Quasi-2D halide perovskite crystals and their optoelectronic applications

Sheng, Xin; Li, Yahui; Xia, Ming; Shi, Enzheng

doi:10.1039/d2ta02219b

Cited by 25 publications

(18 citation statements)

References 116 publications

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“…Generally, the growth of low-dimensional perovskite thin films by solution-processing introduces a distribution of structural properties, most notably the dimensionality of the perovskite sheets and the number of octahedral layers, n. Ignoring the distribution of phases, 2D perovskites are obtained when one octahedral layer is separated by spacer cations (n = 1), while quasi-2D perovskites are obtained when a larger number of n octahedral layers (n = 2, 3,…) are separated. The somewhat arbitrary boundary between quasi-2D and 3D is typically drawn at around n = 5 layers, [51] beyond which the optoelectronic properties of the low-dimensional perovskite become comparable to the bulk material, [52] for example, properties like the exciton binding energies, optical bandgaps, etc. In reality, solution-processed lowdimensional perovskite films typically contain domains with different n values, that is, multiple phases and off-stoichiometry compositions, and optimization of the growth process is needed to improve phase purity.…”

Section: A Brief Introduction To 2d Perovskite Materialsmentioning

confidence: 99%

How to GIWAXS: Grazing Incidence Wide Angle X‐Ray Scattering Applied to Metal Halide Perovskite Thin Films

Steele

Solano

Hardy

et al. 2023

Advanced Energy Materials

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The frequency of reports utilizing synchrotron‐based grazing incident wide angle X‐ray scattering (GIWAXS) to study metal halide perovskite thin films has exploded recently, as this technique has proven invaluable for understanding several structure‐property relationships that fundamentally limit optoelectronic performance. The GIWAXS geometry and temporal resolution are also inherently compatible with in situ and operando setups (including ISOS protocols), and a relatively large halide perovskite research community has deployed GIWAXS to unravel important kinetic and dynamic features in these materials. Considering its rising popularity, the aim here is to accelerate the required learning curve for new experimentalists by clearly detailing the underlying analytical concepts which can be leveraged to maximize GIWAXS studies of polycrystalline thin films and devices. Motivated by the vast range of measurement conditions offered, together with the wide variety of compositions and structural motifs available (i.e., from single‐crystal and polycrystalline systems, to quantum dots and layered superlatices), a comprehensive framework for conducting effective GIWAXS experiments is outlined for different purposes. It is anticipated that providing a clear perspective for this topic will help elevate the quality of future GIWAXS studies—which have become routine—and provide the impetus required to develop novel GIWAXS approaches to resolve unsettled scientific questions.

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Section: A Brief Introduction To 2d Perovskite Materialsmentioning

confidence: 99%

How to GIWAXS: Grazing Incidence Wide Angle X‐Ray Scattering Applied to Metal Halide Perovskite Thin Films

Steele

Solano

Hardy

et al. 2023

Advanced Energy Materials

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“…The quasi-2D perovskite crystal can be divided into long-chain ammonium cation layers (or called organic layers or organic spacers) and octahedral perovskite layers. The organic layers serve as potential energy barriers in the organic–inorganic quantum well structure. , In addition, the organic layer plays an important role in reducing the trap density due to halide vacancies to promote radiative recombination. − Therefore, the quasi-2D perovskite crystal exhibits higher PLQY and stability than 3D perovskite crystals . As a result of a large dielectric constant difference between organic spacers and octahedral layered perovskites, the dielectric confinement effect can contribute to an increased exciton binding energy.…”

Section: Results and Discussionmentioning

confidence: 99%

Highly Enhanced Photoluminescence Quantum Yield of Phenethylammonium Halide-Passivated Inorganic Perovskite/Cellulose Nanocrystal Films

Liu

Chiang

Chen

et al. 2023

ACS Sustainable Chem. Eng.

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In recent years, perovskite quantum dots (PQDs) have become a promising candidate for developing next-generation displays due to their narrow emission width, tunable band gap, and near-unity photoluminescence quantum yield (PLQY). However, the major challenges of PQDs are their poor stability under oxygen-rich, high moisture, and continuous light irradiation conditions. Previously, we applied surfacefunctionalized cellulose nanocrystals (CNCs) to replace traditional ligands and successfully synthesized PQD/CNC films to improve the stability of PQDs. However, the PLQY of the PQDs/CNCs films is limited by the large crystals formed during the synthesis process. In this study, we incorporate phenethylammonium halide (PEAX, where X = Cl, Br, and I) during the synthesis process to form quasi-2D perovskite quantum well structures. The phenethylammonium halide provides a halide-rich environment and a more significant quantum confinement effect to PQDs in the CNC films. By combining the advantages of CNC and PEAX, stable light emission/conversion films with largely enhanced PLQY can be achieved. The PLQY of CsPbBr 1.5 Cl 1.5 , CsPbBr 3 , and CsPbBr 0.5 I 2.5 films with PEAX passivation can be improved more than 8 (from 1.2 to 10%), 3 (from 22 to 69%), and 18 (from 3 to 55%) fold, respectively. Therefore, the synergistic approach of CNC and PEAX passivation for light emission/conversion films demonstrated herein holds the potential for developing full-color, stable, and high-performance displays in the future.

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“…Preparation of 2D BA 2 MAPb 2 I 7 Crystal: BA 2 MAPb 2 I 7 crystal was grown using the inverse temperature crystal growth method reported in the literature. [35] Lead iodide (461 mg), methylamine iodide (79.5 mg), and n-butylamine iodide (160.8 mg) were dissolved in 1.8 ml hydroiodic acid solution (50%) and 0.2 ml hypophosphorous acid solution (50%), heated at 120 °C until boiling, with constant stirring, and maintained for 1 min until the material was completely dissolved. The solution was subsequently cooled slowly to room temperature to obtain crystals.…”

Section: Methodsmentioning

confidence: 99%

Transparent and Reusable Nanostencil Lithography for Organic–Inorganic Hybrid Perovskite Nanodevices

Han

Liu

Wang

et al. 2023

Adv Funct Materials

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Organic-inorganic hybrid perovskites have attracted considerable attention for developing novel optoelectronic devices owing to their excellent photo responses. However, conventional nanolithography of hybrid perovskites remains a challenge because they undergo severe damage in standard lithographic solvents, which prohibits device miniaturization and integration. In this study, a novel transparent stencil nanolithography (tSL) technique is developed based on focused ion beam (FIB)assisted polyethylene terephtha late (PET) direct patterning. The proposed tSL enables ultrahigh lithography resolution down to 100 nm and accurate stencil mask alignment. Moreover, the stencil mask can be reused more than ten times, which is costeffective for device fabrication. By applying this lithographic technique to hybrid perovskites, a highperformance 2D hybrid perovskite heterostructure photodetector is fabricated. The responsivity and detectivity of the proposed heterostructure photodetector can reach up to 28.3 A W −1 and 1.5 × 10 13 Jones, respectively. This tSL nanolithography technique based on FIBassisted PET direct patterning can effectively support the miniaturization and integration of hybridperovskitebased electronic devices.

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Quasi-2D halide perovskite crystals and their optoelectronic applications

Abstract: Due to the widely tunable and exceptional semiconductor properties, quasi-two-dimensional (2D) halide perovskites have been considered outstanding candidates for next-generation optoelectronic devices and thus gained rapid development over the last...

Cited by 25 publications

References 116 publications

How to GIWAXS: Grazing Incidence Wide Angle X‐Ray Scattering Applied to Metal Halide Perovskite Thin Films

How to GIWAXS: Grazing Incidence Wide Angle X‐Ray Scattering Applied to Metal Halide Perovskite Thin Films

Highly Enhanced Photoluminescence Quantum Yield of Phenethylammonium Halide-Passivated Inorganic Perovskite/Cellulose Nanocrystal Films

Transparent and Reusable Nanostencil Lithography for Organic–Inorganic Hybrid Perovskite Nanodevices

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