(TTF)Pb<sub>2</sub>I<sub>5</sub>: A Radical Cation-Stabilized Hybrid Lead Iodide with Synergistic Optoelectronic Signatures

Low‐dimensional hybrid perovskites are receiving increased attention. One of the advantages of the low‐dimensional hybrids over their 3D counterparts is their greater structural flexibility towards the incorporation of bigger, more complex, organic cations. In this communication, we introduce a pyrene derivative as an organic cation containing an extended π‐system for use in a variety of low‐dimensional hybrids. We show that materials with different excitonic absorption features can be obtained by tuning the iodide/lead ratio in the precursor solutions, using the same pyrene cation. In this way, hybrids with optical characteristics corresponding to 2D, 1D and 0D hybrid perovskites are obtained. The formation and thermal stability of the different hybrids is analysed and compared.

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“…A hybrid with a APb 2 I 5 stoichiometry has been obtained with a TTF +. radical cation . However, since this TTF +.…”

Section: Figurementioning

confidence: 97%

“…It has been shown that the distortion of the PbÀI lattice (e. g. the PbÀIÀPb angle between adjacent PbI 6 octahedra) influences the excitonic absorption peak position. [11] Hence, this phase transition likely induces a distortion of the PbÀI lattice.…”

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confidence: 99%

Low‐Dimensional Hybrid Perovskites Containing an Organic Cation with an Extended Conjugated System: Tuning the Excitonic Absorption Features

et al. 2019

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“…Similarly, most of the organic cations are organo‐ammonium (RNH 3 + ) based, where the R group can range from aliphatic, aromatic small molecules to conjugated oligomers, polymers, and fullerenes. [3c,e,4a,12] Although there are studies showing that other types of cations such as tetrathiafulvalene and tropylium can be applied to lower dimensional perovskites including 0D, 1D, and corrugated 2D perovskites, such studies on 2D perovskite have not been reported, to our knowledge. This is likely because steric hindrance from these large cations would prevent them from fulfilling the required ratio of cation versus anion (e.g., 2:1 for butylammonium:PbI 4 , n = 1).…”

Section: Strict 2d (N = 1)mentioning

confidence: 99%

Two‐Dimensional Organic–Inorganic Hybrid Perovskites: A New Platform for Optoelectronic Applications

2018

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2D perovskites are recently attracting a significant amount of attention, mainly due to their improved stability compared with their 3D counterpart, e.g., the archetypical MAPbI . Interestingly, the first studies on 2D perovskites can be dated back to the 1980s. The most popular 2D perovskites have a general formula of (RNH ) MA M X , where n represents the number of metal halide octahedrons between the insulating organic cation layers. The optoelectronic properties of 2D perovskites, e.g., band gap, are highly dependent on the thickness of the inorganic layers (i.e., the value of n). Herein, 2D perovskites are arbitrarily divided into three classes, strict 2D (n = 1), quasi-2D (n = 2-5), and quasi-3D (n> 5), and research progress is summarized following this classification. The majority of existing 2D perovskites only employ very simple organic cations (e.g., butyl ammonium or phenylethyl ammonium), which merely function as the supporting layer/insulating barrier to achieve the 2D structure. Thus, a particularly important research question is: can functional organic cations be designed for these 2D perovskites, where these functional organic cations would play an important role in dictating the optoelectronic properties of these organic-inorganic hybrid materials, leading to unique device performance or applications?

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“…More recently, tetrathiafulvalene (TTF) radical cations have been introduced into 2 D lead halide nanosheets to produce crystalline (TTF)Pb 2 I 5 materials . TTF radical cations had previously been employed to create novel metallic and magnetic materials.…”

Section: Perspective and Outlookmentioning

confidence: 99%

Multidimensional Perovskites: A Mixed Cation Approach Towards Ambient Stable and Tunable Perovskite Photovoltaics

et al. 2016

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Although halide perovskites are able to deliver high power conversion efficiencies, their ambient stability still remains an obstacle for commercialization. Thus, promoting the ambient stability of perovskites has become a key research focus. In this review, we highlight the sources of instability in conventional 3 D perovskites, including water intercalation, ion migration, and thermal decomposition. Recently, the multidimensional perovskites approach has become one of the most promising strategies to enhance the stability of perovskites. As compared to pure 2 D perovskites, multidimensional perovskites typically possess more ideal band gaps, better charge transport, and lower exciton binding energy, which are essential for photovoltaic applications. The larger organic cations in multidimensional perovskites could also be more chemically stable at higher temperatures than the commonly used methylammonium cation. By combining 3 D and 2 D perovskites to form multidimensional perovskites, halide perovskite photovoltaics can attain both high efficiency and increased stability.

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(TTF)Pb₂I₅: A Radical Cation-Stabilized Hybrid Lead Iodide with Synergistic Optoelectronic Signatures

Cited by 42 publications

References 48 publications

Low‐Dimensional Hybrid Perovskites Containing an Organic Cation with an Extended Conjugated System: Tuning the Excitonic Absorption Features

Low‐Dimensional Hybrid Perovskites Containing an Organic Cation with an Extended Conjugated System: Tuning the Excitonic Absorption Features

Two‐Dimensional Organic–Inorganic Hybrid Perovskites: A New Platform for Optoelectronic Applications

Multidimensional Perovskites: A Mixed Cation Approach Towards Ambient Stable and Tunable Perovskite Photovoltaics

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(TTF)Pb2I5: A Radical Cation-Stabilized Hybrid Lead Iodide with Synergistic Optoelectronic Signatures

Cited by 42 publications

References 48 publications

Low‐Dimensional Hybrid Perovskites Containing an Organic Cation with an Extended Conjugated System: Tuning the Excitonic Absorption Features

Low‐Dimensional Hybrid Perovskites Containing an Organic Cation with an Extended Conjugated System: Tuning the Excitonic Absorption Features

Two‐Dimensional Organic–Inorganic Hybrid Perovskites: A New Platform for Optoelectronic Applications

Multidimensional Perovskites: A Mixed Cation Approach Towards Ambient Stable and Tunable Perovskite Photovoltaics

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Product

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(TTF)Pb₂I₅: A Radical Cation-Stabilized Hybrid Lead Iodide with Synergistic Optoelectronic Signatures