Impact of Bifunctional Ligands on Charge Transfer Kinetics in CsPbBr<sub>3</sub>–CdSe/CdS/ZnS Nanohybrids

Khurana, Swati; Hassan, Md. Samim; Yadav, Priyesh; Ghosh, Dibyajyoti; Sapra, Sameer

doi:10.1021/acs.jpclett.2c00067

Cited by 10 publications

(11 citation statements)

References 49 publications

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“…Hybrid layered perovskites exhibit useful optoelectronic properties with some attractive features as compared to their 3D analogues. − They display significant ambient stability, greater chemical and structural diversity, ease of device fabrication, and excellent tunability of properties. , The discovery of hybrid layered double perovskite (LDP) is a recent advancement in this field . These LDPs consist of monovalent and trivalent metals, arranged in a regular fashion forming 2D inorganic layer of perovskite with large organic amine cations separating the inorganic layers and balancing the charge.…”

Section: Introductionmentioning

confidence: 99%

Elucidating the Mn²⁺ Dopant Sites in Two-Dimensional Na–In Halide Perovskite

et al. 2023

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The layered hybrid double perovskites (LDPs) possess excellent stability and environmental friendliness, which makes them remarkable semiconducting materials. Contrary to significant advancements, the nonfluorescent nature at ambient temperature and pressure is still a major hurdle in this intriguing family. Here, we demonstrate doping of the transition metal cation Mn 2+ in two-dimensional (2D) (PEA) 4 NaInCl 8 (PEA = phenylethylamine) LDP, by a solution-processed crystallization method. This results in broadband emission at ambient conditions and initial contraction followed by expansion of host lattice on increasing dopant concentration. A higher dopant feed ratio in this wide band gap material leads to the absorption at 2.95 eV due to the 6 A 1 ( 6 S) → 4 A 1 ( 4 G) transitions on Mn 2+ centers. First-principles calculations based on density functional theory (DFT) confirm that Mn 2+ in substitutional sites results in lattice contraction while interstitial site Mn 2+ doping leads to lattice expansion. The potential of Mn 2+ to improve optical and magnetic properties of host lattice and a deeper understanding of distribution of Mn 2+ dopant make these LDPs a promising material for emitters for solid-state lighting and magneto-optical applications.

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Section: Introductionmentioning

confidence: 99%

Elucidating the Mn²⁺ Dopant Sites in Two-Dimensional Na–In Halide Perovskite

et al. 2023

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“…[1][2][3][4][5][6][7] However, despite their promising electronic and optical properties, commercialization of lead (Pb)-based perovskites is hindered by their instability and toxicity. [8][9][10][11][12][13][14][15][16][17][18][19] Hence, in the Pb halide perovskites, toxic Pb can be replaced with less toxic metals to make a highly desirable new class of materials called halide double perovskites (DPs) that preserve their remarkable properties. [20][21][22][23][24][25][26][27][28] Lead-free double perovskite semiconductors have attracted attention due to their high thermal and structural stability under ambient conditions, and highly tunable band gap.…”

Section: Introductionmentioning

confidence: 99%

Extending the absorption of Cs₂AgBiCl₆ double perovskite to the near infra-red region by copper doping

Lamba,

Kumar,

Dhankhar

et al. 2024

J. Mater. Chem. C

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“…Colloidal nanocrystals (NCs) of lead halide perovskites (LHPs) exhibit exciting optoelectronic properties for various device applications because of their high photoluminescence quantum yields (PLQYs), high absorption coefficients, size, and composition-tunable optoelectronic properties. − However, these materials are enriched with surface defects due to the presence of a large number of halide vacancies . These defect states act as the trapping centers for charge carriers, resulting in the lowering of PLQY and stability of LHPs. , All of these factors greatly affect the power conversion efficiency (PCE) as well as the lifetime of photovoltaic devices. − Thus, there is a need to engineer the defect chemistry via modifying the surface of LHPs, which can tailor the optoelectronic properties and enhance the stability for better practical applications.…”

Section: Introductionmentioning

confidence: 99%

Defect Passivation Results in the Stability of Cesium Lead Halide Perovskite Nanocrystals

et al. 2023

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Nanoheterostructures (NHSs) based on lead halide perovskites (LHPs) and chalcogenide quantum dots have proved to be promising candidates for photovoltaic device applications. However, understanding the defect chemistry at the interfaces of LHPs and chalcogenides is essential to stabilize them and further tune their optoelectronic properties. Here, we demonstrate a route for designing CsPbBr 3 −PbSe NHSs and other derivatives of LHP-based NHSs using defect-rich MoSe 2 nanosheets (NSs) and study the effect of the size of PbSe NPs on their optical properties. In this synthesis route, PbSe nanoparticles (NPs) are formed at an early stage of the reaction through a unique cation displacement reaction, over which CsPbBr 3 nanocrystals (NCs) are epitaxially grown. Using this methodology, a nearly 3-fold enhancement in photoluminescence (PL) is achieved, whereas other selenium precursors, which form larger PbSe NPs, result in negligible PL enhancement with respect to the pure CsPbBr 3 NCs. Detailed density functional theory (DFT) calculations suggest that the PbSe NPs are responsible for passivating the surface defects that consequently enhance the PL intensity. However, in the case of larger PbSe NPs, the associated valence and conduction bands lie within the band-gap region of CsPbBr 3 , creating a type-I heterostructure between the two materials, thereby affecting the luminescence properties. Strong passivation of surface defects in CsPbBr 3 −PbSe NHSs is also evidenced from low-temperature PL studies. Furthermore, the resulting CsPbBr 3 −PbSe NHSs demonstrate enhanced stability in the presence of water and do not degrade under ambient conditions for several months.

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Impact of Bifunctional Ligands on Charge Transfer Kinetics in CsPbBr₃–CdSe/CdS/ZnS Nanohybrids

Cited by 10 publications

References 49 publications

Elucidating the Mn²⁺ Dopant Sites in Two-Dimensional Na–In Halide Perovskite

Elucidating the Mn²⁺ Dopant Sites in Two-Dimensional Na–In Halide Perovskite

Extending the absorption of Cs₂AgBiCl₆ double perovskite to the near infra-red region by copper doping

Defect Passivation Results in the Stability of Cesium Lead Halide Perovskite Nanocrystals

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Impact of Bifunctional Ligands on Charge Transfer Kinetics in CsPbBr3–CdSe/CdS/ZnS Nanohybrids

Cited by 10 publications

References 49 publications

Elucidating the Mn2+ Dopant Sites in Two-Dimensional Na–In Halide Perovskite

Elucidating the Mn2+ Dopant Sites in Two-Dimensional Na–In Halide Perovskite

Extending the absorption of Cs2AgBiCl6 double perovskite to the near infra-red region by copper doping

Defect Passivation Results in the Stability of Cesium Lead Halide Perovskite Nanocrystals

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Product

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Impact of Bifunctional Ligands on Charge Transfer Kinetics in CsPbBr₃–CdSe/CdS/ZnS Nanohybrids

Elucidating the Mn²⁺ Dopant Sites in Two-Dimensional Na–In Halide Perovskite

Elucidating the Mn²⁺ Dopant Sites in Two-Dimensional Na–In Halide Perovskite

Extending the absorption of Cs₂AgBiCl₆ double perovskite to the near infra-red region by copper doping