Low-Dimensional Organometal Halide Perovskites

Lin, Haoran; Zhou, Chenkun; Tian, Yu; Siegrist, T.; Ma, Biwu

doi:10.1021/acsenergylett.7b00926

Cited by 552 publications

(573 citation statements)

References 57 publications

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“…For example, the extent of the quantum confinement in these hybrids can be tuned by changing their dimensionality. 2D, 1D, and 0D hybrids are bulk quantum materials, that can respectively be considered as bulk assemblies of 2D quantum wells, 1D quantum wires, and 0D quantum dots (as isolated metal halide clusters) . Especially the 1D and 0D hybrids remain underexplored, with a huge parameter space still open to be investigated …”

Section: Figurementioning

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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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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Section: Figurementioning

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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“…Unlike several low-dimensional perovskites that afford broadband emission from STEs, [40] pure 2D perovskite PEA 2 PbI 4 only shows narrowband emission from free and bound excitons even at low temperature. Unlike several low-dimensional perovskites that afford broadband emission from STEs, [40] pure 2D perovskite PEA 2 PbI 4 only shows narrowband emission from free and bound excitons even at low temperature.…”

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confidence: 95%

Broadband Extrinsic Self‐Trapped Exciton Emission in Sn‐Doped 2D Lead‐Halide Perovskites

et al. 2018

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Metal-halide perovskites represent a class of promising light absorbers for efficient solar cells. [1][2][3][4][5] The propensity of perovskite films for low-cost solution processing also encourages scientists to explore potential applications beyond solar cells. [6][7][8][9] In particular, as emitters, perovskites exhibit intriguing luminescent properties such as narrowband emission, spectral tunability, and high quantum efficiency, which enables applications in the microlasers and light-emitting diodes (LEDs). [10][11][12][13] The luminescence efficiency of perovskites generally relies on nanostructures that can spatially confine excitons, and consequently reduce the possibility of nonradiative recombination during the carrier/ exciton migration. However, nanocrystals, due to boundary scattering of carriers, generally face the problem of poor charge transport, which is undesirable for LED performance. 2D perovskites, where bulky organic layers and inorganic layers are alternately and periodically arranged, feature natural quantum-well structures. This quantum-well structure is regarded as promising LED emitters for decades. [14][15][16] However, low photoluminescence quantum yields (PLQYs, typically < 1%) of 2D perovskites at room temperature is a bottleneck to achieving high-performance LEDs. [17] The low PLQYs may be attributed to insufficient confinement of Wannier type excitons within the inorganic layers [18] as suggested by the long charge-carrier/exciton diffusion length (60 nm). [19] Engineering crystal structures of low-dimensional (0D to 2D) perovskites by employing suitable organic ammonium cations is the predominant methods for the tuning of luminescence, both in spectral coverage and efficiency. [20,21] In these cases, severe structural distortion of metal halide octahedra is a common feature because of the size mismatch between organic and inorganic components, which results in potential fluctuations. [22,23] Such fluctuations of potential within an inorganic layer of perovskite sometimes, but not always, [20,21] slow the diffusion of carriers or excitons, and consequently induce self-trapped excitons (STEs), which represents a type of bound states for efficient radiative recombination. However, the occurrence of exciton self-trapping in semiconductors is the exception rather than the rule. [24] In parallel, compositional engineering As emerging efficient emitters, metal-halide perovskites offer the intriguing potential to the low-cost light emitting devices. However, semiconductors generally suffer from severe luminescence quenching due to insufficient confinement of excitons (bound electron-hole pairs). Here, Sn-triggered extrinsic self-trapping of excitons in bulk 2D perovskite crystal, PEA 2 PbI 4 (PEA = phenylethylammonium), is reported, where exciton self-trapping never occurs in its pure state. By creating local potential wells, isoelectronic Sn dopants initiate the localization of excitons, which would further induce the large lattice deformation around the impurities to accommodate the se...

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“…Such low‐dimensional perovskites are generally classified as two‐dimensional (2D) perovskites, one‐dimensional (1D) perovskites, and zero‐dimensional (0D) perovskites. Based on the periodical spatial arrangement of the confined inorganic octahedral units and the surrounding organic species, these low‐dimensional perovskites can be regarded as bulk assemblies of isolated octahedral sheets, octahedral chains, or octahedral clusters (Figure a–c) and exhibit different dimensionalities at the molecular level . Note that the terms of 2D, 1D, and 0D perovskites discussed in this review specifically refers to the crystal structural dimensionalities at the molecular level, which are conceptually different from morphological 2D nanosheets/nanoplates, 1D nanowires/nanorods, and 0D nanoparticles constructed by 3D‐networked octahedral units with a chemical composition of ABX 3 (Figure a and b) .…”

Section: Introductionmentioning

confidence: 99%

Progress and Perspective in Low‐Dimensional Metal Halide Perovskites for Optoelectronic Applications

et al. 2018

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Organic–inorganic metal halide perovskites with three‐dimensional (3D) crystal structures have attracted tremendous attention due to their successful demonstrations in varying optoelectronic applications, particularly in photovoltaics (PV). Despite the rapid progress in achieving high performance in optoelectronic devices, the long‐term instability and lead toxicity in 3D perovskites are still two major challenges hindering their steps toward commercialization. To overcome these issues, a series of low‐dimensional perovskites and their derivatives are investigated, aiming at prolonging device lifetime and reducing toxicity. Herein, recent advances of low‐dimensional perovskites and their derivatives in PV with a focus on enhanced long‐term stability and reduced toxicity are reviewed. The fundamental understanding on their crystal structures and properties is presented. Beyond PV, the exploration of low‐dimensional perovskites for other promising optoelectronic applications is also summarized. In addition, the current challenges and future opportunities are discussed to provide a roadmap to the development of low‐dimensional perovskites.

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Low-Dimensional Organometal Halide Perovskites

Cited by 552 publications

References 57 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

Broadband Extrinsic Self‐Trapped Exciton Emission in Sn‐Doped 2D Lead‐Halide Perovskites

Progress and Perspective in Low‐Dimensional Metal Halide Perovskites for Optoelectronic Applications

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