Composition-tuned MAPbBr<sub>3</sub> nanoparticles with addition of Cs<sup>+</sup> cations for improved photoluminescence

Dintakurti, Sai S. H.; Vashishtha, Parth; Giovanni, David; Fang, Yanan; Foo, Norton; Shen, Zexiang; Guet, C.; Sum, Tze Chien; White, Tim

doi:10.1039/d1ra03965b

Cited by 3 publications

(2 citation statements)

References 47 publications

(59 reference statements)

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“…In the multi‐peak cases, the peak position was the weighted average by the peak area. Based on the GIWAXS data, all the lattice constants for different films are smaller than that in a strain‐free MAPbBr 3 crystal, by referring to the experimentally determined lattice constants in the MAPbBr 3 bulk single crystal [ 50 ] (5.9266 Å) and the MAPbBr 3 powder [ 51 ] (5.92 Å) and theoretically estimated lattice constant via the Density Functional Theory simulation (5.96 Å). [ 52 ] This comparison indicates that the residual strains in all the different thin films are compressive.…”

Section: Resultsmentioning

confidence: 99%

Residual Strain Evolution Induced by Crystallization Kinetics During Anti‐Solvent Spin Coating in Organic–Inorganic Hybrid Perovskite

et al. 2023

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Organic–inorganic hybrid perovskite (OIHP) polycrystalline thin films are attractive due to their outstanding photoelectronic properties. The anti‐solvent spin coating method is the most widely used to synthesize these thin films, and the residual strain is inevitably originates and evolves during the process. However, this residual strain evolution induced by crystallization kinetics is still poorly understood. In this work, the in situ and ex situ synchrotron grazing‐incidence wide‐angle X‐ray scattering (GIWAXS) are utilized to characterize the evolution and distribution of the residual strain in the OIHP polycrystalline thin film during the anti‐solvent spin coating process. A mechanical model is established and the mechanism of the crystallization kinetics‐induced residual strain evolution process is discussed. This work reveals a comprehensive understanding of the residual strain evolution during the anti‐solvent spin coating process in the OIHP polycrystalline thin films and provides important guidelines for the residual strain‐related strain engineering, morphology control, and performance enhancement.

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Section: Resultsmentioning

confidence: 99%

Residual Strain Evolution Induced by Crystallization Kinetics During Anti‐Solvent Spin Coating in Organic–Inorganic Hybrid Perovskite

et al. 2023

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“…Intriguingly, this composition displayed improved crystallinity, fewer defect states, and a high PLQY . Other alkali metals (e.g., Cs + , Rb + , Na + , K + ) have also been explored as dopants at the A-site. , For instance, incorporating Rb + into the perovskite structure enhanced the phase stability of the material as it is a monovalent cation that has a low tendency to migrate and form defects. This enhances passivation, leading to a slower degradation rate and improved overall material stability …”

Section: Band Gap Tuningmentioning

confidence: 99%

Tunable Green-to-Blue Light Emitting Hybrid Perovskite Nanocrystals: Status Updates and Roadblocks

Bansal,

Bhatia,

Debroye

2023

ACS Photonics

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Perovskite nanocrystals (NCs) have demonstrated tremendous success in the field of optoelectronics due to their exceptional optical properties. Their high photoluminescence quantum yield (PLQY), tunable emission, defect tolerance, and facile synthesis make them ideal candidates for application in light-emitting diodes (LED). While the external quantum efficiency (EQE) of green and red perovskite-based LEDs (PeLEDs) has exceeded 20%, which is on par with organic- and quantum dot-based LEDs, blue PeLEDs still lag behind their counterparts. This review focuses on the evolution of obtaining highly efficient, tunable green-to-blue emitting methylammonium lead bromide (MAPbBr3) perovskite NCs by optimizing their optoelectronic properties. In detail, we first review the strategies for synthesizing and fine-tuning their emission spectra (450–520 nm), followed by a discussion on the key issues for achieving highly stable blue-emitting NCs and how to overcome these issues. The pros and cons of ligand engineering, metal doping, core–shell structure formation, and postsynthetic treatments are discussed. This Review also covers the progress in the fabrication of blue- and green-emitting PeLEDs, including device architecture optimization for maximizing the light out-coupling efficiency. Finally, the remaining challenges and future opportunities for blue-emitting MA-based PeLEDs are outlined.

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Pen-writing high-quality perovskite films and degradable optoelectronic devices

Zhang

et al. 2022

RSC Adv.

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Composition-tuned MAPbBr₃ nanoparticles with addition of Cs⁺ cations for improved photoluminescence

Abstract: Structural and optical properties of MAxCs1−xPbBr3 mixed cation colloidal nanoparticles with 13 mol% Cs composition exhibiting the longest charge carrier lifetime and enhancement in radiative pathways.

Cited by 3 publications

References 47 publications

Residual Strain Evolution Induced by Crystallization Kinetics During Anti‐Solvent Spin Coating in Organic–Inorganic Hybrid Perovskite

Residual Strain Evolution Induced by Crystallization Kinetics During Anti‐Solvent Spin Coating in Organic–Inorganic Hybrid Perovskite

Tunable Green-to-Blue Light Emitting Hybrid Perovskite Nanocrystals: Status Updates and Roadblocks

Pen-writing high-quality perovskite films and degradable optoelectronic devices

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Composition-tuned MAPbBr3 nanoparticles with addition of Cs+ cations for improved photoluminescence

Abstract: Structural and optical properties of MAxCs1−xPbBr3 mixed cation colloidal nanoparticles with 13 mol% Cs composition exhibiting the longest charge carrier lifetime and enhancement in radiative pathways.

Cited by 3 publications

References 47 publications

Residual Strain Evolution Induced by Crystallization Kinetics During Anti‐Solvent Spin Coating in Organic–Inorganic Hybrid Perovskite

Residual Strain Evolution Induced by Crystallization Kinetics During Anti‐Solvent Spin Coating in Organic–Inorganic Hybrid Perovskite

Tunable Green-to-Blue Light Emitting Hybrid Perovskite Nanocrystals: Status Updates and Roadblocks

Pen-writing high-quality perovskite films and degradable optoelectronic devices

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Composition-tuned MAPbBr₃ nanoparticles with addition of Cs⁺ cations for improved photoluminescence