Journal of the American Chemical Society
·
2020
·
IF 14.612
Xianju Zhang,Xianxin Wu,Xiaoyu Liu,Gaoyu Chen,Yongkai Wang,Jianchun Bao,Xiangxing Xu,Xinfeng Liu,Qi Zhang,Kehan Yu,Wei Wei,Jingjing Liu,Jun Xu,Hua Jiang,Peng Wang,Xun Wang
Perovskite and chalcogenide quantum dots (QDs) are important nano semiconductors. It has been a challenge to synthesize heterostructural QDs combining perovskite and chalcogenide with tailorable photoelectronic properties. In this report, heterostructural CsPbX3-PbS (X = Cl, Br, I) QDs were successfully synthesized via a room temperature in situ transformation route. The CsPbX3-PbS QDs show a tunable dual emission feature with the visible and near-infrared (NIR) photoluminescence (PL) corresponding to CsPbX3 and PbS, respectively. Typically, the formation and evolution of the heterostructural CsPbBr3–PbS QDs with reaction time was investigated. Femtosecond transient absorption spectroscopy (TAS) was applied to illuminate the exciton dynamics in CsPbBr3–PbS QDs. The mild synthetic method and TAS proved perovskite to PbS energy transfer may pave the way toward highly efficient QD photovoltaic and optoelectronic devices.
研究领域:
材料科学
·
光电子学
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DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 21
·16799
·
IF 4.6
Yijian Zhou,Mengting Ji,Shengqian Liang,Jiahang Song,Haotian Wu,Enzhou Liu,Bing Wang,Chen Wang,Bo Zhou,Zhuo Li
Constructing S-scheme heterojunctions is an effective strategy to enhance charge separation efficiency. In this study, for the first time, boron subphthalocyanine bromide (SubPc-Br) was formed by self-assembly on the surface of layer BiOI to form an S-scheme heterojunction (SubPc-Br/BiOI) through halogen bonding and π–π stacking interactions. Experimental results demonstrate that the SubPc-Br/BiOI composite enhances tetracycline removal efficiency by a factor of 1.6 compared to pure BiOI. Notably, after five cycles, the composite still maintains a high tetracycline removal rate, which is 2.62 times that of pure BiOI. DFT and TDDFT theoretical calculations, combined with synchrotron X-ray photoelectron spectroscopy (XPS) under simultaneous illumination, indicate that the internal electric field generated between the [Bi 2 O 2 ] layer and the SubPc-Br macrocycle plays a dominant role in charge separation, while interfacial electron transfer contributes to the constitution of the S-scheme heterojunction. Moreover, the combination of molecular dynamics simulations (MD), Fukui function calculations, and HPLC-MS detection reveals the mechanism of pollutant degradation. This study introduces an innovative strategy for the construction of BiOI-based S-scheme heterojunctions. Constructing S-scheme heterojunctions is an effective strategy to enhance charge separation efficiency.
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DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2015
·Vol. 27
·期 35
·5176-5183
·
IF 17.493
Liu Y,Yang Z,Cui D,Ren X,Sun J,Liu X,Zhang J,Wei Q,Fan H,Yu F,Zhang X,Zhao C,Liu SF.
Two-inch-sized perovskite crystals, CH3 NH3 PbX3 (X=I, Br, Cl), with high crystalline quality are prepared by a solution-grown strategy. The availability of large perovskite crystals is expected to transform its broad applications in photovoltaics, optoelectronics, lasers, photodetectors, LEDs, etc., just as crystalline silicon has done in revolutionizing the modern electronics and photovoltaic industries.
研究领域:
材料科学
·
光电子学
·
光伏技术
·
晶体生长
·
半导体物理
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DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Zhongwei Zhang,Wenjing Xu,Chengyan Liu,Fucong Li,Hengquan Yang,Xiaoyang Wang,Jie Gao,Chen Chen,Qian Zhang,Jing Liu,Xiaobo Bai,Ying Peng,Lei Miao
As a potential thermoelectric (TE) candidate with a rock salt structure similar to PbTe, SnTe has attracted much attention in recent years. However, a high carrier concentration caused by its inherent Sn vacancy severely lowers the TE performance. In this study, it is found that the introduction of Br on the basis of Se doping not only manipulates the carrier concentration but also reduces the solubility of SnSe in SnTe to form SnSe nanoprecipitates with suitable sizes (<10 nm) to scatter phonons. Thereby, the power factor is improved (∼1943 μW m–1 K–2) and the thermal conductivity is reduced (∼2.13 W m–1 K–1), pushing the zT value up to ∼0.75 (Sn1.03Se0.12Te0.870Br0.010) at 823 K. This study combines the carrier and chemical solubility engineering by halogen doping and provides an approach to improve the TE performance of materials with similar structures.
研究领域:
材料科学
·
热电学
·
半导体物理
·
纳米材料
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Mao-Yin Ran,Sheng-Hua Zhou,Wenbo Wei,Bang-Jun Song,Yong-Fang Shi,Xin-Tao Wu,Hua Lin,Qi-Long Zhu
Inorganic chalcohalides are attracting a tremendous amount of attention because of their remarkable structural variety and desirable physical properties. Although great advances have been made in recent years, functional inorganic chalcohalides with two-dimensional neutral layers are still rare. Herein, two novel chalcohalides CdSnSX2 (X = Cl or Br) with high yields were obtained by reacting CdX2 with SnS using a traditional solid-state method at 823 K. Both of these chalcohalides adopt orthorhombic space group Cmcm (No. 63) with the following structural values: a = 4.014(4)–4.064(2) Å, b = 12.996(2)–13.746(3) Å, c = 9.471(2)–9.621(2) Å, V = 494.1(8)–537.5(2) Å3, and Z = 4. The prominent architectural feature is the unique two-dimensional [CdSnSX2] neutral layer consisting of composite [CdX2] and [SnS] sublattices that are connected alternately through the Cd–S–Sn bonds along the ac plane. The [CdX2] sublattice consists of a single octahedral chain of Cd-centered [CdX4S2] groups sharing cis-X edges, while the [SnS] sublattice consists of a bend-shaped chain of unusual [SnS2X2] units sharing vertices of S atoms. Significantly, each CdSnSX2 form (X = Cl or Br) shows high visible-light-induced photocatalytic activity for rhodamine B degradation, which is ∼7.0 times higher than that of nitrogen-doped TiO2 (TiO2–xNx) under the same experimental conditions. This discovery enriches the categories of inorganic chalcohalides and provides more choices of candidate materials for photocatalytic applications.
研究领域:
无机化学
·
材料科学
·
光催化
·
固态化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yali Wang,Hongbao Ren,Ruizhi Cui,Bo Zhang,Qiuye Yang,Wu Li
A glycerol-water coordination method was developed to prepare high-pure KCl from K(Cl, Br) solid solutions. • Glycerol inhibits Br − from entering the KCl lattice. 30 wt% mixed solvent shows better separation performance. • KCl with 99.994% purity and 97.30% yield was obtained, while bromide was concentrated in the liquid phase. High-purity KCl is essential for semiconductors and laser crystals, yet even trace bromine severely compromises its performance. During the preparation of KCl via underground brine crystallization, Br − readily enters the KCl lattice to replace Cl − , forming crystals with a single-salt structure rather than a simple mixture. This makes it difficult to use conventional separation methods to produce high-purity KCl. To address this issue, this study proposes a separation strategy that involves intervening in the recrystallization process by regulating coordination interactions within the solvent system, thereby yielding ultra-pure potassium chloride. Systematic studies involving phase equilibrium experiments, solid-liquid phase characterization and molecular simulations indicate that as the number of hydroxyl groups in the alcohol molecule increases, the solvent's separation capacity increases accordingly, with glycerol exhibiting the best performance. As the simplest trihydric alcohol, glycerol's three hydroxyl groups create distinct solvation environments for Cl − and Br − , thereby inhibiting Br − from occupying the KCl lattice during the concentration and crystallization processes. Furthermore, the introduction of 30 wt% mass water inhibits intermolecular hydrogen bonding and self-aggregation of glycerol, releasing free coordination sites and significantly increasing the solubility of KCl in the system (from 1.7 wt% to 9.63 wt%), thereby further optimizing separation efficiency. The separation process, designed based on the phase diagram of the KCl − KBr − Gly(30 wt%) − H₂O system at 298.15 K, enables the efficient recovery of high-purity KCl (purity up to 99.9940%, recovery rate of 97.30%) and the simultaneous enrichment of bromine resources in the liquid phase (bromine content increased from 3.36 wt% to 44.30 wt%).
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DOI
高影响因子
Science China-Technological Sciences
·
2020
·Vol. 64
·期 1
·91-97
·
IF 2.302
Cao Yong,Li Jian,Yang Peng,Wei KaiYuan,Ma ShiPing,Zhang XiaoQiang,Wu MeiFen,Liu XiaoJiang,Cui YanHua,Wen ZhaoYin
NiCl 2 with high theoretical voltage and thermal decomposition temperature attracts much attention as cathode material for thermal batteries with the requirement of high power density, high energy density and long work time. Unfortunately, the practical utilization of thermal batteries with NiCl 2 cathode is limited by their poor electrochemical performance under large current, even with the conventional LiF-LiCl-LiBr all-lithium molten salt electrolyte which proposes ultrahigh lithium ion conductivity. In this work, an unexpected ionic exchange reaction between NiCl 2 and LiBr in LiF-LiCl-LiBr was found, which would be the main reason for the poor electrochemical behavior of thermal batteries with NiCl 2 cathode and LiF-LiCl-LiBr molten salt. On this basis, LiF-LiCl-Li 2 SO 4 , another all-lithium molten salt free of LiBr, was investigated as the new electrolyte for NiCl 2 cathode. For the single cell of Li(Si)/LiF-LiCl-Li 2 SO 4 /NiCl 2 , a discharge capacity of 377 mA h g −1 (with a cut-off voltage of 1.2 V) was achieved with large current density (500 mA cm −2 ) applied at 520°C, which is almost twice of that of Li(Si)/LiF-LiCl-LiBr/NiCl 2 (190 mA h g −1 ) at the same conditions.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 33
·2204138
·
IF 17.521
Cuiling Zhang,Chong Liu,Yanyan Gao,Shusheng Zhu,Fang Chen,Boyuan Huang,Yi Xie,Yaqing Liu,Mengen Ma,Zhen Wang,Shaohang Wu,Ruud E. I. Schropp,Yaohua Mai
Indoor photovoltaics (IPVs) are expected to power the Internet of Things ecosystem, which is attracting ever-increasing attention as part of the rapidly developing distributed communications and electronics technology. The power conversion efficiency of IPVs strongly depends on the match between typical indoor light spectra and the band gap of the light absorbing layer. Therefore, band-gap tunable materials, such as metal-halide perovskites, are specifically promising candidates for approaching the indoor illumination efficiency limit of ∼56%. However, perovskite materials with ideal band gap for indoor application generally contain high bromine (Br) contents, causing inferior open-circuit voltage ( V OC ). By fabricating a series of wide-bandgap perovskites (Cs 0.17 FA 0.83 PbI 3− x Br x , 0.6 ≤ x ≤ 1.6) with varying Br contents and related band gaps, it is found that, the high Br vacancy (V Br ) defect density is a significant reason that leading to large V OC deficits apart from the well-accepted halide segregation. The introduction of I-rich alkali metal small-molecule compounds is demonstrated to suppress the V Br and increase the V OC of perovskite IPVs up to 1.05 V under 1000 lux light-emitting diode illumination, one of the highest V OC values reported so far. More importantly, the modules are sent for independent certification and have gained a record efficiency of 36.36%.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 31
·期 6
·065603
·
IF 3.399
Chun Sun,Le Wang,Sijing Su,Zhiyuan Gao,Hua Wu,Zi-hui Zhang,Wengang Bi
White light-emitting diodes (WLEDs) based on all-inorganic perovskite CsPbX3 (X = Cl, Br, I) quantum dots (QDs) have attracted much attention and rely on mixing several colors of perovskites. However, this inevitably leads to a non-uniform light distribution and serious light loss. Here, a novel strategy was demonstrated to obtain white emission by combining the orange and blue emission from CsPb/Mn(Cl/Br)3 QDs. Notably, highly efficient white emission with a photoluminescence quantum yield of 94% was achieved by an anion exchange surface engineering (AESE) strategy. After AESE treatment the surface traps can be eliminated, resulting in improved exciton and Mn2+ emission. A prototype WLED device was fabricated and exhibited excellent optical stability, demonstrating great potential for perovskite QDs in the field of optoelectronics.
研究领域:
材料科学
·
光学工程
·
电子与通信技术
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Shuoshuo Zang,Guoqing Xu,Renci Yang,Qinyi Zhu,Hewen Liu
It is still challenging to achieve both good stability and high PLQYs for perovskite NCs because of their ionic nature and structural defects. In this work, tungstosilicic acid (TSA) is used for the surface passivation of cesium lead halide perovskite NCs. Near-unity PLQY is achieved for CsPbBr3 NCs after surface passivation with a suitable amount of TSA. XRD in conjunction with XPS analysis shows that TSA binds hydrophobic chains of OAm onto the surface of CsPbBr3 NCs. XPS results also demonstrate that TSA passivation can change the charge distribution of the cations on the surface layers, which can enhance the interaction with surface traps. PL decay analysis reveals that trap states arising from the surface defects are significantly decreased after TSA passivation. TSA-passivated CsPbBr3 NCs demonstrate long-term ambient stability and good resistances to polar solvents and maintain about 80% of their initial PL intensity after storage under ambient conditions for 50 days. It is further found that TSA passivation is able to improve the PLQYs of a broad spectrum of CsPbX3 (X = Cl, Br, I) NCs without hindering the tunability of the band gaps and PL colors of CsPbX3 NCs via anion exchange.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 4
·2208841
·
IF 19.924
Jinshuai Zhang,Chun Li,Yin Liang,Jiepeng Song,Qiuyu Shang,Liyun Zhao,Huifeng Tian,Lei Liu,Qing Zhang
Suspended nano/microstructures on semiconductor surfaces that can manage light are attractive for various on-chip and efficiency-enhanced optoelectronics. Hybrid halide perovskites have shown considerable potential for optoelectronic and photonic applications. However, the ionic and soft lattices of perovskites are sensitive to polar solvents, photons, and heat, limiting the post-processing of suspended microstructures. Herein, a solution-processed selective area homoepitaxial growth (SAEG) method is introduced to create well-ordered, suspended microstructure arrays on the surface of MAPbX 3 (X = Br, Cl) single-crystalline thin films. The suspended micro-arrays exhibit single crystalline structures and 11.2 fold photoluminescence enhancement compared to the thin-film substrates. The success of SAEG lies in the making use of perovskite supersaturated HX aqueous solutions that not only repair surface defects induced by lithography but also satisfy homoepitaxial growth kinetics. This study paves a pathway for the fabrication of cost-effective perovskite surface-suspended microstructures for efficiency-enhanced and on-chip optoelectronic devices.
研究领域:
材料科学
·
光学
·
半导体技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Ruijing Fu,Junpeng Gao,Pinsen Zhang,Lingrui Wang,Bo Wang,Guangxia Wang,Xiaoshuang Li,Youchao Kong,Qingguang Zeng,Guanjun Xiao
Manganese (Mn)-based organic–inorganic metal halides (OIMHs) are extensively employed in various optical applications due to their non-toxicity, superior optical properties, and tunable emission advantages. Developing effective strategies to enhance the optical properties of these materials and clarifying their structure–optical property relationships continue to be of significant interest. Here, we report that the zero-dimensional (0D) (C24H20P)2MnBr4 exhibits remarkable pressure emission tuning that shifts from green to red, a phenomenon driven by the enhancement of the crystal field splitting energy and the reduced energy difference of the lowest d–d transition (4T1 → 6A1) motivated by the shortening of Mn–Br bonds. Additionally, the band gap value of (C24H20P)2MnBr4 becomes 3.13 eV, showing an unexpected decrease by 1.09 eV from an initial value of 4.22 eV, when the pressure is released from 31.0 GPa. The incomplete recovery of the distortion in [MnBr4]2− tetrahedra, impeded by the distortion of soft organic macromolecules, is believed to be responsible for band gap narrowing. Combined with computations and subsequent experiments, it is inferred that pressure induced reduction in the Mn–Br bond distance contributes to the distortion of tetrahedral [MnBr4]2− and larger-sized organic cations. Our work not only elucidates the structure–optical property relationships in Mn-based OIMHs, but also opens new avenues for modulating their optical properties and devising innovative strategies for designing novel Mn-based OIMHs.
研究领域:
材料科学
·
光学
·
化学
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DOI
高影响因子
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