Small
·
2024
·
IF 13
Manman Yang,Xiaoling Wu,Anfeng Li,Xia Hao,Lili Wu,Haibo Tian,Dingyu Yang,Jingquan Zhang
The Cs 3 Bi 2 I 9 single crystal, as an all-inorganic non-lead perovskite, offers advantages such as stability and environmental friendliness. Its superior photoelectric properties, attributed to the absence of grain boundary influence, make it an outstanding X-ray detection material compared to polycrystals. In addition to material properties, X-ray detector performance is affected by the thickness of the absorption layer. Addressing this, a space-confined method is proposed. The temperature field is determined through finite element simulation, effectively guiding the design of the space-confined method. Through this innovative method, a series of thickness-controlled perovskite single crystal wafers (PSCWs) are successfully prepared. Corresponding X-ray detectors are then prepared, and the impact of single crystal thickness on device performance is investigated. With an increase in single crystal thickness, a rise followed by a decline in device sensitivity is observed, reaching an optimal value at 0.7 mm thickness at 40V mm −1 with a device performance of 11313.6µC Gy −1 cm −2 . This space-confined method enables the direct growth of high-quality perovskite single crystals with specified thickness, eliminating the need for slicing or etching.
研究领域:
材料科学
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物理学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yue Tian,Ying Li,Chuqiao Hu,Yaqian Yang,Di Chen,Guozhen Shen
Weak-light detection technology is widely used in various fields, including industry, high-energy physics, precision analysis, and reflection imaging. Metal–semiconductor–metal (MSM) photodetectors demonstrate high detectivity and high response speed and are one of the suitable structures for the preparation of weak-light detectors. However, traditional MSM photodetectors tend to exhibit high dark currents, which are not conducive to performance improvement. Here, a MXene–Cs3Bi2I9–MXene weak-light detector is proposed. Based on the MXene–Cs3Bi2I9 Schottky junctions, the dark current is reduced by 2 orders of magnitude and the responsivity is significantly improved compared with the traditional Cr/Au–Cs3Bi2I9–Cr/Au MSM photodetector. The device demonstrates excellent photodetection capacity with a photoresponsivity of 6.45 A W–1, a specific detectivity of 9.45 × 1011 Jones, and a fast response speed of 0.27/2.32 ms. Especially, the device yielded a superior weak-light detectable limit of 10.66 nW cm–2 and demonstrated excellent optical communication capability. Moreover, such a flexible device shows little degradation in photodetection performance after extreme bending for 4500 cycles, proving remarkable bending endurance and flexibility. The obtained results highlight the great potential of such Cs3Bi2I9/MXene devices as a stable and environmentally friendly candidate for weak-light detection.
研究领域:
材料科学
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光电检测
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Anfeng Li,Manman Yang,Peng Tang,Xia Hao,Lili Wu,Wenbo Tian,Dingyu Yang,Jingquan Zhang
Cs3Bi2I9 (CBI) single crystal (SC) is a promising material for a higher-performance direct X-ray detector. However, the composition of CBI SC prepared by the solution method usually deviates from the ideal stoichiometric ratio, which limits the detector performance. In this paper, based on the finite element analysis method, the growth model of the top-seed solution method has been established, and then the influence of precursor ratio, temperature field, and other parameters on the composition of CBI SC has been simulated. The simulation results were used to guide the growth of the CBI SCs. Finally, a high-quality CBI SC with a stoichiometric ratio of Cs/Bi/I = 2.87:2:8.95 has been successfully grown, and the defect density is as low as 1.03 × 109 cm–3, the carrier lifetime is as high as 16.7 ns, and the resistivity is as high as 1.44 × 1012 Ω·cm. The X-ray detector based on this SC has a sensitivity of 29386.2 μC·Gyair–1 cm–2 at an electric field of 40 V·mm–1, and a low detection limit of 0.36 nGyair·s–1, creating a record for the all-inorganic perovskite materials.
研究领域:
材料科学
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物理学
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DOI
PubMed
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-11
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IF 12.121
Zhang Yunxia,Liu Yucheng,Xu Zhuo,Ye Haochen,Yang Zhou,You Jiaxue,Liu Ming,He Yihui,Kanatzidis Mercouri G.,Liu Shengzhong (Frank)
The organic-inorganic hybrid lead halide perovskites have emerged as a series of star materials for solar cells, lasers and detectors. However, the issues raised by the toxic lead element and marginal stability due to the volatile organic components have severely limited their potential applications. In this work, we develop a nucleation-controlled solution method to grow large size high-quality Cs 3 Bi 2 I 9 perovskite single crystals (PSCs). Using the technique, we harvest some centimeter-sized single crystals and achieved high device performance. We find that X-ray detectors based on PSCs exhibit high sensitivity of 1652.3 μC Gy air −1 cm −2 and very low detectable dose rate of 130 nGy air s −1 , both desired in medical diagnostics. In addition, its outstanding thermal stability inspires us to develop a high temperature X-ray detector with stable response at up to 100 °C. Furthermore, PSCs exhibit high X-ray imaging capability thanks to its negligible signal drifting and extremely high stability.
研究领域:
材料科学
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医学成像
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辐射探测
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
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2022
·Vol. 10
·期 17
·6665-6672
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IF 8.067
Nuo Bu,Shanshan Jia,Yingrui Xiao,Haojin Li,Nan Li,Xinmei Liu,Zhou Yang,Kui Zhao,Shengzhong (Frank) Liu
Lead-free perovskites are promising for next-generation bio-friendly X-ray detector materials, while it remains a challenge to fabricate high-quality wafers at a macroscopic scale using a readily scalable method. Herein, a solvent-free mechanochemical fabrication method is developed to produce inch-size lead-free perovskite Cs3Bi2I9 crystalline-wafers. It is surprising to see that these polycrystalline wafers exhibit near-intrinsic properties, and more specifically, the apparent trap density is measured to be as low as 5.26 × 10−10 cm−3, essentially the same as that of their single-crystal counterparts. Therefore, the X-ray detector fabricated on the Cs3Bi2I9 wafer delivers high sensitivity up to 230.46 ± 19.86 μC Gyair−1 cm−2 and a detection limit as low as 61.25 nGyair s−1 under a 40 kV X-ray source and 40 V mm−1 electric field. This research provides a readily scalable method for fabricating large perovskite wafers with near-intrinsic properties for general commercial applications.
研究领域:
材料科学
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辐射探测技术
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DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 15
·2203066
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IF 9
Manman Yang,Anfeng Li,Xia Hao,LiLi Wu,Wenbo Tian,Dingyu Yang,Jingquan Zhang
Direct X-ray detectors require high-quality and large-size materials to reduce radiation hazards. As an all-inorganic lead-free perovskite, Cs 3 Bi 2 I 9 has good prospects for research and applications in the field of X-ray detection. A refined evaporation method is proposed for the growth of Cs 3 Bi 2 I 9 single crystals (SCs), and a high-quality SC with a size of 18 × 20.5 × 3 mm 3 is obtained. Due to the anisotropy of Cs 3 Bi 2 I 9 SCs, two different device structures, vertical and coplanar, are designed. The coplanar device has a higher sensitivity of 59 464.4 µC Gy air −1 cm −2 , while the vertical device performs better on the limit of detection (LoD), with an LodD as low as 1.27 nGy air s −1 .
研究领域:
材料科学
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辐射探测技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yating Zhu,Fan Wang,Jiayin Wang,Kaijia Xu,Yinyin Qian
The negative photoconductivity (NPC) effect is becoming an increasingly significant factor in the development of next-generation optoelectronics. However, research in the field of NPC-dominated optoelectronics remains in its infancy and frequently encounters challenges related to fabrication complexity, slow photoresponse speed, instability, and a limited spectral response range. Herein, a Cs 3 Bi 2 I 9 /Au heterostructure nanocomposite was prepared via a simple self-assembly process utilizing electrostatic interactions with Au nanoparticles (NPs) and lead-free Cs 3 Bi 2 I 9 nanoplates. The Cs 3 Bi 2 I 9 /Au nanocomposite-based photodetectors (PDs) demonstrate a broadband photoresponse (405–1550 nm), enhanced rise/fall times (27.2/40.0 µs), and reduced noise density (4.7 × 10 −13 A/Hz 1/2 at 1 Hz). In contrast to the positive photoconductivity (PPC) effect observed in colloidally synthesized Cs 3 Bi 2 I 9 nanoplate-based PDs, the NPC can be attributed to the decrease in photocurrent under light illumination during the processes of recombination and trapping of photogenerated carriers induced by the incorporation of Au NPs. These findings are expected to provide valuable insights into achieving high-performance NPC-dominated PDs by regulating the dynamics of photogenerated carriers in perovskite heterostructures.
研究领域:
材料科学
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光电子学
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纳米技术
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Xinyu Duan,Huiping Jia,Tingting Cao,Hongbin Yu,Yanan Zhang,Ying Lu,Dandan Zhou
Nitrate, widely present in water, can be excited by UV light and generate reactive nitrogen species (RNS) etc., facilitating pollutants selective degradation. In this work, the promoting effect of nitrate on atrazine removal in the Z-scheme Cs 3 Bi 2 I 9 /BiVO 4 (CBI/BVO) photocatalytic system was studied. The CBI/BVO composite utilized CBI and BVO excitation to enhance photogenerated carriers production, and the Z-scheme heterojunction to increase photoinduced carriers separation yield, with a maximum value of 15.41 times that of pure BVO, releasing CBI electrons and BVO holes with powerful redox ability. Thanks to nitrate addition, the atrazine degradation improved, whose kinetic constant was 14.46 and 2.37 times higher than that of nitrate photolysis and 0.32-CBI/BVO photocatalysis . DFT , HPLC-MS, EPR , and toxicity assessments indicated the electron rich portion of atrazine and its intermediates were susceptible to RNS attack and underwent dechlorination , that combined with the oxidation brought by ·OH, synergistically promoting atrazine degradation, mineralization, and detoxification.
研究领域:
环境科学
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光催化技术
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污染控制
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材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Fengyi Zhong,Chaowei Yuan,Ye He,Yanjuan Sun,Jianping Sheng,Fan Dong
Constructing heterostructure is an effective way to fabricate advanced photocatalysts. However, the catalytic performance of typical common multi-dimensional bulk heterostructure still suffers from the limited active interface and inefficient carrier migration. Herein, we successfully synthesize the SnO 2 /Cs 3 Bi 2 I 9 dual-quantum-dots nanoheterostructure (labeled as SCX, X = 1, 2, 3) for efficiently and stably photocatalytic NO removal under visible light irradiation. The NO removal rate of SC2 is almost 8 and 17 times higher than that of the single SnO 2 and Cs 3 Bi 2 I 9 , respectively. Moreover, the SC2 photocatalyst shows only 3 % attenuation after five consecutive cycles, demonstrating good photocatalytic stability. Systematic experimental characterization and theoretical density functional theory calculations revealed that the high activity and stability of SCX originated from the efficient charge transfer at the confined interface between SnO 2 and Cs 3 Bi 2 I 9 quantum dots . This work provides a new perspective for constructing innovative dual-quantum-dots nanoheterostructure and assesses their potential in photocatalytic environmental applications.
研究领域:
材料科学
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环境科学
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理论计算
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DOI
高影响因子
ACS Applied Optical Materials
·
2026
·
IF 3.4
Yubo Wan,Mengfan Liu,Guocheng Zhu,Hao Sun,Jiahao Yang,Zizhi Wang,Huiyun Wei,Huiyin Zhang
High crystallinity and low trap density are fundamental prerequisites for perovskite materials to achieve high performance in optoelectronic applications. Compared with their well-developed lead (Pb)-based counterparts, bismuth (Bi)-based perovskites exhibit inferior performance, primarily due to poor crystallization and high defect concentrations in polycrystalline films. The fabrication of smooth, compact Cs3Bi2I9 films with distinctly visible large-sized grains remains a significant challenge. Herein, we prepared high-quality Cs3Bi2I9 films with large grains by promoting ripening growth of small grains via a modified antisolvent strategy. The resulting Cs3Bi2I9 films exhibited enhanced crystallinity and absorption, along with reduced defect density and suppressed nonradiative recombination, which are conducive to the fabrication of high-performance photodetectors. Self-powered photodetectors assembled from these Cs3Bi2I9 films demonstrated an on/off ratio of up to 1.2 × 105, a responsivity (R) of 0.44 mA/W, and a specific detectivity (D*) of 4.12 × 1010 Jones under 1 sun illumination. This work paves the way for the preparation of high-quality Bibased perovskite films and highlights their potential in optoelectronic applications.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 21
·3751
·
IF 5.719
Shindume Lomboleni Hamukwaya,Huiying Hao,Melvin Mununuri Mashingaidze,Tingting Zhong,Shu Tang,Jingjing Dong,Jie Xing,Hao Liu
Lead-free, bismuth-based perovskite solar cells (PSCs) are promising, non-toxic, and stable alternatives to lead-based PSCs, which are environmentally harmful and highly unstable under deprived air conditions. However, bismuth-based PSCs still suffer from low-power-conversion efficiency (PCE) due to their large bandgap and poor film morphology. Their poor film-forming ability is the greatest obstacle to Cs₃Bi₂I₉ progress in thin-film solar cell technology. This study synthesizes novel, lead-free perovskites with a small bandgap, excellent stability, and highly improved photovoltaic performance by integrating different amounts of potassium iodide (KI) into a perovskite precursor solution. KI incorporation improves the crystallinity of the perovskite, increases the grain size, and decreases the potential contact distribution, which is demonstrated by X-ray diffraction, electronic scanning microscopy, atomic force microscopy, and ultraviolet-visible spectroscopy. The Cs₃Bi₂I₉ PSC device with 2 vol. % incorporation of KI shows the highest PCE of 2.81% and Voc of 1.01 V as far as all the Bi-based cells fabricated for this study are concerned. The study demonstrates that incorporating KI in the Cs₃Bi₂I₉ perovskite layer highly stabilizes the resultant PSC device against humidity to the extent that it maintains 98% of the initial PCE after 90 days, which is suitable for solar cell applications. The devices also demonstrate greater resistance to airborne contaminants and high temperatures without encapsulation, opening up new possibilities for lead-free Cs₃Bi₂I₉ PSCs in future commercialization.Keywords:Cs3Bi2I9perovskite solar cells;KI incorporation;crystallinity;morphology;cell stability
研究领域:
材料科学
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能源技术
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 12
·1909701
·
IF 16.836
Wen-Guang Li,Xu-Dong Wang,Jin-Feng Liao,Yong Jiang,Dai-Bin Kuang
Hybrid organic–inorganic lead halide perovskite single crystal thin film (SCTF) recently has attracted enormous interest in the field of optoelectronic devices, since it efficiently resolves the trade-off between thickness and carrier diffusion length. However, the toxicity of lead element and the instability induced by organic component still hinder its future developments. In this work, lead-free all-inorganic Cs 3 Bi 2 I 9 SCTF with a high orientation along (00h) has been in situ grown on indium tin oxide (ITO) glass via a space-limited solvent evaporation crystallization method. The trap density of Cs 3 Bi 2 I 9 SCTF (5.7 × 10 12 cm −3 ) is 263 folds lower than that of the polycrystalline thin film (PCTF) counterpart, together with a 5-order-of-magnitude higher carrier mobility. These superior charge transfer properties enable a photoresponse on–off ratio as high as 11 000, which far surpasses that of the PCTF device by 460 folds, comparable to the lead halide perovskite. Furthermore, the Cs 3 Bi 2 I 9 SCTF photodetector exhibits outstanding stability even without any encapsulation, whose initial performance is well maintained after aging 1000 h in humid air of 50% RH or continuous on–off light illumination for 20 h. This work will pave the way to produce new families of high-performance, stable, and nontoxic perovskite SCTF for future optoelectronic applications.
研究领域:
材料科学
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光电子学
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DOI
高影响因子
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