Advanced Optical Materials
·
2019
·Vol. 7
·期 19
·1900491
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IF 7.125
Lixiao Yin,Haodi Wu,Weicheng Pan,Bo Yang,Penghua Li,Jiajun Luo,Guangda Niu,Jiang Tang
Cs 2 AgBiBr 6 double perovskite recently emerges as a promising semiconductor for ionization detections because of the low detection limit and nontoxic composition. However, it suffers from unsatisfactory reproducibility and wide fluctuation of electrical properties, as also in other halide perovskite systems. Here, solubility and supersolubility are employed as quantitative indicators to direct the growth of Cs 2 AgBiBr 6 single crystals. The optimized Cs 2 AgBiBr 6 crystals exhibit smooth surface as well as high resistivity with narrow distribution from 6.10 × 10 9 to 3.31 × 10 10 Ω cm, in contrast to the unoptimized Cs 2 AgBiBr 6 crystals ranging from 6.04 × 10 7 to 5.61 × 10 9 Ω cm. Moreover, the fabricated X-ray detector has a sensitivity of 1974 µC Gy air −1 cm −2 under 50 V mm −1 electric field, which is close to lead halide perovskite detectors. This study highlights the importance of quantitative understanding about the growth process, and might also be applicable to other crystal growth methods, for instance, antisolvent or solvent evaporation method.
研究领域:
材料科学
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半导体物理
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晶体生长
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Chongguang Lyu,Chang Liu,Huihua Min,Xinyu Shi,Ran Jiang,Zhikang Ao,Xu Zhang,Chunli Wang,Huifang Ma,Lin Wang
Lead-free double perovskites have been an excellent candidate for resistive memories due to their mixed electronic-ionic properties, remarkable ambient stability and nontoxicity. However, the studies on resistive memories of rare-earth ion doping lead-free double perovskite are scarce to date. Here, we report the lead-free double perovskite Cs 2 AgBiBr 6 films with tuning rare earth Nd 3+ content by the vacuum sublimation and solution processing. The X-ray diffraction (XRD) pattern and scanning electron microscopy (SEM) confirm that Nd-doped Cs 2 AgBiBr 6 films show high crystallinity and phase purity. We also systematically investigate the resistive memory properties of the resulted Cs 2 AgBiBr 6 films doped by different content Nd 3+ . The resistive memory devices demonstrate a typical write-once-read-many-times (WORM) behavior with low on-set voltage and long retention time. Particularly, the ON/OFF ratio of Nd-doped Cs 2 AgBiBr 6 film is 1000 times higher than that of the undoped Cs 2 AgBiBr 6 film. This study exhibits that Nd-doped Cs 2 AgBiBr 6 film provide a new material platform for lead-free perovskite-based application in future electronics and optoelectronics .
研究领域:
材料科学
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电子器件
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DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 28
·14923-14932
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IF 14.511
Qianqian Fan,Siying Wei,Jianzhong Ma,Wenbo Zhang,Lu Wen
In recent years, the focus on lead-free halide perovskite nanocrystals (NCs) has now been shifted to their utilization as photocatalysts due to their strong light absorption and tunable photo-responsive range. Current studies have promised Cs2AgBiBr6 NCs to be a born photocatalytic material that will self-passivate to generate BiOBr when it encounters water. In this work, a unique Cs2AgBiBr6/BiOBr composite was found in water-soaked Cs2AgBiBr6 NCs, which was further diagnosed as a Z-type heterojunction to enhance the photocatalytic process. Meanwhile, variations in the structure and photocatalytic behavior of Cs2AgBiBr6 NCs in RhB solution with different water contents were investigated in detail. Results showed that appropriate water content could accelerate the visible-light-driven degradation of RhB by almost 1.5 times, but excessive water (more than 50 vt%) may result in weak or negative enhancement. Accordingly, the bandgap matching, carrier separation and the resultant photocatalytic mechanism of water-soaked Cs2AgBiBr6 NCs were discussed and proposed. This research will offer a new idea for the application of halide perovskite in a water-involved photocatalytic system.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 12
·1925-1936
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IF 4.5
Ma Jianzhong,Wen Lu,Fan Qianqian,Wei Siying,Hu Xueyun,Yang Fan
In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO 2 in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs 2 AgBiBr 6 double halide perovskite nanocrystals, owing to its strong visible light absorption and tunable band gap. In this work, this photocatalytic process was facilitated by a unique TiO 2 /Cs 2 AgBiBr 6 composite, which was identified as an S-cheme heterojunction. TiO 2 /Cs 2 AgBiBr 6 composite was investigated for its structure and photocatalytic behavior. The results showed that when the perovskite dosage is 40%, the photocatalytic rate of TiO 2 could be boosted to 0.1369 min −1 . This paper discusses and proposes the band gap matching, carrier separation, and photocatalytic mechanism of TiO 2 /Cs 2 AgBiBr 6 composites, which will facilitate the generation of new ideas for improving TiO 2 ’s photocatalytic performance.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Senlin Zhang,Yiming Yuan,Jianmin Gu,Xiaoyan Huang,Peng Li,Ke Yin,Zhourong Xiao,Desong Wang
Lead-free Cs 2 AgBiBr 6 double-perovskite has triggered appealing interest in various solar energy-related applications including solar devices and photocatalysis. Nevertheless, further development of the perovskite materials is restricted due to their low redox capacity of the energy band, which is determined by the intrinsic electronic structure. Herein, we demonstrate surface defect-induced electronic structures of the Cs 2 AgBiBr 6 for achieving efficient photocatalytic performance by simply controlling the nucleation and growth processes of the lead-free double-perovskite. During the synthesis process, the strong interaction between the chelating agent EDTA and Cs + ion leads to the generation of Cs vacancies of Cs 2 AgBiBr 6 , which promotes the formation of surface defects to control the electronic structure of double perovskite. The optimized Cs 2 AgBiBr 6 has the strongest reduction capacity with the conduction band potential of −1.53 V (vs NHE at pH = 7) so far, which can greatly promote the production of superoxide radicals ( O 2 – ), improving the photocatalytic efficiency of the Cs 2 AgBiBr 6 . Under one simulated sunlight irradiation, the photodegradation efficiency of tetracycline (TC) for the as-obtained Cs 2 AgBiBr 6 with surface defect is up to 81.8 % within 90 min. Environmental Implication Environmental pollution resulting from various factitious and industrial activities is primarily composed of organic compounds such as pesticides, dyes, antibiotic and so on. Antibiotic, difficult to decompose, can only be decomposed slowly by chemical or biological methods owing to their strong stability. Photocatalysis is emerging as a promising technology for environmental remediation because of its strong oxidation ability and fast reaction rate. The eco-friendly Cs 2 AgBiBr 6 perovskite with a suitable bandgap (1.83 eV ∼ 2.19 eV) has recently emerged as a promising photocatalyst for application in pollutant degradation.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
Science China-Materials
·
2024
·
IF 6.8
Liu Hongjie,Sun Xue,Liu Jiaxin,Li Xiang,Hua Yunqiu,Yue Zhongjie,Song Jian,Wang Xilong,Yang Yujie,Lin Qianqian,Zhai Zhongjun,Tao Xutang,Zhang Guodong
Lead-halide perovskite single crystal (SC) heterojunctions have attracted significant attention for X-ray detection owing to their unique combination of high sensitivity, resolution, stability and low detection limit. However, the toxicity of lead in those perovskite heterojunctions limits their practical applications. Herein, we report the construction of the first all-inorganic lead-free Cs 2 AgBiBr 6 /Cs 3 Bi 2 Br 9 SC heterojunctions with an area of 20 × 20 mm 2 via a facile liquid-phase epitaxial method through temperature-lowering crystallization. The epitaxial crystallization of the three-dimensional (3D) Cs 2 AgBiBr 6 SC film on a 2D Cs 3 Bi 2 Br 9 SC substrate requires a large driving force for transitioning from the Volmer–Weber mode to the layer-by-layer growth mode under a rapid cooling rate. The Cs 2 AgBiBr 6 /Cs 3 Bi 2 Br 9 SC heterojunction detector achieves a high sensitivity of 1390 µC Gy air −1 cm −2 for 100 keV hard X-ray detection at room temperature, which is enhanced to 2075 µC Gy air −1 cm −2 at 75°C, demonstrating impressive high-temperature stability. Moreover, the detector achieves a detection limit of 37.48 nGy air s −1 and excellent stability for 90 days without any encapsulation. This work demonstrates the feasibility of using the epitaxial mechanism of perovskite formation on a high-surface-energy substrate for the controllable construction of a 3D/2D heterojunction that significantly enhances X-ray detection performance.
研究领域:
材料科学
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物理学
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电子工程
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DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Lihong Qi,Song Wang,Hongyan Li,Ruiji Sun,Yi Wu,Ruirui Wang,Liangying Hua,Ying Xie,Kai Pan
Lead-free double perovskite nanocrystals (NCs) have garnered significant attention due to their ability to address the toxicity and instability issues associated with lead-based perovskite NCs. Herein, we have successfully synthesized a series of Cs2AgBiBr6 NCs with varying concentrations of In3+ alloying, achieved through a colloidal solution method. These NCs consistently exhibit a monodisperse, uniform cubic morphology. By meticulously adjusting the alloying concentration of In3+, we have significantly enhanced the luminescence performance of Cs2AgBiBr6 NCs, achieving a maximum photoluminescence quantum yield of 14.69% at the optimal In3+ alloying concentration. Simultaneously, the exciton lifetime was markedly extended 4.6 times, greatly enhancing carrier dynamics. Temperature-dependent photoluminescence spectroscopy analysis further confirms that postalloying with In3+, the NCs not only exhibit strong Coulombic forces and high thermal stability but also significantly reduce nonradiative transition processes. Moreover, density functional theory calculations reveal that In3+ alloying leads to a redistribution of charge density, profoundly affecting the electronic structure and subsequently enhancing the carrier mobility. Therefore, this study not only provides valuable insights into the role of In3+ alloying in enhancing the luminescence performance of double perovskite NCs but also opens up potential application prospects for optoelectronic devices in the future.
研究领域:
材料科学
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光学
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物理化学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Xinlei Zhang,Bin-Bin Zhang,Xiao Ma,Maosen Fu,Gangqiang Zha,Wanqi Jie
Irradiation damage in halide perovskites usually enhances ion migration, decomposition, formation of intermediate phases, etc., which further decrease the working stability of halide perovskite optoelectronic devices. For example, due to the beam-sensitive nature of halide perovskites, the artifact information about local structures and microstructures is difficult to avoid during transmission electron microscopy (TEM) characterization. The interaction mechanism between high-energy electron beams and halide perovskites is still unclear. In this work, the electron-beam irradiation effect on solution-grown halide double perovskite Cs2AgBiBr6 crystals was systematically investigated by TEM. Depending on the different orientations of Cs2AgBiBr6, two kinds of electron beam irradiation damage were observed. When the irradiation on Cs2AgBiBr6 is along the [110]pc zone axis, a new phase Cs2Ag0.5BiBr6 with a vacancy-ordered superstructure forms, which is attributed to the “knock-on displacement” mechanism. In contrast, when the electron beams are along the [111]pc zone axis of Cs2AgBiBr6, an amorphous phase is gradually generated due to the “radiolysis” mechanism. Our finding clearly reveals the characteristics of irradiation damage in representative halide perovskites and further provides a new understanding of the working instability of halide perovskite optoelectronic devices.
研究领域:
材料科学
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物理化学
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DOI
高影响因子
NANOTECHNOLOGY
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2024
·Vol. 35
·期 19
·195708
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IF 2.9
Xiaofang Zhang,Ke Wang,Zhenyu Li,Juanjuan Qi,Dongke Li,Jianqiang Luo,Jian Liu
Recently, the lead-free double perovskite Cs2AgBiBr6 has been considered as a promising candidate for next-generation nonvolatile memory and artificial synapse devices due to its high stability and low toxicity compared to its lead-based counterparts. In this work, we developed a simple and effective method to produce high-quality lead-free double perovskite Cs2AgBiBr6 thin films without pinholes and particles by applying a low-pressure assisted method under ambient condition with a relative humidity (RH) of about 45%. The formation of pinholes and Ag precipitation in the perovskite Cs2AgBiBr6 films is effectively suppressed by the proper ratio of N,N-dimenthylformamide (DMF) mixed in dimethyl sulfoxide (DMSO) solvents. Furthermore, the grain size of the Cs2AgBiBr6 films can be significantly increased by increasing the post-annealing temperature. Finally, a sandwiched structure memristor with an ITO/Cs2AgBiBr6/Ta configuration was successfully demonstrated, featuring ultralow operation voltage (VSet ∼ 57 ± 23 mV, VReset ∼ −692 ± 68 mV) and satisfactory memory window (the ratio of RHRS/RLRS ∼ 10 times), which makes it suitable for low-power consumption information storage devices.
研究领域:
材料科学
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电子器件
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纳米技术
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yingying Wang,Hanlin Huang,Zhenzhen Zhang,Cong Wang,Yuying Yang,Qi Li,Dongsheng Xu
Solar-energy-driven CO 2 conversion into value-added chemical fuels holds great potential renewable energy generation. However, most of the photocatalysts facilitate a two-electron reduction process producing CO, hard for the eight-electron CH 4 production pathways which can stockpile more solar energy for further utilization. Herein, we developed an in situ assembly strategy to fabricate the lead-free perovskite Cs 2 AgBiBr 6 @g-C 3 N 4 Z-scheme system in toluene and the Cs 2 AgBiBr 6 @g-C 3 N 4 type-II heterojunction structure in CH 2 Cl 2 . By combining the reducing ability of the conduction band of g-C 3 N 4 and the oxidizing ability of the valence band of Cs 2 AgBiBr 6 perovskite, this Z-scheme system exhibits superior CH 4 production in photocatalytic CO 2 reduction, in contrast to the high CO selectivity for the heterojunction photocatalysts, which is 10-fold and 16-fold higher than that of pure g-C 3 N 4 and pure CABB, respectively. The stability (four consecutive photocatalytic cycles in solvent methanol as sacrificial reagent without obvious decrease of efficiency) and the mechanism (the prominent activity and the high CH 4 production selectivity boosted by Z-scheme system) were demonstrated. In this work, the first report for constructing lead-free halide perovskite Z-scheme and type-II photocatalytic systems for the regulation products selectivity of CO 2 reduction reaction provides a promising strategy for the fabrication other types of inorganic/organic heterojunction systems.
研究领域:
材料科学
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环境科学
·
光催化
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Guobiao Cen,Haigang Sheng,Zhengxuan Wang,Ling Yi,Hengchao Sun,Yipeng An,Chuanxi Zhao,Wenjie Mai
Bismuth-based double perovskite Cs 2 AgBiBr 6 shows promise as a photodetection material. However, its detection performance and application are limited by high-exciton binding energy and poor carrier mobility. In this study, we address these limitations by delicately designing a solution-based method for incorporating A-site Rubidium (Rb) substitution into Cs 2 AgBiBr 6 double perovskite films. The introduction of Rb resulted in a significant decrease in trap defect density and an improvement in film quality. The trap-filled limit voltage (V TFL ) of pure and Rb-doped CABB film is determined to be 1.71 V and 0.48 V, respectively. Subsequently, by introducing an ultrathin atomic-layer-deposited (ALD) TiO 2 films, the fabricated CABB photodetectors exhibit significantly improved photoresponse performance. The response speed and −3dB bandwidth are boosted from ∼93 ms to ∼350 μs and broadened from 1.4 kHz to 17 kHz, respectively. Density Functional Theory (DFT) calculations indicate Rb-substitution shortens the bond length and weaken exciton binding energy. Furthermore, we demonstrate a wireless near ultraviolet (UV) light communication system using CABB photodetectors as light receivers. Our findings provide an efficient approach to utilize A-site cation substitution as a tuning parameter for photodetection in high-exciton binding energy perovskite materials, thereby extending the potential applications of other functional perovskites .
研究领域:
材料科学
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光子学
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半导体物理
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Beili Pang,Weizhong Cui,Yiheng Li,Jianguang Feng,Hongzhou Dong,Liyan Yu,Lifeng Dong
The non-toxic perovskite Cs 2 AgBiBr 6 presents impressive photovoltaic performance and stability, offering a lead halide-free alternative for solar cells. Overcoming challenges related to thin-film preparation and its intrinsic indirect bandgap, we leverage the synergistic effect of co-doping with lithium ions (Li + ) and sodium ions (Na + ) to enhance perovskite solar cells (PSCs). Improved carrier transport in Cs 2 AgBiBr 6 films, facilitated by the diffusion of Li + , significantly enhances the photovoltaic conversion efficiency (PCE). Systematic exploration of various doping ratios identifies the optimal co-doping ratio, resulting in a remarkable PCE increase to 5.02 % and a short-circuit current of 6.56 mA cm −2 . Ion doping not only tunes the material's band gap but also adjusts the energy level arrangement within the device layers. Impressively, the PCE of co-doped PSCs experiences only a 16.8 % decline after 60 days in an unencapsulated environment, underscoring its outstanding stability. This work provides a rational design for double-ion co-doping experiments, enhancing PSC performance and offering valuable insights for the future development of PSCs.
研究领域:
材料科学
·
太阳能
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光伏技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）