The Effect of Methylammonium Iodide on the Supersaturation and Interfacial Energy of the Crystallization of Methylammonium Lead Triiodide Single Crystals

Li, Bichen; Isikgor, Furkan H.; Coskun, Hikmet; Ouyang, Jianyong

doi:10.1002/ange.201710234

Cited by 6 publications

(7 citation statements)

References 30 publications

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“…The changes in the crystal shape do not indicate a change in the crystal symmetry or the formation of a polycrystalline component. Similar phenomena have been observed in MAPbI 3 single crystals 29 . Figure 1D, E presents the XRD patterns and enlarged views of the patterns in the 2θ range from~28 to 29°, respectively, for MAPbI 3−x Cl x (x = 0, 0.05, 0.1, and 0.3) single crystal samples at room temperature.…”

Section: Preparation and Characterization Of Mapbi 3−x CL X Single Crsupporting

confidence: 85%

Metastable alloying structures in MAPbI3−xClx crystals

et al. 2020

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Chlorine incorporation engineering has been widely used in optoelectronic devices based on methylammonium lead iodide (MAPbI3) perovskites. However, the characteristics of I/Cl alloying structures in MAPbI3−xClx mixed-halide perovskites and their influences on the optoelectronic properties have been issues of a long-standing controversy. Here, we present a detailed study of the I/Cl alloying structures in MAPbI3−xClx (x = 0.0 to 0.3) single crystals. We found that a small amount of Cl can substitute for the iodide of the PbI3 inorganic lattice, leading to a phase transition from the tetragonal to cubic phase and anomalous cation dynamics evolution. Analyses based on time-dependent X-ray diffraction, 207Pb NMR, and 2H NMR indicate that the alloying structures of the MAPbI3−xClx crystals are metastable and decompose over time. In addition, the photocurrent response measurement of MAPbI3−xClx proved a close correlation between the alloying structures and photoelectric properties of the material. This work sheds light on the essential understanding of the I/Cl alloying structure and provides a plausible explanation for the controversy regarding the role of chloride ions in optoelectronic devices.

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Section: Preparation and Characterization Of Mapbi 3−x CL X Single Crsupporting

confidence: 85%

Metastable alloying structures in MAPbI3−xClx crystals

et al. 2020

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“…15 At the same time, according to the results of dynamic light scattering, there is clear evidence of the existence of 1−2 nm colloid particles in perovskite solutions in GBL. 16 Interestingly, when we cooled backward a MAPbI 3 solution saturated at 60 °C down to room temperature, transparent precipitated crystals (see Figure S4) are found to be the cluster adduct 2. The size of the cluster anion [Pb 18 I 44 ] 8− is exactly 1− 2 nm (the distance between the opposite vertices of [Pb 18 I 44 ] 8− is 1.9 nm; the distance between the parallel planes is 1.1 nm, see Figure 2f).…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Solution Processing of Methylammonium Lead Iodide Perovskite from γ-Butyrolactone: Crystallization Mediated by Solvation Equilibrium

et al. 2018

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The chemical origin of solvents typically used for preparation of hybrid lead halide perovskitesdimethyl sulfoxide (DMSO), dimethylformamide (DMF), and γ-butyrolactone (GBL)strongly influences the process of perovskite crystallization because of the formation of intermediate adducts with different structures and morphology. The composition and crystal structures of the adducts depend on the coordination and binding ability of the solvents and the ratio of the precursors. New adducts of perovskite and GBL with either an unusual cluster structure, (MA) 8 (GBL) x [Pb 18 I 44 ], or an adduct, (MA) 2 (GBL) 2 Pb 3 I 8 , similar to those observed for DMF and DMSO are described for the first time. Complex equilibriums between chemical species existing in perovskite solutions are revealed by Raman spectroscopy. As a result, new features of the perovskite crystallization through intermediate adduct phases are discussed, and effective perovskite deposition pathways are suggested. ■ EXPERIMENTAL SECTIONMaterials and Methods. Methylammonium iodide (CH 3 NH 3 I = MAI, Dyesol), formamidinium iodide (CH 5 N 2 I = FAI, ≥98%, Dyesol), lead iodide (PbI 2 , 99%, Sigma-Aldrich), dimethyl sulfoxide

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“…To clarify the roles of the polymers and the PC synthetic mechanisms, the effect of polymers on the precursor solutions and crystallization process are systematically studied. The FAPbI 3 /GBL precursor solutions with different concentration of PPG-3000 are measured by dynamic light scattering (DLS) 31 , 32 , zeta potential, Raman, and UV–Vis absorption spectroscopy. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

A polymer controlled nucleation route towards the generalized growth of organic-inorganic perovskite single crystals

et al. 2021

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Recently, there are significant progresses in the growth of organic-inorganic lead halide perovskite single crystals, however, due to their susceptible nucleation and growth mechanisms and solvent requirements, the efficient and generalized growth for these single crystals is still challenging. Here we report the work towards this target with a polymer-controlled nucleation process for the highly efficient growth of large-size high-quality simple ternary, mixed-cations and mixed-halide perovskite single crystals. Among them, the carrier lifetime of FAPbBr3 single crystals is largely improved to 10199 ns. Mixed MA/FAPbBr3 single crystals are synthesized. The crucial point in this process is suggested to be an appropriate coordinative interaction between polymer oxygen groups and Pb2+, greatly decreasing the nuclei concentrations by as much as 4 orders of magnitudes. This polymer-controlled route would help optimizing the solution-based OIHPs crystal growth and promoting applications of perovskite single crystals.

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The Effect of Methylammonium Iodide on the Supersaturation and Interfacial Energy of the Crystallization of Methylammonium Lead Triiodide Single Crystals

Cited by 6 publications

References 30 publications

Metastable alloying structures in MAPbI3−xClx crystals

Metastable alloying structures in MAPbI3−xClx crystals

Solution Processing of Methylammonium Lead Iodide Perovskite from γ-Butyrolactone: Crystallization Mediated by Solvation Equilibrium

A polymer controlled nucleation route towards the generalized growth of organic-inorganic perovskite single crystals

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