Results 181 to 190 of about 2,713 (215)
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Steric Mixed‐Cation 2D Perovskite as a Methylammonium Locker to Stabilize MAPbI3
Angewandte Chemie, 2019AbstractThe reduced dimension perovskite including 2D perovskites are one of the most promising strategies to stabilize lead halide perovskite. A mixed‐cation 2D perovskite based on a steric phenyltrimethylammonium (PTA) cation is presented. The PTA‐MA mixed‐cation 2D perovskite of PTAMAPbI4 can be formed on the surface of MAPbI3 (PTAI‐MAPbI3) by ...
Xingtao Wang +4 more
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Crystal Research and Technology, 2016
A combined powder diffraction analysis using both synchrotron X‐ray and neutron diffraction data was used to determine the structure of methylammonium lead triiodide crystallizing at room temperature in the tetragonal crystal system. The use of rigid body modelling for the methylammonium molecule results in a description of the positions of the ...
Alexandra Franz +2 more
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A combined powder diffraction analysis using both synchrotron X‐ray and neutron diffraction data was used to determine the structure of methylammonium lead triiodide crystallizing at room temperature in the tetragonal crystal system. The use of rigid body modelling for the methylammonium molecule results in a description of the positions of the ...
Alexandra Franz +2 more
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Self-diffusion of methylammonium cations in the high-temperature solid phase of CH3NH3NO3
Journal of the Chemical Society, Faraday Transactions 2, 1985The high-temperature solid phase of CH3NH3NO3, which is stable above 352 K, has been studied by differential thermal analysis, differential scanning calorimetry, X-ray powder diffraction, 1H nuclear magnetic resonance spectroscopy and electrical-conductivity experiments. X-ray powder patterns taken at 370 K reveal that CH3NH3NO3 forms a CsCl-type b.c.c.
Hiroyuki Ishida +2 more
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Angewandte Chemie, 2019
AbstractTin‐based halide perovskite materials have been successfully employed in lead‐free perovskite solar cells, but the overall power conversion efficiencies (PCEs) have been limited by the high carrier concentration from the facile oxidation of Sn2+ to Sn4+. Now a chemical route is developed for fabrication of high‐quality methylammonium tin iodide
Fengzhu Li +11 more
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AbstractTin‐based halide perovskite materials have been successfully employed in lead‐free perovskite solar cells, but the overall power conversion efficiencies (PCEs) have been limited by the high carrier concentration from the facile oxidation of Sn2+ to Sn4+. Now a chemical route is developed for fabrication of high‐quality methylammonium tin iodide
Fengzhu Li +11 more
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Angewandte Chemie, 2017
AbstractMethylammonium‐mediated phase‐evolution behavior of FA1−xMAxPbI3 mixed‐organic‐cation perovskite (MOCP) is studied. It is found that by simply enriching the MOCP precursor solutions with excess methylammonium cations, the MOCPs form via a dynamic composition‐tuning process that is key to obtaining MOCP thin films with superior properties.
Chongwen Li +8 more
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AbstractMethylammonium‐mediated phase‐evolution behavior of FA1−xMAxPbI3 mixed‐organic‐cation perovskite (MOCP) is studied. It is found that by simply enriching the MOCP precursor solutions with excess methylammonium cations, the MOCPs form via a dynamic composition‐tuning process that is key to obtaining MOCP thin films with superior properties.
Chongwen Li +8 more
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Angewandte Chemie International Edition
AbstractThe performance and stability of organic metal halide perovskite (OMHP) optoelectronic devices have been associated with ion migration. Understanding of nanoscale resolved organic cation migration mechanism would facilitate structure engineering and commercialization of OMHP.
Jing Liang +4 more
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AbstractThe performance and stability of organic metal halide perovskite (OMHP) optoelectronic devices have been associated with ion migration. Understanding of nanoscale resolved organic cation migration mechanism would facilitate structure engineering and commercialization of OMHP.
Jing Liang +4 more
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The Journal of Physical Chemistry Letters, 2019
Herein, we reveal for the first time a comprehensive mechanism of poorly investigated electrochemical decomposition of CH3NH3PbI3 using a set of microscopy techniques (optical, AFM, PL) and ToF-SIMS. We demonstrate that applied electric bias induces the oxidation of I- to I2, which remains trapped in the film in the form of polyiodides, and hence, the ...
Olga R. Yamilova +9 more
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Herein, we reveal for the first time a comprehensive mechanism of poorly investigated electrochemical decomposition of CH3NH3PbI3 using a set of microscopy techniques (optical, AFM, PL) and ToF-SIMS. We demonstrate that applied electric bias induces the oxidation of I- to I2, which remains trapped in the film in the form of polyiodides, and hence, the ...
Olga R. Yamilova +9 more
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Advanced Functional Materials, 2018
AbstractSolution‐processed and low‐temperature Sn‐rich perovskites show their low bandgap of about 1.2 eV, enabling potential applications in next‐generation cost‐effective ultraviolet (UV)–visible (vis)–near infrared (NIR) photodetection. Particularly, the crystallization (crystallinity and orientation) and film (smooth and dense film) properties of ...
Hugh Lu Zhu +7 more
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AbstractSolution‐processed and low‐temperature Sn‐rich perovskites show their low bandgap of about 1.2 eV, enabling potential applications in next‐generation cost‐effective ultraviolet (UV)–visible (vis)–near infrared (NIR) photodetection. Particularly, the crystallization (crystallinity and orientation) and film (smooth and dense film) properties of ...
Hugh Lu Zhu +7 more
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Nano Research, 2017
We report the formation of high-quality Cs0.4MA0.6PbBr3 thin films with nearly full surface coverage and good emission properties upon the introduction of Cs+ into perovskite crystals. The Cs0.4MA0.6PbBr3 thin films were applied as emissive layers in light-emitting diodes.
Junjie Si +7 more
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We report the formation of high-quality Cs0.4MA0.6PbBr3 thin films with nearly full surface coverage and good emission properties upon the introduction of Cs+ into perovskite crystals. The Cs0.4MA0.6PbBr3 thin films were applied as emissive layers in light-emitting diodes.
Junjie Si +7 more
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Journal of the American Chemical Society
Formamidinium lead triiodide (FAPbI3) perovskite thin films are commonly deposited through a solution process, often incorporating a specific amount of methylammonium halide to stabilize the α-phase or enhance their crystallinity. The precursor solution for such coatings significantly influences the fabrication of perovskite solar cells (PSCs ...
Liang Chen +5 more
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Formamidinium lead triiodide (FAPbI3) perovskite thin films are commonly deposited through a solution process, often incorporating a specific amount of methylammonium halide to stabilize the α-phase or enhance their crystallinity. The precursor solution for such coatings significantly influences the fabrication of perovskite solar cells (PSCs ...
Liang Chen +5 more
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