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Fifth Generation Polyurethane Dendrimers Decorated with Protected Amine, Free Amine and Blocked Isocyanate End Groups: Synthesis and Electrolytic Performance to Increase the Efficiency of Dye‐Sensitized Solar Cell
Author(s) -
Ali Badusha Mohamad,
Kumar Kaliamurthy Ashok,
Sultan Nasar AbdulSalam
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201903289
Subject(s) - dendrimer , dye sensitized solar cell , polyurethane , isocyanate , amine gas treating , electrolyte , polymer chemistry , dynamic light scattering , materials science , end group , zeta potential , chemistry , electrode , organic chemistry , copolymer , nanoparticle , polymer , nanotechnology
Fifth generation polyurethane dendrimers decorated with trifluoroacetamide, free amine and blocked isocyanate end‐groups were prepared and their structures were confirmed using FT‐IR, 1 H and 19 F‐NMR, MALDI‐TOF MS and size exclusion chromatography (SEC‐MALS) techniques. The hydrodynamic diameter and zeta potential of dendrimers were measured using dynamic light scattering (DLS) technique; the later parameter indicated that the dendrimer containing trifluoroacetamide end‐group ( 1 ) stabilized more in the medium. The effect of different end‐groups on photophysical, electrochemical and thermal properties of dendrimers were also evaluated; dendrimer with blocked isocyanate end‐groups ( 3 ) absorbed low light, showed two redox potential and exhibited glass transition temperature (T g ). All the dendrimers were used as electrolytes in combination with LiI for N719 dye‐sensitized solar cells (DSSCs) and found that the DSSC fabricated with blocked isocyanate‐terminated dendrimer ( 3 ) yielded nearly 2.5 times high power conversion efficiency (ɳ=8.04% upon illumination with 0.5 sun intensity) compared to the cell fabricated with only LiI electrolyte.