Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 44 , Issue 12
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  • Yuji Miyazaki, Shinichi Suzuki, Toru Kobayashi, Tsuyoshi Yaita, Yusuke ...
    2015 Volume 44 Issue 12 Pages 1626-1636
    Published: December 05, 2015
    Released: December 05, 2015
    [Advance publication] Released: October 20, 2015
    JOURNALS FREE ACCESS
    TPEN, N,N,N′,N′-tetrakis(2-pyridylmethyl)-1,2-ethylenediamine, recognized as a multidentate ligand with six nitrogen donors for coordination with various metal ions, is employed as an extracting agent for soft metal ions and trivalent minor actinides such as AmIII and CmIII. This review highlights the synthetic design of TPEN derivatives by introduction of peripheral substituents into the pyridine ring and modification of heteroaromatic ring structures for the purpose of improving the extraction performance.
    TPEN, N,N,N′,N′-tetrakis(2-pyridylmethyl)-1,2-ethylenediamine and recognized as a multidentate ligand with six nitrogen donors for coordination of various metal ions, is employed as an extracting agent for soft metal ions and minor actinides such as AmIII and CmIII. This review highlights synthetic design of the TPEN derivatives by introduction of peripheral substituents into the pyridine ring and modification of heteroaromatic ring structures for the purpose of improving the extraction performance. Fullsize Image
     
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  • Ludmila Cojocaru, Satoshi Uchida, Piyankarage V. V. Jayaweera, Shoji K ...
    2015 Volume 44 Issue 12 Pages 1750-1752
    Published: December 05, 2015
    Released: December 05, 2015
    [Advance publication] Released: October 22, 2015
    JOURNALS OPEN ACCESS
    For efficient hybrid solar cells based on organometal halide perovskites, the real origin of the IV hysteresis became a big issue and has been discussed widely. In this study, simulated IV curves of different equivalent circuit models were validated with experimental IV curves of a planar perovskite solar cell with the power conversion efficiency (PCE) of 18.0% and 8.8% on reverse scan (from open circuit to short circuit) and forward scan (from short circuit to open circuit), respectively. We found that an equivalent circuit model with a series of double diodes, capacitors, shunt resistances, and single series resistance produces simulated IV curves with large hysteresis matching with the experimentally observed curves. The electrical capacitances generated by defects due to the lattice mismatch at the TiO2/CH3NH3PbI3 and CH3NH3PbI3/spiro-OMeTAD interface are truly responsible for the hysteresis in perovskite solar cells.
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