Charge carrier localised in zero-dimensional (CH3NH3)3Bi2I9 clusters

Ni, Chengsheng; Hedley, Gordon J.; Payne, Julia L.; Švrček, Vladimír; McDonald, Calum; Jagadamma, Lethy Krishnan; Edwards, P. R.; Martin, Robert; Jain, Gunisha; Carolan, Darragh; Mariotti, Davide; Maguire, Paul; Samuel, Ifor D. W.; Irvine, John T. S.

doi:10.1038/s41467-017-00261-9

Cited by 64 publications

(84 citation statements)

References 33 publications

(53 reference statements)

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“…Recently, several 0D hybrid perovskite crystals were discovered and their optical properties have been reported. Since these 0D perovskite crystals have isolated octahedra similar to MDI, there is a good possibility that these crystals will also exhibit ultralow thermal conductivity . It is noteworthy that taking advantage of the congruent melting nature, MDI can be directly processed into patterns on any given substrates using stamps (Figure h).…”

Section: Resultsmentioning

confidence: 99%

A 0D Lead‐Free Hybrid Crystal with Ultralow Thermal Conductivity

Haque

Gandi

Mohanraman

et al. 2019

Adv Funct Materials

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Organic-inorganic hybrid materials are of significant interest owing to their diverse applications ranging from photovoltaics and electronics to catalysis. Control over the organic and inorganic components offers flexibility through tuning their chemical and physical properties. Herein, it is reported that a new organic-inorganic hybrid, [Mn(C 2 H 6 OS) 6 ]I 4 , with linear tetraiodide anions exhibit an ultralow thermal conductivity of 0.15 ± 0.01 W m −1 K −1 at room temperature, which is among the lowest values reported for organicinorganic hybrid materials. Interestingly, the hybrid compound has a unique 0D structure, which extends into 3D supramolecular frameworks through nonclassical hydrogen bonding. Phonon band structure calculations reveal that low group velocities and localization of vibrational energy underlie the observed ultralow thermal conductivity, which could serve as a general principle to design novel thermal management materials.

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Section: Resultsmentioning

confidence: 99%

A 0D Lead‐Free Hybrid Crystal with Ultralow Thermal Conductivity

Haque

Gandi

Mohanraman

et al. 2019

Adv Funct Materials

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“…1000 nm. The optical band gap, E g , of a semiconductor can be estimated from the Tauc plots (Figure 1(d)), where the curve of converted (h) 2 are plotted versus h from the UV-vis spectrum, in which , h, and  are the absorption coefficient, Planck constant, and light frequency, respectively [44]. A good linear region was found if m is equal 2 for a direct band gap.…”

Section: Resultsmentioning

confidence: 99%

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Abdellatif

Zhang

Wang

et al. 2019

Chemical Engineering Journal

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Graphitic carbon nitride has been considered as a promising metal-free visible light photocatalyst for air pollutants oxidation due to its suitable band-gap energy and higher conduction band edge. Herein, we have developed a facile approach for dramatically downwards shifting band edge positions of carbon nitride up by about 1 eV via in-plane heterojunction with graphitic carbon units to enhance the oxidation capability of the electron holes generated from the valence band. The graphitic carbon units in junction with tri-s-triazine domains were clearly observed and its in-plane hybridization with carbon nitride was formed during the copolymerization using melamine with a small amount of m-phenylenediamine as the precursors. The direct intralayer junction between the tri-s-triazine and the graphitic carbon domain, essentially different with interlayer junction reported in literature, is able to shift downwards the band edge positions via merging electron density of states of carbon nitride with that of graphitic carbon, and thus would be beneficial for separation of photoexcited charge carriers and generation of hydroxyl radicals for the oxidation of pollutants. The hybrid photocatalyst prepared with a small quantity (less than 1%) of m-phenylenediamine and melamine as precursors has shown much enhanced NO oxidation to final products(NO 2 and NO 3-) and increased NO removal 10% than the one from melamine only.

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“…Generally, the formula A 3 Bi 2 X 9 is commonly adopted in Bi‐based halide hybrids, where A is a monovalent cation (e.g., Cs + , Rb + , or MA + ) and X is a monovalent halide anion (Cl − , Br − , or I − ) . The A 3 Bi 2 I 9 (A=Cs + , MA + ) compounds are the most studied polymorph type for potential photovoltaic applications, consisting of face‐sharing bioctahedral [Bi 2 I 9 ] 3− clusters alternating with Cs + or MA + cations, resulting in a 0 D molecular salt crystal structure with space group P 6 3 / mmc (Figure ) ,. In contrast, MA 3 Bi 2 Cl 9 adopts a 1 D zigzag double‐chain‐stack structure with the space group Pnma , consisting of distorted [BiCl 6 ] 3− octahedra and three crystallographically inequivalent CH 3 NH 3 + cations .…”

Section: Bi‐based Halide Perovskite‐like Materials For Photovoltaic Amentioning

confidence: 99%

Bismuth Halide Perovskite‐Like Materials: Current Opportunities and Challenges

2019

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Metal halide perovskites have recently emerged as promising photovoltaic materials for application in solar cells with high power conversion efficiencies exceeding 23 %. In the years since such high efficiencies have been attained, investigations have mainly focused on the state‐of‐the‐art 3 D Pb‐based halide perovskite materials. However, the high toxicity of Pb and intrinsic instability of the pristine perovskite materials have become great obstacles to their industrial application and commercialization. To address these serious issues, it is imperative to explore low‐toxicity metal halide perovskites or their derivatives to substitute Pb‐based materials for better future development. Currently, Bi‐based halide perovskite‐like materials are attracting increased interest as environmentally friendly alternatives for photovoltaic applications. This Concept highlights recent advances of Bi‐based halide perovskite‐like materials in terms of understanding and modifying their fundamental properties and related device performance, with a focus on current challenges, opportunities for future development, and diversification of device applications.

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Charge carrier localised in zero-dimensional (CH3NH3)3Bi2I9 clusters

Cited by 64 publications

References 33 publications

A 0D Lead‐Free Hybrid Crystal with Ultralow Thermal Conductivity

A 0D Lead‐Free Hybrid Crystal with Ultralow Thermal Conductivity

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Bismuth Halide Perovskite‐Like Materials: Current Opportunities and Challenges

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