advances
·
2020
·Vol. 2
·期 5
·1973-1979
·
IF 0
Xin Liu,Zhao Luo,Wenxu Yin,Aleksandr P. Litvin,Alexander V. Baranov,Jiaqi Zhang,Wenyan Liu,Xiaoyu Zhang,Weitao Zheng
Formation of a non-emissive wide bandgap CsPb2Br5 component often accompanies the synthesis of CsPbBr3 perovskites, introducing undesired energy states and impeding the charge transport. Here, we demonstrate that a small amount of a methanol additive can promote the CsBr release rate, facilitating CsPbBr3 formation and suppressing CsPb2Br5 formation. Some of the methanol ionizes into CH5O+ and CH3O−, which act as surface ligands and change the crystallization environment, inducing shape evolution from spherical nanocrystals to rectangular nanoplatelets (NPLs), leading to monodispersed and phase-pure 8 unit-cell-thick CsPbBr3 NPLs. Meanwhile, nonradiative recombination processes are inhibited as a result of NPL surface passivation. Bright CsPbBr3 NPLs with a photoluminescence quantum yield reaching 90% were employed as emitters for electroluminescent light-emitting devices.
研究领域:
材料科学
·
光学
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DOI
PubMed
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qing Xu,Tianwei Zhang,Mengjia Liu,Min Wang,Kun Cao,Rong Chen
Luminescent perovskite nanocrystals (NCs), possessing the advantages of low cost, easy detection, and excellent luminescence, are becoming more and more significant in the fields of information encryption and decryption. Most hydrochromic perovskite NCs for information encryption have moderate reversibility and are easily passively decrypted by water in the moist air, limiting their practical applications. Herein, a lyochromic material is synthesized based on reversible phase transition between luminescent CsPbBr3–HBr (pretreating CsPbBr3 with HBr) and nonluminescent Cs4PbBr6, exhibiting excellent reversibility in 50 cycles triggered by CsBr solution. HBr treatment boosts the ion migration of NCs via diminishing surface ligands and passivating Br vacancy, assisting CsBr concentration acting as a crucial factor in dynamic ion exchange equilibrium between the trigger solution and CsPbBr3–HBr. By utilizing CsPbBr3–HBr as a safety ink, the CsBr-triggered photoluminescence switch has been demonstrated to be reproducible, stable, and reliable for information encryption and decryption.
研究领域:
材料科学
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光学
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PubMed
高影响因子
Nano-Micro Letters
·
2024
·
IF 31.6
Juan Zhang,Xiaofei Ji,Xiaoting Wang,Liujiang Zhang,Leyu Bi,Zhenhuang Su,Xingyu Gao,Wenjun Zhang,Lei Shi,Guoqing Guan,Abuliti Abudula,Xiaogang Hao,Liyou Yang,Qiang Fu,Alex K.-Y. Jen,Linfeng Lu
High-quality large-area perovskite films are prepared using a solid–liquid two-step film formation method combined with CsBr modification for the buried interface and Urea additive for perovskite crystallization. The inverted perovskite solar modules’ performance is enhanced to 20.56% in 61.56 cm 2 with improved stability. Supplementary Information The online version contains supplementary material available at 10.1007/s40820-024-01408-2.
研究领域:
材料科学
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可再生能源
·
光伏技术
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DOI
PubMed
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2018
·
IF 2.447
Hao Tang,Yunfeng Du,Yingru Li,Ming Wang,Huaisheng Wang,Zhenliang Yang,Bingqing Li,Rui Gao
The electrochemistry of UBr 3 was studied on W working electrodes in LiBr-KBr-CsBr eutectic salt at 623 K. The U(III)/U (0) redox reaction was evaluated with respect to its electrochemical behavior, diffusion and electrocrystallization properties. According to cyclic voltammetry and square wave voltammetry , the reduction of U(III) ions to U (0) metal is a one-step three-electron reaction and the oxidation of U(III) ions is an one-electron transferred reaction. Cyclic voltammograms at varied scan rates show that U(III)/U (0) redox reactions are quasi-reversible. Chronopotentiometry and Sand's equation were used to determine the diffusion coefficients of U(III) ions. The nucleation mechanisms of uranium metal deposited on W substrates with different UBr 3 concentrations were predicted by using Scharifker-Hill model, which shows that the nucleation and growth mode changes from progressive mechanism to instantaneous mechanism with an increasing concentration of UBr 3 in the salt. At 623 K, potentiostatic electrodeposition was conducted to prepare mass uranium. The current-time evolution curve indicates that the actual surface area of electrodeposits keeps stable. Furthermore, the macroscopic appearance and microcosmic morphology show compact structure, rather than dendrites. Bulk uranium metal was further analyzed by inductive coupled plasma atomic emission spectrometer and X-ray diffraction, which indicate that the compact uranium is high-purity metal.
研究领域:
电化学
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核材料科学
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熔盐化学
·
电冶金
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DOI
高影响因子
Applied Physics Reviews
·
2024
·Vol. 11
·期 3
·
IF 11.9
Wang Jindi,Li Mingyang,Fan Wenxuan,Xu Leimeng,Yao Jisong,Wang Shalong,Song Jizhong
Perovskite quantum dot-based light-emitting diodes (QLEDs) have been considered as a promising luminescent technology due to high color purity and wide color gamut. However, the realization of high-performance QLED is still hindered by near-perfect quantum dots (QDs) with efficient and stable exciton recombination behavior. Here, we proposed a ligand compensation (LC) strategy to optimize the QDs by introducing a ligand pair of tri-n-octylphosphine (TOP) and CsBr. The ligand pair could enhance the clarity and colloidal stability of the QD ink, facilitating the fabrication of highly smooth films. On one hand, TOP engages in interactions with Pb and effectively passivates the surface uncoordinated Pb 2+ . On the other hand, the supplement of CsBr provides a Br-rich environment to reduce Br vacancies (V Br ). Through LC, QD films possess a high photoluminescence quantum efficiency of 82% and a shallow hole level, which enables efficient exciton recombination. In addition, the LC makes QD films exhibit stable exciton combination behavior and electrical transport characteristics. Resultantly, the LC-optimized QLEDs show a maximum external quantum efficiency (EQE) of 24.7% and an operational lifetime T 50 of 182 h at an initial luminance of 100 cd m −2 , which is obviously higher than that of the control device (EQE of 15.8%, T 50 of 11 h). The proposed LC strategy for optimizing perovskite QDs presents a novel concept for achieving high-performance QLEDs and holds great potential for widespread application in various optoelectronics.
研究领域:
材料科学
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光电技术
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纳米技术
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DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2025
·Vol. 55
·期 3
·366-381
·
IF 1.3
Zhou Jinpeng,Du Yanping,Xie Peijing,Liu Bin,Xue Ning,Hou Haiyun,Wang Ning,Zheng Lina
The thermodynamic properties of electrolyte solutions elucidate the mechanisms of ionic interactions in solution. This study investigates the thermodynamic properties of the ternary systems containing cesium bromide (CsBr), water, and either 1,2-butanediol (1,2-BDO) or 1,4-butanediol (1,4-BDO) at 298.2 K utilizing potentiometric techniques. CsBr molalities were in the approximate range of 0.01 to 1 mol·kg −1 , and the mass fraction of 1,2-BDO/1,4-BDO in 1,2-BDO/1,4-BDO+H 2 O binary mixed solvents were 0, 0.10, 0.20, and 0.30. The Debye-Hückel model, the Pitzer model, along with the Nernst equation were explored to determine the thermodynamic parameters, which included the mean ionic activity coefficients ( γ ± ), osmotic coefficients ( φ ), excess Gibbs free energy ( G E ), standard Gibbs free energy of transference (Δ G
0 t
), and primary hydration number ( n hydr ). The results reveal that the γ ± of CsBr decreases with increasing the molality of CsBr and with increasing the mass fraction of 1,2-BDO and 1,4-BDO in the binary mixture. A positive value for the Δ G
0 t
signifies that the transfer of CsBr from pure water to the mixed solvent system is thermodynamically unfavorable and thus non-spontaneous. These findings can provide thermodynamic data to support potential industrial processes.
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高影响因子
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