Stabilizing perovskite nanocrystals by controlling protective surface ligands density

Zheng, Weilin; Li, Zhichun; Zhang, Congyang; Wang, Bo; Zhang, Qinggang; Wan, Qun; Kong, Long; Liang, Li

doi:10.1007/s12274-019-2407-7

Cited by 56 publications

(57 citation statements)

References 33 publications

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“…Even so, unwashed particles showed a typical diameter of 8.5 ± 1.8 nm, whereas a diameter of 9.3 ± 2.0 nm was observed after 3 times of washing with toluene. This could be attributed to the possible removal of the capping agents from the PNP surface 37 which could reduce the final colloidal stability of the PNP. Moreover, the thinner organic shell formed around the nanoparticles could increase the probability of non-radiative transitions between them, thus decreasing the PLQY values.…”

Section: Resultsmentioning

confidence: 99%

Synthesis conditions influencing formation of MAPbBr3 perovskite nanoparticles prepared by the ligand-assisted precipitation method

Procházková

Scharber

Yumusak

et al. 2020

Sci Rep

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This work reports on an optimized procedure to synthesize methylammonium bromide perovskite nanoparticles. The ligand-assisted precipitation synthetic pathway for preparing nanoparticles is a cost-effective and promising method due to its ease of scalability, affordable equipment requirements and convenient operational temperatures. Nevertheless, there are several parameters that influence the resulting optical properties of the final nanomaterials. Here, the influence of the choice of solvent system, capping agents, temperature during precipitation and ratios of precursor chemicals is described, among other factors. Moreover, the colloidal stability and stability of the precursor solution is studied. All of the above-mentioned parameters were observed to strongly affect the resulting optical properties of the colloidal solutions. Various solvents, dispersion media, and selection of capping agents affected the formation of the perovskite structure, and thus qualitative and quantitative optimization of the synthetic procedure conditions resulted in nanoparticles of different dimensions and optical properties. The emission maxima of the nanoparticles were in the 508–519 nm range due to quantum confinement, as confirmed by transmission electron microscopy. This detailed study allows the selection of the best optimal conditions when using the ligand-assisted precipitation method as a powerful tool to fine-tune nanostructured perovskite features targeted for specific applications.

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Section: Resultsmentioning

confidence: 99%

Synthesis conditions influencing formation of MAPbBr3 perovskite nanoparticles prepared by the ligand-assisted precipitation method

Procházková

Scharber

Yumusak

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Stronger ligand binding to the perovskite core One of the most recognized strategies to compensate for the loss of organic ligands from the shelf life of the CsPbBr 3 PNCs is through post-synthetic treatment with quaternary ammonium salts, namely didodecyldimethylammonium bromide (DDAB) [53,59,60]. Compared with the linked OLA that shows a high likelihood of desorption, DDA + cations produce stronger binding with the negatively charged surface sites of the perovskite [61,62]. This induces the formation of hydrophobic monolayers, increasing the long-term stability of the PNCs.…”

Section: Surface Restoration Of Pncsmentioning

confidence: 99%

Progress in halide-perovskite nanocrystals with near-unity photoluminescence quantum yield

Gualdrón‐Reyes

Masi

Mora‐Seró

2021

Trends in Chemistry

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Colloidal halide perovskite nanocrystals (PNCs) are an outstanding case study due to their remarkable optical features, such as a high photoluminescence (PL) quantum yield (PLQY), tunable band gap, and narrow emission. Despite the impressive first reports of PLQYs beyond 70%, it has been observed that PLQY is limited by structural defects arising from labile interactions between the organic capping ligand and the inorganic core. Structural defects acting as trap states are key factors limiting both PNC PLQY and stability. In this review, we present the most studied, common, and alternative protocols to fully compensate for surface defects (e.g., halide vacancies, loss of protective capping ligands) as well as how to increase their stability and PLQY to unity (i.e., 100% when PLQY is expressed as a percentage). Defective PNCs after synthesis HighlightsThe loss of the ligand-protecting shell and the formation of surface defects in perovskite halide nanocrystals (PNCs) are the main issues causing deteriorated photoluminescence quantum yield (PLQY) and, thereby, reduced quality of the final product.

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“…Traditional organic ligands on the colloidal perovskite NC surface, such as oleic acid, oleylamine, thiols, phosphine ligands (such as trioctylphosphine, TOP; trioctylphosphine oxide, TOPO), or alkylammonium bromide (such as didodecyl dimethylammonium bromide, DDAB), are not considered as part of the heterojunction usually, for these ligands are based on alkyls which have large highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gaps. [153,154] However, conjugated functional molecules may have proper HOMO-LUMO levels favorable for charge/energy transfer with perovskite NCs, forming a type of special nano-heterojunction. Some typical examples are shown in Figure 20, such as perovskite NCs modified by benzoquinone (BQ) and phenothiazine (PTZ), [155,156] functionalized cinnamic acid (R-CAH), [157] 1-naphthalene carboxylic acid (NCA), [158] 1-pyrenecarboxylic acid (PCA), [159] 1-ampinopyrene (AMP), [160] anthraquinone-2-carboxylic acid (AQ), [161,162] 5-tetracene carboxylic acid (TCA), [163] tetrathiophene ligands 4Tm and 4TCNm, [164] N3 dye, [165] and fullerene (C60).…”

Section: Subnanometric Heterojunctions: Organicmentioning

confidence: 99%

Perovskite Nano‐Heterojunctions: Synthesis, Structures, Properties, Challenges, and Prospects

Wang

2020

Small Structures

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Scientific and industrial interest on perovskite semiconductor materials has grown rapidly in recent years. Through the efforts of researchers professionals in chemistry, physics, materials and electronics, etc., many records based on perovskites have been and are being refreshed. The brilliant performances emerge not only from the excellent properties of perovskite themselves, but also originate from the composite material systems of hybridizing perovskites with heteromaterials. Herein, first, the crystal and nanostructures of perovskite materials, semiconductor-based heterojunctions, and the categories of perovskite heterojunction are fundamentally introduced. Then, the state-of-the-art synthesis methods, size and structure control, electron structure-related physical properties, and applications of the perovskite-based nano-heterojunctions are comprehensively reviewed. Finally, perspectives on tackling challenges and developing trends are discussed.

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Stabilizing perovskite nanocrystals by controlling protective surface ligands density

Cited by 56 publications

References 33 publications

Synthesis conditions influencing formation of MAPbBr3 perovskite nanoparticles prepared by the ligand-assisted precipitation method

Synthesis conditions influencing formation of MAPbBr3 perovskite nanoparticles prepared by the ligand-assisted precipitation method

Progress in halide-perovskite nanocrystals with near-unity photoluminescence quantum yield

Perovskite Nano‐Heterojunctions: Synthesis, Structures, Properties, Challenges, and Prospects

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