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Zhang C, Wang Z, Da Z, Shi J, Wang J, Xu Y, Gaponenko NV, Bhatti AS, Wang M. One-Step Preparation of High-Stability CsPbX 3/CsPb 2X 5 Composite Microplates with Tunable Emission. ACS Appl Mater Interfaces 2024. [PMID: 38598608 DOI: 10.1021/acsami.4c00178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
The core-shell structure is an effective means to improve the stability and optoelectronic properties of cesium lead halide (CsPbX3 (X = Cl, Br, I)) perovskite quantum dots (QDs). However, confined by the ionic radius differences, developing a core-shell packaging strategy suitable for the entire CsPbX3 system remains a challenge. In this study, we introduce an optimized hot-injection method for the epitaxial growth of the CsPb2X5 substrate on CsPbX3 surfaces, achieved by precisely controlling the reaction time and the ratio of lead halide precursors. The synthesized CsPbX3/CsPb2X5 composite microplates exhibit an emission light spectrum that covers the entire visible range. Crystallographic analyses and density functional theory (DFT) calculations reveal a minimal lattice mismatch between the (002) plane of CsPb2X5 and the (11 ¯ 0) plane of CsPbX3, facilitating the formation of high-quality type-I heterojunctions. Furthermore, introducing Cl- and I- significantly alters the surface energy of CsPb2X5's (110) plane, leading to an evolutionary morphological shift of grains from circular to square microplates. Benefiting from the passivation of CsPb2X5, the composites exhibit enhanced optical properties and stability. Subsequently, the white light-emitting diode prepared using the CsPbX3/CsPb2X5 composite microplates has a high luminescence efficiency of 136.76 lm/W and the PL intensity decays by only 3.6% after 24 h of continuous operation.
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Affiliation(s)
- Chen Zhang
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education International Center for Dielectric Research & Shannxi Engineering Research Center of Advanced Energy Materials and Devices, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Zeyu Wang
- Frontier Institute of Science and Technology (FIST), Xi'an Jiaotong University, Xi'an, Shaanxi 710049 China
| | - Zheyuan Da
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education International Center for Dielectric Research & Shannxi Engineering Research Center of Advanced Energy Materials and Devices, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Jindou Shi
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education International Center for Dielectric Research & Shannxi Engineering Research Center of Advanced Energy Materials and Devices, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Junnan Wang
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education International Center for Dielectric Research & Shannxi Engineering Research Center of Advanced Energy Materials and Devices, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Youlong Xu
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education International Center for Dielectric Research & Shannxi Engineering Research Center of Advanced Energy Materials and Devices, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Nikolai V Gaponenko
- Belarusian State University of Informatics and Radioelectronics, P. Browki 6, Minsk 220013, Belarus
| | - Arshad Saleem Bhatti
- Centre for Micro and Nano Devices, Department of Physics, COMSATS Institute of Information Technology, Islamabad, 44500 Pakistan
- Virtual University of Pakistan, 5 Atta Turk Avenue, Sector G-5/1, Islamabad 44000, Pakistan
| | - Minqiang Wang
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education International Center for Dielectric Research & Shannxi Engineering Research Center of Advanced Energy Materials and Devices, Xi'an Jiaotong University, Xi'an, 710049, China
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Wang Y, Xu X, Yang W, Wei Y, Wang J. Encapsulation of CsPb 2Br 5 in TiO 2 Microcrystals to Enhance Environmental Stability. Micromachines (Basel) 2023; 14:2186. [PMID: 38138354 PMCID: PMC10745879 DOI: 10.3390/mi14122186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/28/2023] [Accepted: 11/28/2023] [Indexed: 12/24/2023]
Abstract
All-inorganic lead halide perovskite has emerged as an attractive semiconducting material due to its unique optoelectronic properties. However, its poor environmental stability restricts its broad application. Here, a simple method for the fabrication of CsPb2Br5/TiO2 is investigated. The introduction of p-aminobenzoic acid, which has two functional groups, is critical for the capping of amorphous TiO2 on CsPb2Br5. After calcination at 300 °C, amorphous TiO2 crystallizes into the anatase phase. The CsPb2Br5/TiO2 NCs show high long-term stability in water and enhanced stability against ultraviolet radiation and heat treatment, owing to the chemical stability of TiO2. More importantly, photo-electrochemical characterizations indicate that the formation of TiO2 shells can increase the charge separation efficiency. Hence, CsPb2Br5/TiO2 exhibits improved photoelectric activity owing to the electrical conductivity of the TiO2 in water. This study provides a new route for the fabrication of optoelectronic devices and photocatalysts based on perovskite NCs in the aqueous phase. Furthermore, the present results demonstrate that CsPb2Br5/TiO2 NCs has considerable potential to be used as a photoelectric material in optical sensing and monitoring.
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Affiliation(s)
- Yuezhu Wang
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian 116026, China; (Y.W.); (J.W.)
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Xiaotong Xu
- Key Laboratory of Coastal Ecology and Environment of State Oceanic Administration, National Marine Environmental Monitoring Center, Dalian 116023, China; (W.Y.); (Y.W.)
- Key Laboratory of Industrial Ecology and Environmental Engineering, Dalian University of Technology, Dalian 116024, China
| | - Wenchao Yang
- Key Laboratory of Coastal Ecology and Environment of State Oceanic Administration, National Marine Environmental Monitoring Center, Dalian 116023, China; (W.Y.); (Y.W.)
| | - Yawen Wei
- Key Laboratory of Coastal Ecology and Environment of State Oceanic Administration, National Marine Environmental Monitoring Center, Dalian 116023, China; (W.Y.); (Y.W.)
| | - Junsheng Wang
- Liaoning Key Laboratory of Marine Sensing and Intelligent Detection, Dalian Maritime University, Dalian 116026, China; (Y.W.); (J.W.)
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Dong H, Kareem S, Gong X, Ruan J, Gao P, Zhou X, Liu X, Zhao X, Xie Y. Water-Triggered Transformation of Ligand-Free Lead Halide Perovskite Nanocrystal-Embedded Pb(OH)Br with Ultrahigh Stability. ACS Appl Mater Interfaces 2021; 13:23960-23969. [PMID: 33974393 DOI: 10.1021/acsami.1c06627] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Lead halide perovskite (LHP) nanomaterials have attracted tremendous attention owing to their remarkable optoelectronic properties. However, they are extremely unstable under moist environments, high temperatures, and light illumination due to their intrinsic structural lability, which has been the critical unsolved problem for practical applications. To address this issue, we propose a facile and environmentally friendly ligand-free approach to design and synthesize rod-like CsPb2Br5-embedded Pb(OH)Br with excellent stability under various harsh environments such as soaking in water, heating, and ultraviolet (UV) illumination. Plate-like CsPbBr3- and Cs4PbBr6-embedded Pb(OH)Br powders are first formed by evaporating the solvent in a dispersion of ethanol (or methanol, isopropanol), Cs2CO3, and PbBr2. Upon soaking in water, the plate-like sample undergoes phase transformation from CsPbBr3 and Cs4PbBr6 to CsPb2Br5 and shape conversion from nanoplate to a microrod, leading to the formation of rod-like CsPb2Br5-embedded Pb(OH)Br. The stable Pb(OH)Br coating effectively prevents the luminescent CsPb2Br5 nanocrystals from reacting with water, leading to extremely high aqueous stability of the CsPb2Br5-embedded Pb(OH)Br. The photoluminescence (PL) intensity of the representative CsPb2Br5-embedded Pb(OH)Br sample can maintain 92.2% of the initial PL intensity value even after soaking in room-temperature water for 165 days; in the meantime, the phase and shape are preserved. The typical sample also shows outstanding stability under hot water, UV illumination, and annealing conditions. The ultrahigh aqueous stability, thermal stability, and photostability of the CsPb2Br5-embedded Pb(OH)Br nanomaterials suggest an effective, facile, and environmentally friendly technique to grow perovskite-based nanomaterials for promising practical applications in the optoelectronic field.
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Affiliation(s)
- Hao Dong
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, P. R. China
| | - Shefiu Kareem
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, P. R. China
| | - Xiao Gong
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, P. R. China
| | - Jian Ruan
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, P. R. China
| | - Peng Gao
- Laboratory of Advanced Functional Materials, Xiamen Institute of Rare-earth Materials, Chinese Academy of Science, No 1300 Jimei Road, Jimei District, 361021 Xiamen, Fujian, P. R. China
| | - Xuedong Zhou
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, P. R. China
| | - Xiaoqing Liu
- Center for Materials Research & Testing, Wuhan University of Technology, Wuhan, Hubei 430070, P. R. China
| | - Xiujian Zhao
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, P. R. China
| | - Yi Xie
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, P. R. China
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Wang R, Li Z, Li S, Wang P, Xiu J, Wei G, Liu H, Jiang N, Liu Y, Zhong M. All-Inorganic Perovskite CsPb 2Br 5 Nanosheets for Photodetector Application Based on Rapid Growth in Aqueous Phase. ACS Appl Mater Interfaces 2020; 12:41919-41931. [PMID: 32829630 DOI: 10.1021/acsami.0c05754] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
All-inorganic cesium lead-halide perovskites exhibit a great development prospect in optoelectronic devices owing to their stability and remarkable optoelectronic properties. Herein, we investigate the solution-processed synthesis of perovskite CsPb2Br5 nanosheets by using aqueous and ethanol as solvents. The results show that the aqueous environment ensures the phase formation of CsPb2Br5 and that the supersaturated solution in ethanol boosts nucleation of the nanosheets. The substrate temperature is the key factor for the evolution of morphology and the variation of the thickness of CsPb2Br5 nanosheets. Lower substrate temperature (<35 °C) is conducive to the formation of evenly distributed nanosheets with less stacking. The spatial and time-resolved fluorescence spectra indicate the heterogeneity of the defect density and the recombination process in different nanosheet regions. The photodetector based on the prepared CsPb2Br5 nanosheet displays an excellent switching current ratio (9 × 102), a short rise and decay time (43 and 83 ms, respectively), and good stability (75% of the initial current after 90 days in air). In addition, the mechanical stability and flexibility of the photodetector on the flexible substrate are investigated for 500 bending cycles.
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Affiliation(s)
- Rendong Wang
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
| | - Zhao Li
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
| | - Shutao Li
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
| | - Pengfei Wang
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
| | - Junshan Xiu
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
| | - Gongxiang Wei
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
| | - Huiqiang Liu
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
| | - Ning Jiang
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
| | - Yunyan Liu
- School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
| | - Mianzeng Zhong
- Hunan Key Laboratory of Super-Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha, Hunan 410083, China
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Jung J, Kim SH, Park Y, Lee D, Lee J. Metal-Halide Perovskite Design for Next-Generation Memories: First-Principles Screening and Experimental Verification. Adv Sci (Weinh) 2020; 7:2001367. [PMID: 32832372 PMCID: PMC7435252 DOI: 10.1002/advs.202001367] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Indexed: 06/11/2023]
Abstract
Memory devices have been advanced so much, but still it is highly required to find stable and reliable materials with low-power consumption. Halide perovskites (HPs) have been recently adopted for memory application since they have advantages of fast switching based on ionic motion in crystal structure. However, HPs also suffer from poor stability, so it is necessary to improve the stability of HPs. In this regard, combined first-principles screening and experimental verification are performed to design HPs that have high environmental stability and low-operating voltage for memory devices. First-principles screening identifies 2D layered AB2X5 structure as the best candidate switching layer for memory devices, because it has lower formation energy and defect formation energy than 3D ABX3 or other layered structures (A3B2X7, A2BX4). To verify results, all-inorganic 2D layered CsPb2Br5 is synthesized and used in memory devices. The memory devices that use CsPb2Br5 show much better stability and lower operating voltages than devices that use CsPbBr3. These findings are expected to provide new opportunity to design materials for reliable device applications based on calculation, screening, and experimental verification.
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Affiliation(s)
- Ju‐Hyun Jung
- Department of Materials Science and EngineeringPohang University of Science and Technology (POSTECH)Pohang37673Korea
| | - Seong Hun Kim
- Department of Materials Science and EngineeringPohang University of Science and Technology (POSTECH)Pohang37673Korea
| | - Youngjun Park
- Department of Materials Science and EngineeringPohang University of Science and Technology (POSTECH)Pohang37673Korea
| | - Donghwa Lee
- Department of Materials Science and EngineeringPohang University of Science and Technology (POSTECH)Pohang37673Korea
- Division of Advanced Materials SciencePohang University of Science and Technology (POSTECH)Pohang37673Korea
| | - Jang‐Sik Lee
- Department of Materials Science and EngineeringPohang University of Science and Technology (POSTECH)Pohang37673Korea
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Yun R, Luo L, He J, Wang J, Li X, Zhao W, Nie Z, Lin Z. Mixed-Solvent Polarity-Assisted Phase Transition of Cesium Lead Halide Perovskite Nanocrystals with Improved Stability at Room Temperature. Nanomaterials (Basel) 2019; 9:E1537. [PMID: 31671551 DOI: 10.3390/nano9111537] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 10/10/2019] [Accepted: 10/28/2019] [Indexed: 01/28/2023]
Abstract
Cesium lead halide perovskite nanocrystals (NCs) have attracted enormous interest in light-emitting diode, photodetector and low-threshold lasing application in terms of their unique optical and electrical performance. However, little attention has been paid to other structures associated with CsPbBr3, such as CsPb2Br5. Herein, we realize a facile method to prepare dual-phase NCs with improved stability against polar solvents by replacing conventional oleylamine with cetyltrimethyl ammonium bromide (CTAB) in the reprecipitation process. The growth of NCs can be regulated with different ratios of toluene and ethanol depending on solvent polarity, which not only obtains NCs with different sizes and morphologies, but also controls phase transition between orthorhombic CsPbBr3 and tetragonal CsPb2Br5. The photoluminescence (PL) and defect density calculated exhibit considerable solvent polarity dependence, which is ascribed to solvent polarity affecting the ability of CTAB to passivate surface defects and improve stoichiometry in the system. This new synthetic method of perovskite material will be helpful for further studies in the field of lighting and detectors.
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Li J, Zhang H, Wang S, Long D, Li M, Wang D, Zhang T. Inter-Conversion between Different Compounds of Ternary Cs-Pb-Br System. Materials (Basel) 2018; 11:E717. [PMID: 29724066 DOI: 10.3390/ma11050717] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Revised: 04/18/2018] [Accepted: 05/01/2018] [Indexed: 12/20/2022]
Abstract
The perovskite CsPbBr3 attracts great attention due to its potential in optoelectronics. However, stability remains a major obstacle to achieving its effecting application. In this work, we prepared CsPbBr3 solids through a simple reaction and investigated reversible conversion between CsPbBr3, Cs4PbBr6, and CsPb2Br5. We found that CsPbBr3 can be respectively converted to Cs4PbBr6 or CsPb2Br5 by reacting with CsBr or PbBr2. Thermodynamic analysis demonstrated that the chemical reactions above were exothermic and occurred spontaneously. Moreover, the formed Cs4PbBr6 could be converted to CsPbBr3 reversely, and then progressively converted to Cs-deficient CsPb2Br5 by extraction of CsBr with water. The CsPb2Br5 was converted to CsPbBr3 reversely under thermal annealing at 400 °C. The thermodynamic processes of these conversions between the three compounds above were clarified. Our findings regarding the conversions not only provide a new method for controlled synthesis of the ternary Cs-Pb-Br materials but also clarify the underlying mechanism for the instability of perovskites CsPbBr3.
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