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Journal articles on the topic 'Methylammonium Dipoles'

Author: Grafiati
Published: 6 September 2023
Last updated: 31 July 2025

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1

Govinda, Sharada, Bhushan P. Kore, Menno Bokdam, et al. "Behavior of Methylammonium Dipoles in MAPbX3 (X = Br and I)." Journal of Physical Chemistry Letters 8, no. 17 (2017): 4113–21. http://dx.doi.org/10.1021/acs.jpclett.7b01740.

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2

Han, Jinyoung, Hannah Kwon, Eunah Kim, Dong-Wook Kim, Hae Jung Son, and Dong Ha Kim. "Interfacial engineering of a ZnO electron transporting layer using self-assembled monolayers for high performance and stable perovskite solar cells." Journal of Materials Chemistry A 8, no. 4 (2020): 2105–13. http://dx.doi.org/10.1039/c9ta12750j.

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The SAM layer which formed hydrogen-bonding to the methylammonium of the perovskite induced dipole moments at the interface, resulting in energy band bending and increased built-in voltage, and consequently, improved charge transfer of the PSC.
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3

Wu, Ming-Chung, Ching-Mei Ho, Kai-Chi Hsiao, Shih-Hsuan Chen, Yin-Hsuan Chang, and Meng-Huan Jao. "Antisolvent Engineering to Enhance Photovoltaic Performance of Methylammonium Bismuth Iodide Solar Cells." Nanomaterials 13, no. 1 (2022): 59. http://dx.doi.org/10.3390/nano13010059.

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High absorption ability and direct bandgap makes lead-based perovskite to acquire high photovoltaic performance. However, lead content in perovskite becomes a double-blade for counterbalancing photovoltaic performance and sustainability. Herein, we develop a methylammonium bismuth iodide (MBI), a perovskite-derivative, to serve as a lead-free light absorber layer. Owing to the short carrier diffusion length of MBI, its film quality is a predominant factor to photovoltaic performance. Several candidates of non-polar solvent are discussed in aspect of their dipole moment and boiling point to rev
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4

Tian, Congcong, Zhanfei Zhang, Anxin Sun, et al. "Tuning phase stability and interfacial dipole for efficient methylammonium-free Sn-Pb perovskite solar cells." Nano Energy 116 (November 2023): 108848. http://dx.doi.org/10.1016/j.nanoen.2023.108848.

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5

Kaválek, Jaromír, Vladimír Macháček, Makky M. M. Hassanien, and Vojeslav Štěrba. "Base-catalyzed formation of spiro adduct from N-methyl-N-(2,4,6-trinitrophenyl)glycinamide, the smiles rearrangement of the amide in methanol." Collection of Czechoslovak Chemical Communications 53, no. 3 (1988): 601–18. http://dx.doi.org/10.1135/cccc19880601.

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The reaction of N-methyl-N-(2,4,6-trinitrophenyl)glycinamide (Ic with methoxide in methanol produces the spiro adduct IIc(A). In methanolic acetate buffers, the equilibrium is rapidly established between the spiro adduct IIc(A) and the dipolar ion of 2-methylamino-N-(2,4,6-trinitrophenyl)acetamide (IIIc(Z)). The equilibrium constant of the reaction IIIc(Z) ⇆ IIc(A) + H+ is by eight orders of magnitude greater than that of the analogous cyclization of 2-methylamino-N-methyl-N-(2,4,6-trinitrophenyl)acetamide to the spiro adduct. In chloracetate buffers, the dipolar ion is protonated to give 2-me
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6

Park, Heesoo, Syam Kumar, Sanjay Chawla, and Fedwa El-Mellouhi. "Design Principles of Large Cation Incorporation in Halide Perovskites." Molecules 26, no. 20 (2021): 6184. http://dx.doi.org/10.3390/molecules26206184.

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Perovskites have stood out as excellent photoactive materials with high efficiencies and stabilities, achieved via cation mixing techniques. Overcoming challenges to the stabilization of Perovskite solar cells calls for the development of design principles of large cation incorporation in halide perovskite to accelerate the discovery of optimal stable compositions. Large fluorinated organic cations incorporation is an attractive method for enhancing the intrinsic stability of halide perovskites due to their high dipole moment and moisture-resistant nature. However, a fluorinated cation has a l
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7

Simenas, Mantas, Sergejus Balciunas, Jacob N. Wilson, et al. "Suppression of phase transitions and glass phase signatures in mixed cation halide perovskites." Nature Communications 11, no. 1 (2020). http://dx.doi.org/10.1038/s41467-020-18938-z.

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Abstract Cation engineering provides a route to control the structure and properties of hybrid halide perovskites, which has resulted in the highest performance solar cells based on mixtures of Cs, methylammonium, and formamidinium. Here, we present a multi-technique experimental and theoretical study of structural phase transitions, structural phases and dipolar dynamics in the mixed methylammonium/dimethylammonium MA1-xDMAxPbBr3 hybrid perovskites (0 ≤ x ≤ 1). Our results demonstrate a significant suppression of the structural phase transitions, enhanced disorder and stabilization of the cub
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8

Leguy, Aurelien M. A., Jarvist Moore Frost, Andrew P. McMahon, et al. "The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells." Nature Communications 6, no. 1 (2015). http://dx.doi.org/10.1038/ncomms8124.

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Abstract Methylammonium lead iodide perovskite can make high-efficiency solar cells, which also show an unexplained photocurrent hysteresis dependent on the device-poling history. Here we report quasielastic neutron scattering measurements showing that dipolar CH3NH3 + ions reorientate between the faces, corners or edges of the pseudo-cubic lattice cages in CH3NH3PbI3 crystals with a room temperature residence time of ∼14 ps. Free rotation, π-flips and ionic diffusion are ruled out within a 1–200-ps time window. Monte Carlo simulations of interacting CH3NH3 + dipoles realigning within a 3D lat
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9

Sukmas, Wiwittawin, Vichawan Sakulsupich, Prutthipong Tsuppayakorn-aek, et al. "Preferred oriented cation configurations in high pressure phases IV and V of methylammonium lead iodide perovskite." Scientific Reports 10, no. 1 (2020). http://dx.doi.org/10.1038/s41598-020-77852-y.

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AbstractA microscopic viewpoint of structure and dipolar configurations in hybrid organic–inorganic perovskites is crucial to understanding their stability and phase transitions. The necessity of incorporating dispersion interactions in the state-of-the-art density functional theory for the $$CH_3NH_3PbI_3$$ C H 3 N H 3 P b I 3 perovskite (MAPI) is demonstrated in this work. Some of the vdW methods were selected to evaluate the corresponding energetics properties of the cubic MAPI with various azimuthally rotated MA organic cation orientations. The highest energy barrier obtained from PBEsol r
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10

Wang, Yimin, Qianqian Wu, Lin Wang, et al. "Boosting Efficiency and Stability of Green InP Quantum Dot Light-Emitting Diodes by Interface Dipole Modulation." Journal of Materials Chemistry C, 2022. http://dx.doi.org/10.1039/d2tc01522f.

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The interface states have significant effects on the optoelectronic properties of quantum dots-based light emitting diodes (QLEDs). Herein, we employed a dielectric interlayer, namely, phenylethylammonium bromide (PEABr): methylammonium bromine (MABr),...
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11

Shen, Yi, Linqu Luo, Yuxuan Zhang, et al. "High‐Performance Nanogap Photodetectors Based on 2D Halide Perovskites with a Novel Spacer Cation." Advanced Functional Materials, July 5, 2024. http://dx.doi.org/10.1002/adfm.202403746.

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Abstract2D Ruddlesden─Popper (RP) halide perovskites are attracting increasing research interest due to their enhanced stability compared to 3D perovskites. However, the quantum confinement effect of bulk organic spacers hinders the separation and transport of photo‐generated carriers. Here, a multiple aromatic ring spacer, 3‐benzothiophene methylammonium (BTMA), is developed for a new 2D RP perovskite. The BTMA spacer is demonstrated, with a significant dipole moment, can impair the influence of the quantum confinement effect, and the presence of S atoms or thiophene is favorable for enhancin
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12

Lee, Chang Min, Dong Hyun Choi, Amjad Islam, et al. "Improved device efficiency and lifetime of perovskite light-emitting diodes by size-controlled polyvinylpyrrolidone-capped gold nanoparticles with dipole formation." Scientific Reports 12, no. 1 (2022). http://dx.doi.org/10.1038/s41598-022-05935-z.

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AbstractHerein, an unprecedented report is presented on the incorporation of size-dependent gold nanoparticles (AuNPs) with polyvinylpyrrolidone (PVP) capping into a conventional hole transport layer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The hole transport layer blocks ion-diffusion/migration in methylammonium-lead-bromide (MAPbBr3)-based perovskite light-emitting diodes (PeLEDs) as a modified interlayer. The PVP-capped 90 nm AuNP device exhibited a seven-fold increase in efficiency (1.5%) as compared to the device without AuNPs (0.22%), where the device lifetim
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13

Junaid, Syed Bilal, Furqanul Hassan Naqvi, Jae-Hyeon Ko, et al. "Suppression of Phase Transition and Dipolar Glassy Behavior in Dimethylammonium/Methylammonium Lead Chloride Single Crystals." ACS Applied Energy Materials, June 23, 2025. https://doi.org/10.1021/acsaem.5c00786.

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14

Lin, Cheng-Chieh, Shing-Jong Huang, Pei-Hao Wu, et al. "Direct investigation of the reorientational dynamics of A-site cations in 2D organic-inorganic hybrid perovskite by solid-state NMR." Nature Communications 13, no. 1 (2022). http://dx.doi.org/10.1038/s41467-022-29207-6.

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AbstractLimited methods are available for investigating the reorientational dynamics of A-site cations in two-dimensional organic–inorganic hybrid perovskites (2D OIHPs), which play a pivotal role in determining their physical properties. Here, we describe an approach to study the dynamics of A-site cations using solid-state NMR and stable isotope labelling. 2H NMR of 2D OIHPs incorporating methyl-d3-ammonium cations (d3-MA) reveals the existence of multiple modes of reorientational motions of MA. Rotational-echo double resonance (REDOR) NMR of 2D OIHPs incorporating 15N- and ¹³C-labeled methy
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15

Guedes-Sobrinho, Diego, Danilo Neves Silveira, Luis O. de Araujo, et al. "Revealing the impact of organic spacers and cavity cations on quasi-2D perovskites via computational simulations." Scientific Reports 13, no. 1 (2023). http://dx.doi.org/10.1038/s41598-023-31220-8.

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AbstractTwo-dimensional hybrid lead iodide perovskites based on methylammonium (MA) cation and butylammonium (BA) organic spacer—such as $${\hbox {BA}_{2}\hbox {MA}_{n-1}\hbox {Pb}_{n}\hbox {I}_{3n+1}}$$ BA 2 MA n - 1 Pb n I 3 n + 1 —are one of the most explored 2D hybrid perovskites in recent years. Correlating the atomistic profile of these systems with their optoelectronic properties is a challenge for theoretical approaches. Here, we employed first-principles calculations via density functional theory to show how the cation partially canceled dipole moments through the $${{\hbox {NH}_{3}}^
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16

Valentina, M. Caselli, Fischer Mathias, Meggiolaro Daniele, et al. "Charge Carriers Are Not Affected by the Relatively Slow-Rotating Methylammonium Cations in Lead Halide Perovskite Thin Films." August 9, 2019. https://doi.org/10.1021/acs.jpclett.9b02160.

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Abstract: Recently, several studies have investigated dielectric properties as a possible origin of the exceptional optoelectronic properties of metal halide perovskites (MHPs). In this study we investigated the temperature-dependent dielectric behavior of different MHP films at different frequencies. In the gigahertz regime, dielectric losses in methylammonium-based samples are dominated by the rotational dynamics of the organic cation. Upon increasing the temperature from 160 to 300 K, the rotational relaxation time, τ, decreases from 400 (200) to 6 (1) ps for MAPb-I3 (-Br3). By con
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17

Ogunleye, Abdulazeez M., Hakseon Lee, Adeshina Mohammad Awwal, et al. "Inherent Lattice Distortion Engineering via Magnetic Field for High‐Quality Strained MAPbI3 Perovskite Single Crystals." Advanced Materials Interfaces, November 24, 2024. http://dx.doi.org/10.1002/admi.202400781.

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AbstractLattice distortion in perovskites (AMX3) significantly impacts their stability and power conversion efficiency, often in a trade‐off. The inherent lattice distortion is predominantly influenced by the size, orientation, and composition of the A‐site cations. Notably, organic–inorganic hybrid lead halide perovskites with organic cations like methylammonium (MA) and formamidinium (FA) demonstrate high power conversion efficiency but compromised stability. Here, a novel synthesis method is presented for high‐quality strained MAPbI3 single crystals that offers not only enhanced optoelectro
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18

Bourelle, Sean A., Xie Zhang, Sascha Feldmann, et al. "Energy Level Gradients from Surface to Bulk in Hybrid Metal-Halide Perovskite Thin Films." PRX Energy 3, no. 3 (2024). http://dx.doi.org/10.1103/prxenergy.3.033001.

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Variations in local strain, defect densities, and composition of hybrid metal-halide perovskites have been reported to create heterogeneous energy landscapes in thin films, which impact charge-carrier diffusion and recombination dynamics. Here, we employ one- and two-photon transient absorption spectroscopy to selectively probe the dynamics of charge carriers from surface and bulk regions of methylammonium lead bromide thin films. Differences in the transient absorption spectra indicate that an energy gradient of approximately 100 meV is formed between the higher band-gap surface and lower ban
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19

Lahnsteiner, Jonathan, Ryosuke Jinnouchi, and Menno Bokdam. "Long-range order imposed by short-range interactions in methylammonium lead iodide: Comparing point-dipole models to machine-learning force fields." Physical Review B 100, no. 9 (2019). http://dx.doi.org/10.1103/physrevb.100.094106.

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20

Wu, Tianhao, Telugu Bhim Raju, Juan Shang, et al. "Lattice Matching Anchoring of Hole‐Selective Molecule on Halide Perovskite Surfaces for n‐i‐p Solar Cells." Advanced Materials, November 27, 2024. http://dx.doi.org/10.1002/adma.202414576.

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AbstractExploiting the self‐assembled molecules (SAMs) as hole‐selective contacts has been an effective strategy to improve the efficiency and long‐term stability of perovskite solar cells (PSCs). Currently, research works are focusing on constructing SAMs on metal oxide surfaces in p‐i‐n PSCs, but realizing a stable and dense SAM contact on halide perovskite surfaces in n‐i‐p PSCs is still challenging. In this work, the hole‐selective molecule for n‐i‐p device is developed featuring a terephthalic methylammonium core structure that possesses double‐site anchoring ability and a matching diamet
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