Self‐assembly Behavior of Metal Halide Perovskite Nanocrystals

Abstract

Comprehensive Summary The self‐assembled metal halide perovskite (MHP) nanocrystal superlattices have attracted many researchers due to their exceptional optical and electrical properties. The bottom‐up self‐assembly can be facile to generate ideal and periodic structures. The superlattices’ stability can be improved and the photoluminescence lifetime can be extended by an order of magnitude. However, due to lack of a comprehensive and systematic understanding of the internal interactions on self‐assembled processes now, superlattices cannot be obtained controllably and play full use of their advantages. Therefore, gaining a deep insight of interaction forces about self‐assemblies is the premise of designing and controlling the degree of self‐assembly so as to prepare ideal materials. In this review, the definitions and functions of driving forces including van der Waals forces, electrostatic interactions and hydrogen bonds are discussed. Subsequently, we aim to explore the dominant factors affecting the driving forces, which can make a difference in the process of MHP self‐assembly. Based on current researches, we emphasize on three aspects−the core of nanocrystals, surface ligands and solvents−to clarify their critical roles in controlling the driving forces. Finally, the outlooks and perspectives of how to facilitate the MHP self‐assembly and their application on blue light emitting diodes are discussed.

Achieving High Moisture Tolerance in Pseudohalide Perovskite Nanocrystals for Light-Emitting Diode Application

“…In general, the interaction between NCs, which is regulated by the length of the hydrocarbon chain, is the key to the self-assembly behavior. It is anticipated that long chain OAm ligand exhibit stronger interaction through interpenetration than the short chain s -BA ligand, enabling NCs to vertically self-assemble. , The standalone, vertical NCs exhibited an average thickness of 3–5 nm, equaling n = 4–7 layers in the quasi-2D structure (Figures S5 and S6). Furthermore, some regions in PT1 consisted of large spherical particles, coated by cubic NCs on the peripheries.…”

Design Rules for Obtaining Narrow Luminescence from Semiconductors Made in Solution

“…On the heels of 3D bulk metal–halide perovskites, solution-processed nanocrystal analogues (MHP nanocrystals) have made a similarly explosive entrance to the field of nanotechnology for conventional and quantum optoelectronics within the past decade. The volume of research activity on MHP nanocrystals prompted us to defer to numerous reviews, all published since 2019, that detail the current states of MHP nanocrystal synthesis, , characterization, stability, − doping, shelling and heterostructures, , self-assembly, encapsulation, device applications, − and more, − with a particularly comprehensive review of the MHP nanocrystal state-of-the-art published in 2021 . Here, we aim to present the major considerations for achieving bright, efficient, and narrow emission from nanoscale ABX 3 structures synthesized in solution.…”

Design rules for obtaining narrow luminescence from semiconductors made in solution

“…On the heels of 3D bulk metal-halide perovskites, solution-processed nanocrystal analogues (MHP nanocrystals) have made a similarly explosive entrance to the field of nanotechnology for conventional and quantum optoelectronics within the last decade. The volume of research activity on MHP nanocrystals prompts us to defer to numerous reviews, all published since 2019, that detail the current states of MHP nanocrystal synthesis, 491,492 characterization, 493 stability, [494][495][496][497] doping, 498 heterostructures, 499 selfassembly, 500 encapsulation, 501 device applications, [502][503][504][505][506][507] and more, [508][509][510][511][512] with a particularly comprehensive review of the MHP nanocrystal state-of-the-art published in 2021. 513 Here, we aim to present the major considerations for achieving bright, efficient, and narrow emission from nanoscale ABX3 structure synthesized in solution.…”