Pressure‐Dependent Polymorphism and Band‐Gap Tuning of Methylammonium Lead Iodide Perovskite

Jiang, Shaojie; Fang, Yanan; Li, Ruipeng; Xiao, Hai; Crowley, Jason M.; Wang, Chenyu; White, Timothy J.; Goddard, William A.; Wang, Zhongwu; Baikie, Tom; Fang, Jiye

doi:10.1002/ange.201601788

Cited by 47 publications

(57 citation statements)

References 38 publications

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“…34 The band gap narrows under <1 GPa hydrostatic compression due to increasing in antibonding overlap of Pb-X; on the contrary, the band gap broadens under high pressure (>1 GPa), which could be due to phase change or amorphization in the high-pressure regime. 29 Hall et al also observed a blue shift of photoluminescence (PL) of CH3NH3PbI3 in the presence of humidity, and their first-principles computation shows a simultaneous increase of lattice constant and band gap when intercalating water into the lattice, 35 suggesting that the band gap may be tunable by straining the crystal lattice. Along similar lines, researchers have recently demonstrated an increase in band gap with epitaxial growth of CsPbBr3 on VO2 nanowires, which results from compressive in-plane strains in the CsPbBr3 during expansion of the nanowires.…”

Section: Introductionmentioning

confidence: 99%

Residual Nanoscale Strain in Cesium Lead Bromide Perovskite Reduces Stability and Shifts Local Luminescence

Li¹,

Luo²,

Holt

et al. 2019

Chem. Mater.

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Using nanoprobe X-ray diffraction microscopy, we investigate the relationship between residual strains from crystal growth in CsPbBr3 thin film crystals, their stability, and local bandgap. We find that out-of-plane compressive strain that arises from cooldown from crystallization is detrimental to material stability under X-ray irradiation. We also find that the optical photoluminescence red shifts as a result of the out-of-plane compressive strain. The sensitivity of bandgap to strain suggests possible applications such as stress-sensitive sensors.Mosaicity, the formation of small misorientations in neighboring crystalline domains we observe in some CsPbBr3 single crystals, indicates the significant variations in crystal quality that can occur even in single-crystal halide perovskites. The nano-diffraction results suggest that reducing local strains is a necessary path to enhance the stability of perovskite optoelectronic materials and devices from light-emitting diodes to high-energy detectors.

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Section: Introductionmentioning

confidence: 99%

Residual Nanoscale Strain in Cesium Lead Bromide Perovskite Reduces Stability and Shifts Local Luminescence

Li¹,

Luo²,

Holt

et al. 2019

Chem. Mater.

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“…(GA)(MA) 2 Pb 2 I 7 (GA = guanidinium) and (MA)(BA) 2 Pb 2 I 7 (BA = butylammonium) also only achieve maximal ∼5and ∼3.5-fold of enhancements within 1-2 GPa, respectively. Nonetheless, as pressure further increased to ∼6 and ∼1.75 Gpa, (3AMP)PbI 4 and (3AMP)(MA) 3 Pb 4 I 13 , respectively, appeared to exhibit decreased PL intensities, which is associated with the partial amorphization of their lattices (32)(33)(34).…”

Section: Significancementioning

confidence: 97%

“…S14-S16). This pressuredriven order-disorder transition is a general phenomenon for organic-inorganic perovskite materials (31,32,38). Now, we consider the anisotropic compression behavior of the D-J perovskites.…”

Section: Significancementioning

confidence: 99%

Highly tunable properties in pressure-treated two-dimensional Dion–Jacobson perovskites

Kong

Liu

Gong

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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The application of pressure can achieve novel structures and exotic phenomena in condensed matters. However, such pressure-induced transformations are generally reversible and useless for engineering materials for ambient-environment applications. Here, we report comprehensive high-pressure investigations on a series of Dion–Jacobson (D-J) perovskites A′An−1PbnI3n+1[A′ = 3-(aminomethyl) piperidinium (3AMP), A = methylammonium (MA),n= 1, 2, 4]. Our study demonstrates their irreversible behavior, which suggests pressure/strain engineering could viably improve light-absorber material not only in situ but also ex situ, thus potentially fostering the development of optoelectronic and electroluminescent materials. We discovered that the photoluminescence (PL) intensities are remarkably enhanced by one order of magnitude at mild pressures. Also, higher pressure significantly changes the lattices, boundary conditions of electronic wave functions, and possibly leads to semiconductor–metal transitions. For (3AMP)(MA)3Pb4I13, permanent recrystallization from 2D to three-dimensional (3D) structure occurs upon decompression, with dramatic changes in optical properties.

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“…To this end, surfactant-assisted self-assembly strategy can achieve more compact film configuration for stronger electronic coupling and charge mobility by building high-quality self-assembled QD films and reducing interparticle spacing among QDs. Recently, direct assembly such as stress-induced assembly has been developed to tune NP phase transformation and coupling (Jiang et al., 2016, Quan et al., 2011, Quan et al., 2013, Wang et al., 2015, Nagaoka et al., 2017, Zhu et al., 2017). It also requires ordered NP assemblies as the starting materials to accomplish the stress-induced tuning of phase transition and interparticle separation.…”

Section: Applicationsmentioning

confidence: 99%

Surfactant-Assisted Cooperative Self-Assembly of Nanoparticles into Active Nanostructures

2019

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Nanoparticles (NPs) of controlled size, shape, and composition are important building blocks for the next generation of devices. There are numerous recent examples of organizing uniformly sized NPs into ordered arrays or superstructures in processes such as solvent evaporation, heterogeneous solution assembly, Langmuir-Blodgett receptor-ligand interactions, and layer-by-layer assembly. This review summarizes recent progress in the development of surfactant-assisted cooperative self-assembly method using amphiphilic surfactants and NPs to synthesize new classes of highly ordered active nanostructures. Driven by cooperative interparticle interactions, surfactant-assisted NP nucleation and growth results in optically and electrically active nanomaterials with hierarchical structure and function. How the approach works with nanoscale materials of different dimensions into active nanostructures is discussed in details. Some applications of these self-assembled nanostructures in the areas of nanoelectronics, photocatalysis, and biomedicine are highlighted. Finally, we conclude with the current research progress and perspectives on the challenges and some future directions.

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Pressure‐Dependent Polymorphism and Band‐Gap Tuning of Methylammonium Lead Iodide Perovskite

Cited by 47 publications

References 38 publications

Residual Nanoscale Strain in Cesium Lead Bromide Perovskite Reduces Stability and Shifts Local Luminescence

Residual Nanoscale Strain in Cesium Lead Bromide Perovskite Reduces Stability and Shifts Local Luminescence

Highly tunable properties in pressure-treated two-dimensional Dion–Jacobson perovskites

Surfactant-Assisted Cooperative Self-Assembly of Nanoparticles into Active Nanostructures

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