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Mireles Villegas N, Hernandez JC, John JC, Sheldon M. Promoting solution-phase superlattices of CsPbBr 3 nanocrystals. NANOSCALE 2023. [PMID: 37171143 DOI: 10.1039/d3nr00693j] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We present a size-selective method for purifying and isolating perovskite CsPbBr3 nanocrystals (NCs) that preserves their as-synthesized surface chemistry and extremely high photoluminescence quantum yields (PLQYs). The isolation procedure is based on the stepwise evaporation of nonpolar co-solvents with high vapor pressure to promote precipitation of a size-selected product. As the sample fractions become more uniform in size, we observe that the NCs self-assemble into colloidally stable, solution-phase superlattices (SLs). Small angle X-ray scattering (SAXS) and dynamic light scattering (DLS) studies show that the solution-phase SLs contain 1000s of NCs per supercrystal in a simple cubic, face-to-face packing arrangement. The SLs also display systematically faster radiative decay dynamics and improved PLQYs, as well as unique spectral absorption features likely resulting from inter-particle electronic coupling effects. This study is the first demonstration of solution-phase CsPbBr3 SLs and highlights their potential for achieving collective optoelectronic phenomena previously observed from solid-state assemblies.
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Affiliation(s)
| | - Josue C Hernandez
- Department of Chemistry, Texas A&M University, College Station, Texas 77842, USA.
| | - Joshua C John
- Department of Material Science and Engineering, Texas A&M University, College Station, Texas 77840, USA
| | - Matthew Sheldon
- Department of Chemistry, Texas A&M University, College Station, Texas 77842, USA.
- Department of Material Science and Engineering, Texas A&M University, College Station, Texas 77840, USA
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Guo SN, Wu H, Wang D, Wang JX. Cost-Effective Strategy for the Synthesis of Air-Stable CH 3NH 3PbX 3 (X = Cl, Br, and I) Quantum Dots with Bright Emission. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11520-11525. [PMID: 34555896 DOI: 10.1021/acs.langmuir.1c01773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Lead halide perovskite quantum dots (QDs) are known as prospective optoelectronic device materials because of their excellent luminescence, extraordinary photoelectric performance, and specific octahedron framework. Herein, we report a cost-effective approach for synthesizing highly stable CH3NH3PbBr3 QDs in low-polarity binary solvents without nitrogen protection. The CH3NH3PbBr3 QDs are tunable from 1.2 to 4.2 nm by adjusting the proportion of oleic acid and oleylamine as capping ligands. The photoluminescence quantum yield of CH3NH3PbBr3 QDs can reach 87.4%. The fluorescence can maintain over 80% of its earliest emission intensity under the atmosphere after 5 days, which is much better than that (∼10%) of QDs with ligand-assisted reprecipitation. The possible reaction mechanism of preparing CH3NH3PbBr3 QDs was also addressed. Notably, such a strategy can be applied extensively in the preparation of other lead halide perovskite QDs. Furthermore, the as-prepared thick PMMA-coated CH3NH3PbBr3 QDs were further conjoined with a red luminescence powder on a blue InGaN chip to obtain a powerful efficiency (45.4 lm W-1) warm white light-emitting diode.
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Affiliation(s)
- Sai-Nan Guo
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P.R. China
- Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
| | - Hao Wu
- Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
| | - Dan Wang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P.R. China
- Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
| | - Jie-Xin Wang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P.R. China
- Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, P.R. China
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Babu R, Bhandary S, Chopra D, Singh SP. Lead-Free, Water-Stable A 3 Bi 2 I 9 Perovskites: Crystal Growth and Blue-Emitting Quantum Dots [A=CH 3 NH 3 + , Cs + , and (Rb 0.05 Cs 2.95 ) + ]. Chemistry 2020; 26:10519-10527. [PMID: 32715548 DOI: 10.1002/chem.202000506] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 04/11/2020] [Indexed: 02/01/2023]
Abstract
Despite the great success in the increase in the power conversion efficiency of lead halide perovskite solar cells, the toxicity of lead and the unstable nature of the materials are still major concerns for their wider implementation at the industrial level. Herein, large-size single crystals (SCs) are developed in HI solution by using a temperature lowering method and nanocrystals (NCs) of A3 Bi2 I9 perovskites [where A=CH3 NH3 + (MA)+ , Cs+ , and (Rb0.05 Cs2.95 )+ ] are formed in ethanol (EtOH) and toluene (TOL). The stability of A3 Bi2 I9 perovskite is investigated by immersing the SCs for 24 h and pellets for 12 h in water. Moreover, the A3 Bi2 I9 perovskite NCs displays a promising photoluminescence quantum yield of 17.63 % and a long lifetime of 8.20 ns.
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Affiliation(s)
- Ramavath Babu
- Polymers and Functional Materials Division, CSIR-Indian Institute of Chemical Technology (IICT), Uppal Road, Tarnaka, Hyderabad, 500007, India
| | - Subhrajyoti Bhandary
- Department of Chemistry, Crystallography and Crystal Chemistry Laboratory, IISER, Bhopal, 462066, India
| | - Deepak Chopra
- Department of Chemistry, Crystallography and Crystal Chemistry Laboratory, IISER, Bhopal, 462066, India
| | - Surya Prakash Singh
- Polymers and Functional Materials Division, CSIR-Indian Institute of Chemical Technology (IICT), Uppal Road, Tarnaka, Hyderabad, 500007, India
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Liu Y, Wang Z, Liang S, Li Z, Zhang M, Li H, Lin Z. Polar Organic Solvent-Tolerant Perovskite Nanocrystals Permanently Ligated with Polymer Hairs via Star-like Molecular Bottlebrush Trilobe Nanoreactors. NANO LETTERS 2019; 19:9019-9028. [PMID: 31692361 DOI: 10.1021/acs.nanolett.9b04047] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The key to exploiting perovskite nanocrystals (NCs) for long-term practical use in optoelectronic materials and devices lies in the ability to access stable NCs. Herein, we report the crafting of hairy perovskite NCs with a set of markedly improved stabilities by capitalizing on rationally designed star-like molecular bottlebrush trilobes as nanoreactors. An intriguing star-like molecular bottlebrush trilobe, poly(2-hydroxyethyl methacrylate)-graft-(poly(acrylic acid)-block-partially cross-linked polystyrene (denoted PHEMA-g-(PAA-b-cPS)) is synthesized. Subsequently, it is employed as a polymeric nanoreactor to direct the growth of green-emitting all-inorganic perovskite CsPbBr3 NCs intimately and stably tethered by partially cross-linked PS "hairs" (i.e., cPS-capped CsPbBr3 NCs). The resulting CsPbBr3 NCs exhibit an array of impressive stabilities against UV irradiation, moisture, heat, and water, due to permanently ligated hydrophobic cPS "hairs" on the surface of CsPbBr3 NCs as a result of the original covalent bonding between PAA and cPS blocks. More importantly, cPS-capped CsPbBr3 NCs manifest outstanding stability in various polar organic solvents. Such greatly improved stability can be attributed to the reduced surface defects enabled by the favorable interaction (i.e., coordination interaction and hydrogen bonding) between CsPbBr3 NCs and polar solvents, which dominates over their dissolution by polar solvents. Such exceptional stabilities impart the use of cPS-capped CsPbBr3 NCs as a selective probe for tracing the presence of Cl-/I- in polar organic solvents. The amphiphilic nonlinear block copolymer nanoreactor strategy can afford easy access to stable perovskite NCs of interest with controlled compositions and surface chemistry. They may find applications in solar cells, LEDs, photodetectors, lasers, bioimaging, biosensors, etc.
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Affiliation(s)
- Yijiang Liu
- School of Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
- College of Chemistry and Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education , Xiangtan University , Xiangtan 411105 , Hunan Province , China
| | - Zewei Wang
- School of Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
| | - Shuang Liang
- School of Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
| | - Zili Li
- School of Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
| | - Mingyue Zhang
- School of Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
| | - Huaming Li
- College of Chemistry and Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education , Xiangtan University , Xiangtan 411105 , Hunan Province , China
| | - Zhiqun Lin
- School of Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
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Premkumar S, Kundu K, Umapathy S. Impact of cesium in methylammonium lead bromide perovskites: insights into the microstructures, stability and photophysical properties. NANOSCALE 2019; 11:10292-10305. [PMID: 31099377 DOI: 10.1039/c9nr02733e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The thermal and moisture instabilities of pure organic lead halide perovskites are the foremost concerns towards the commercialization of perovskite solar cells, which can be avoided by introducing an inorganic cation, such as cesium ion (Cs+) at the A-site of the perovskite crystals. In this report, the impacts of substituted Cs+ cations on the inherent properties such as microstructures, morphology, and photophysics of pure methylammonium lead bromide (MAPbBr3) perovskites have been investigated. Successful formation of mixed MA1-xCsxPbBr3 phases (with 0 ≤ x ≤ 1.0) was predicted from the theoretically calculated tolerance factor, which was further supported by the appearance of sharp diffraction peaks in X-ray diffraction (XRD) patterns without any additional peaks in the whole composition range. Substitution of Cs+ ions brings significant lattice contraction in the parent MAPbBr3 crystal due to the ion size disparity in the ionic radii between MA+ and Cs+ ions. We examine the vibrational signatures of the Raman bands related to the organic MA+ and infer the nature of interactions between the organic moiety and the surrounding inorganic cage as a function of Cs concentration. Raman spectroscopic analysis reveals structural distortion due to the altered H-bonding interaction of the N+-HBr- type between MA+ and the PbBr3- octahedral framework as a function of Cs content, which is responsible for the octahedral tilting in Cs substituted MAPbBr3. We also found hindered rotational motions of MA+ in the octahedral cage of mixed cationic systems, resulting in the orientational ordering of MA in the presence of Cs. These results certainly offer highly ordered mixed phase structures and promote superior thermal stability, as evident from the thermogravimetric analysis. The photoluminescence intensity becomes considerably enhanced at increased substitution levels, which highlights the capability of incorporated Cs+ cations in suppressing non-radiative recombination in a pure MA-based crystal, possibly related to the mitigation of trapping. The substitution of Cs+ with MAPbBr3 allows innovative strategies to improve the proficiency of tandem solar cells by modifying their structural and photophysical properties.
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Affiliation(s)
- S Premkumar
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
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Babu R, Vardhaman AK, Dhavale VM, Giribabu L, Singh SP. MA2CoBr4: lead-free cobalt-based perovskite for electrochemical conversion of water to oxygen. Chem Commun (Camb) 2019; 55:6779-6782. [DOI: 10.1039/c9cc00878k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have synthesized a lead-free stable organic–inorganic perovskite (MA2CoBr4) by using non-hazardous solvents such as methanol and ethanol, which are eco-friendly and safe to handle in comparison to DMF, toluene, etc.
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Affiliation(s)
- Ramavath Babu
- Polymers and Functional Materials Division
- CSIR-Indian Institute of Chemical Technology (IICT)
- Hyderabad-500 007
- India
| | - Anil Kumar Vardhaman
- Polymers and Functional Materials Division
- CSIR-Indian Institute of Chemical Technology (IICT)
- Hyderabad-500 007
- India
| | - Vishal M. Dhavale
- CSIR-Central Electrochemical Research Institute
- CSIR Madras Complex
- Chennai-600 113
- India
| | - Lingamallu Giribabu
- Polymers and Functional Materials Division
- CSIR-Indian Institute of Chemical Technology (IICT)
- Hyderabad-500 007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Surya Prakash Singh
- Polymers and Functional Materials Division
- CSIR-Indian Institute of Chemical Technology (IICT)
- Hyderabad-500 007
- India
- Academy of Scientific and Innovative Research (AcSIR)
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