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Annemarie Pucci - One of the best experts on this subject based on the ideXlab platform.

  • infrared spectroscopic study of vibrational modes in Methylammonium lead halide perovskites
    Journal of Physical Chemistry Letters, 2015
    Co-Authors: Tobias Glaser, Christian Muller, Michael Sendner, Christian Krekeler, Octavi E Semonin, Trevor D Hull, Omer Yaffe, Jonathan S Owen, Wolfgang Kowalsky, Annemarie Pucci
    Abstract:

    The organic cation and its interplay with the inorganic lattice underlie the exceptional optoelectronic properties of organo-metallic halide perovskites. Herein we report high-quality infrared spectroscopic measurements of Methylammonium lead halide perovskite (CH3NH3Pb(I/Br/Cl)3) films and single crystals at room temperature, from which the dielectric function in the investigated spectral range is derived. Comparison with electronic structure calculations in vacuum of the free Methylammonium cation allows for a detailed peak assignment. We analyze the shifts of the vibrational peak positions between the different halides and infer the extent of interaction between organic moiety and the surrounding inorganic cage. The positions of the NH3+ stretching vibrations point to significant hydrogen bonding between the Methylammonium and the halides for all three perovskites.

Henk J Bolink - One of the best experts on this subject based on the ideXlab platform.

Sang Il Seok - One of the best experts on this subject based on the ideXlab platform.

  • compositional engineering of perovskite materials for high performance solar cells
    Nature, 2015
    Co-Authors: Nam Joong Jeon, Woon Seok Yang, Sang Il Seok
    Abstract:

    Inorganic–organic lead halide perovskite could be efficient when used as the light-harvesting component of solar cells; here incorporation of Methylammonium lead bromide into formamidinium lead iodide stabilizes the perovskite and improves the power conversion efficiency of the solar cell up to 17.9 per cent. Inorganic–organic lead halide perovskites are currently attracting considerable interest for solar-cell applications. Most of the best performing perovskite solar cells to date have made use of Methylammonium-based perovskites; formamidinium-based perovskites have also shown promise, but are not as stable. Now Nam Joong Jeon and colleagues show that the formamidinium-based perovskites can be stabilized by the addition of some Methylammonium-based perovskite, and that solar cells incorporating the resulting compositionally tuned materials can reach new heights of efficiency. Of the many materials and methodologies aimed at producing low-cost, efficient photovoltaic cells, inorganic–organic lead halide perovskite materials1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17 appear particularly promising for next-generation solar devices owing to their high power conversion efficiency. The highest efficiencies reported for perovskite solar cells so far have been obtained mainly with Methylammonium lead halide materials1,2,3,4,5,6,7,8,9,10. Here we combine the promising—owing to its comparatively narrow bandgap—but relatively unstable formamidinium lead iodide (FAPbI3) with Methylammonium lead bromide (MAPbBr3) as the light-harvesting unit in a bilayer solar-cell architecture13. We investigated phase stability, morphology of the perovskite layer, hysteresis in current–voltage characteristics, and overall performance as a function of chemical composition. Our results show that incorporation of MAPbBr3 into FAPbI3 stabilizes the perovskite phase of FAPbI3 and improves the power conversion efficiency of the solar cell to more than 18 per cent under a standard illumination of 100 milliwatts per square centimetre. These findings further emphasize the versatility and performance potential of inorganic–organic lead halide perovskite materials for photovoltaic applications.

Hasan Uslu - One of the best experts on this subject based on the ideXlab platform.

  • Extraction of glycolic acid from aqueous solutions by trioctyl Methylammonium chloride and organic solvents
    Journal of Chemical & Engineering Data, 2005
    Co-Authors: İsmail İnci And, Hasan Uslu
    Abstract:

    The purpose of this study is to investigate the partitioning of glycolic acid from aqueous solutions by trioctyl Methylammonium chloride, also known as Aliquat 336. Extraction equilibria of glycolic acid in the solution of trioctyl Methylammonium chloride in mixtures of three individual diluting solvents and two solvent mixtures at a temperature of 298.15 K have been measured. The effect of initial acid concentration on the partitioning has been investigated. The solvents were propanol, cyclohexane, isooctane, butanol, toluene, methyl isobutyl ketone, and ethyl acetate. The distribution coefficients, D, loading factors, Z, and extraction efficiencies, E, are derived. The maximum removal of glycolic acid is 49% with propanol with a 1.76 mol·L-1 initial concentration of trioctyl Methylammonium chloride.

Samuel D Stranks - One of the best experts on this subject based on the ideXlab platform.