Size Segregation and Atomic Structural Coherence in Spontaneous Assemblies of Colloidal Cesium Lead Halide Nanocrystals

A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

Nanoscale ◽

10.1039/c9nr07377a ◽

2019 ◽

Vol 11 (45) ◽

pp. 21824-21833 ◽

Cited By ~ 9

Author(s):

Jyoti V. Patil ◽

Sawanta S. Mali ◽

Chang Kook Hong

Keyword(s):

Thin Films ◽

Grain Size ◽

Solar Cells ◽

Power Conversion Efficiency ◽

Conversion Efficiency ◽

Power Conversion ◽

Perovskite Solar Cells ◽

Inorganic Perovskite ◽

Halide Perovskite ◽

Lead Halide

Controlling the grain size of the organic–inorganic perovskite thin films using thiourea additives now crossing 2 μm size with >20% power conversion efficiency.

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Depletion of coating color components in the blade coating process circulation

TAPPI Journal ◽

10.32964/tj10.9.17 ◽

2011 ◽

Vol 10 (9) ◽

pp. 17-23 ◽

Cited By ~ 1

Author(s):

ANNE RUTANEN ◽

MARTTI TOIVAKKA

Keyword(s):

Fine Particles ◽

Particle Density ◽

Stable Process ◽

Size Fraction ◽

Color Stability ◽

Strong Interactions ◽

Coating Process ◽

Size Segregation ◽

Coating Color ◽

Average Size

Coating color stability, as defined by changes in its solid particle fraction, is important for runnability, quality, and costs of a paper coating operation. This study sought to determine whether the size or density of particles is important in size segregation in a pigment coating process. We used a laboratory coater to study changes in coating color composition during coating operations. The results suggest that size segregation occurs for high and low density particles. Regardless of the particle density, the fine particle size fraction (<0.2 μm) was the most prone for depletion, causing an increase in the average size of the particles. Strong interactions between the fine particles and other components also were associated with a low depletion tendency of fine particles. A stable process and improved efficiency of fine particles and binders can be achieved by controlling the depletion of fine particles.

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THERMAL TRANSPORT BEHAVIORS IN LEAD HALIDE PEROVSKITES

10.1615/ihtc16.nmt.023055 ◽

2018 ◽

Author(s):

Wee-Liat Ong ◽

Giselle Elbaz ◽

Evan A. Doud ◽

Philip Kim ◽

Daniel Paley ◽

...

Keyword(s):

Thermal Transport ◽

Halide Perovskites ◽

Lead Halide

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Elucidating the Weakly Reversible Cs-Pb-Br Perovskite Nanocrystal Reaction Network with High-Throughput Maps and Transformations

10.26434/chemrxiv.12253277.v2 ◽

2020 ◽

Author(s):

Jakob Dahl ◽

Xingzhi Wang ◽

Xiao Huang ◽

Emory Chan ◽

Paul Alivisatos

Keyword(s):

High Throughput ◽

Dynamic Equilibrium ◽

Reaction Network ◽

Substantial Impact ◽

Equilibrium Behavior ◽

Automated Method ◽

Lead Bromide ◽

Different Shapes ◽

Complex Chemistry ◽

Lead Halide

<p>Advances in automation and data analytics can aid exploration of the complex chemistry of nanoparticles. Lead halide perovskite colloidal nanocrystals provide an interesting proving ground: there are reports of many different phases and transformations, which has made it hard to form a coherent conceptual framework for their controlled formation through traditional methods. In this work, we systematically explore the portion of Cs-Pb-Br synthesis space in which many optically distinguishable species are formed using high-throughput robotic synthesis to understand their formation reactions. We deploy an automated method that allows us to determine the relative amount of absorbance that can be attributed to each species in order to create maps of the synthetic space. These in turn facilitate improved understanding of the interplay between kinetic and thermodynamic factors that underlie which combination of species are likely to be prevalent under a given set of conditions. Based on these maps, we test potential transformation routes between perovskite nanocrystals of different shapes and phases. We find that shape is determined kinetically, but many reactions between different phases show equilibrium behavior. We demonstrate a dynamic equilibrium between complexes, monolayers and nanocrystals of lead bromide, with substantial impact on the reaction outcomes. This allows us to construct a chemical reaction network that qualitatively explains our results as well as previous reports and can serve as a guide for those seeking to prepare a particular composition and shape. </p>

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