Branched capping ligands improve the stability of cesium lead halide (CsPbBr<sub>3</sub>) perovskite quantum dots

Xie, Qifei; Wu, Dan; Wang, Xinzhong; Li, Yue; Fang, Fan; Wang, Zhaojin; Yan, Ma; Su, Mei; Peng, Shaomin; Liu, Haochen; Wang, Kai; Sun, Xiao Wei

doi:10.1039/c9tc03377g

Cited by 48 publications

(32 citation statements)

References 38 publications

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“…Moreover, the chemical stability of NCs depends on the shape of ligand molecules: long and branched molecules were demonstrated to achieve the best results in stabilizing nanomaterials. (Luo et al, 2017a;Yang et al, 2018;Kumar et al, 2019;Xie et al, 2019). In this regard, the lack of emission from the C6A samples can be attributed to a poor stabilization of the amine resulting in the formation of defect states that quench the PL radiative process.…”

Section: Photoluminescencementioning

confidence: 99%

Morphological and Optical Tuning of Lead-Free Cs2SnX6 (X = I, Br) Perovskite Nanocrystals by Ligand Engineering

et al. 2021

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In order to overcome the toxicity of lead halide perovskites, in recent years the research has focused on replacing lead with more environmentally friendly metals like tin, germanium, bismuth or antimony. However, lead-free perovskites still present instability issues and low performances that do not make them competitive when compared to their lead-based counterparts. Here we report the synthesis of lead-free Cs2SnX6 (X = Br, I) nanostructures of different shapes by using various surface ligands. These compounds are a promising alternative to lead halide perovskites in which the replacement of divalent lead (Pb(II)) with tetravalent tin (Sn(IV)) causes a modification of the standard perovskite structure. We investigate the effects of different amines on the morphology and size of Cs2SnX6 (X = Br, I) nanocrystals, presenting a facile hot-infection method to directly synthesize three-dimensional (3D) nanoparticles as well as two-dimensional (2D) nanoplatelets. The amines not only modify the shape of the crystals, but also affect their optical properties: increasing the length of the amine carbon chain we observe a widening in the bandgap of the compounds and a blue-shift of their emission peak. Alongside the tuning of the chemical composition and the reduction of the crystal size, our study offers a new insight in controlling the physical properties of perovskite nanocrystals by means of the capping ligands, paving the way for future research on lead-free materials.

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Section: Photoluminescencementioning

confidence: 99%

Morphological and Optical Tuning of Lead-Free Cs2SnX6 (X = I, Br) Perovskite Nanocrystals by Ligand Engineering

et al. 2021

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“…prepared CsPbBr 3 QDs with PDB modification to improve their stability. The PDB ligands polymerized on QDs surface can help the QDs against air, high temperature, polar solvent and UV illumination, the initial PL intensity of PDB‐CsPbBr 3 QDs is up to 82% after 436 h of light irradiation, which is about 27‐fold higher than CsPbBr 3 QDs with no PDB modification [81] …”

Section: Approaches For Enhancement the Stability Of Cspbx3 Perovskitementioning

confidence: 99%

Recent Progress in CsPbX₃ Perovskite Nanocrystals for Enhanced Stability and Photocatalytic Applications

Zhao

Wang

et al. 2021

ChemNanoMat

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Since the first discovery of CsPbX3 perovskite in 1893, exponentially increasing investigations on the tunable crystal structure, enhancement of stability against moisture, thermal, oxygen and light, and modulation of physicochemical properties have struggled to expand applications in photocatalysis. Here, the latest researches on modifying the structure and surface of CsPbX3 perovskite to achieve water, air, high temperature and light stability are systematically summarized, including surface passivation engineering, encapsulation strategy, semiconductor composite fabrication, and other strategies. Moreover, the major challenges of CsPbX3 perovskite act as photocatalyst for hydrogen evolution, degradation of organic dyestuff, CO2 reduction and photocatalytic organic synthesis are highlighted, and some perspectives from the current progress in development of CsPbX3‐based photocatalyst are given. This paper will provide a comprehensive perspective and inspire more constructive thoughts for further expanding the application boundaries of CsPbX3 perovskite.

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“…Wu and co-workers proposed a branched capping ligand n -propyltrimethoxysilane-dimethyloctadecyl-ammonium bromide (PDB) to improve the stability of CsPbBr 3 QDs. 30 Our group also reported a surface ligand diphenylammonium bromide (DPABr) to passivate the surface vacancies of the CsPbBr 3 NCs and improve PLQY. 31 Furthermore, two π-electron-rich phenyl rings help to increase the conductivity of the resulting CsPbBr 3 NCs to achieve better device performance.…”

Section: Introductionmentioning

confidence: 97%

Synthesis of Red Cesium Lead Bromoiodide Nanocrystals Chelating Phenylated Phosphine Ligands with Enhanced Stability

Peng

Yang

et al. 2021

ACS Omega

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Two new phosphine ligands, diphenylmethylphosphine (DPMP) and triphenylphosphine (TPP), were introduced onto cesium lead bromoiodide nanocrystals (CsPbBrI 2 NCs) to improve air stability in the ambient atmosphere. Incorporating DPMP or TPP ligands can also enhance film-forming and optoelectronic properties of the CsPbBrI 2 NCs. The results reveal that DPMP is a better ligand to stabilize the emission of CsPbBrI 2 NCs than TPP after storage for 21 days. The increased carrier lifetime and photoluminescence quantum yield (PLQY) of perovskite NCs are due to the surface passivation by DPMP or TPP ligands, which reduces nonradiative recombination at the trap sites. The DPMP and TPP-treated CsPbBrI 2 NCs were successfully utilized as red emitters for fabricating perovskite light-emitting diodes with enhanced performance and prolonged device lifetime relative to the pristine one.

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Branched capping ligands improve the stability of cesium lead halide (CsPbBr₃) perovskite quantum dots

Abstract: Functional branched group design of a ligand to improve the stability of CsPbBr3 quantum dots for phosphor-converted applications

Cited by 48 publications

References 38 publications

Morphological and Optical Tuning of Lead-Free Cs2SnX6 (X = I, Br) Perovskite Nanocrystals by Ligand Engineering

Morphological and Optical Tuning of Lead-Free Cs2SnX6 (X = I, Br) Perovskite Nanocrystals by Ligand Engineering

Recent Progress in CsPbX₃ Perovskite Nanocrystals for Enhanced Stability and Photocatalytic Applications

Synthesis of Red Cesium Lead Bromoiodide Nanocrystals Chelating Phenylated Phosphine Ligands with Enhanced Stability

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Branched capping ligands improve the stability of cesium lead halide (CsPbBr3) perovskite quantum dots

Abstract: Functional branched group design of a ligand to improve the stability of CsPbBr3 quantum dots for phosphor-converted applications

Cited by 48 publications

References 38 publications

Morphological and Optical Tuning of Lead-Free Cs2SnX6 (X = I, Br) Perovskite Nanocrystals by Ligand Engineering

Morphological and Optical Tuning of Lead-Free Cs2SnX6 (X = I, Br) Perovskite Nanocrystals by Ligand Engineering

Recent Progress in CsPbX3 Perovskite Nanocrystals for Enhanced Stability and Photocatalytic Applications

Synthesis of Red Cesium Lead Bromoiodide Nanocrystals Chelating Phenylated Phosphine Ligands with Enhanced Stability

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Product

Resources

About

Branched capping ligands improve the stability of cesium lead halide (CsPbBr₃) perovskite quantum dots

Recent Progress in CsPbX₃ Perovskite Nanocrystals for Enhanced Stability and Photocatalytic Applications