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Iodine induced 1-D Lamellar Self Assembly in Organic Ionic Crystal for Solid State Dye Sensitized Solar Cell

Abstract

A novel saturated heterocyclic organic ionic crystal, pipyridinium iodide (PiHI) is synthesized by facile route and applied as solid electrolyte in Dye Sensitized Solar Cell (ss-DSSC). Upon addition of small quantity of iodine, PiHI self-assemble into 1D lamellar micro crystalline structure that shows anisotropic conductivity. The two-component PiHI were characterized by using electrochemical impedance spectroscopy, cyclic voltammetry, steady state voltammetry, FT-IR, and Raman spectroscopy. Wide angle X-ray diffraction (XRD) measurement confirm the presence of long range 1D lamellar channels that pave the way for diffusion of redox couple I-/I3-, which exhibit high anisotropic conductivity. The ionic conductivity for 1D aligned PiHI (with I2) perpendicular to the electrode, σ⊥ (15.46 mS.cm-1) is 1.5 times higher than aligned parallel to the electrode σ|| = 10.32 mS.cm-1. The ss-DSSC devices with these self-assembled ordered ionic crystals with the carbazole based sensitizer (SK1), achieved power conversion efficiency (PCE) of 4.2 % and 5.2% for ||al and ⊥ar arrangement. The reported PCE are better than that obtained from classical liquid electrolyte with SK1 sensitizers. The electron kinetics at various interfaces of ss-DSSCs devices were evaluated using Electrochemical Impedance Spectroscopy (EIS) measurements. Presence of saturated cyclic structure promote close packing through H-bonding and electrostatic interactions, which make ss-DSSC devices more stable up to 600 h under illumination of 1 sun.

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Publication details

The article was received on 17 Aug 2017, accepted on 13 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR06128E
Citation: Nanoscale, 2017, Accepted Manuscript
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    Iodine induced 1-D Lamellar Self Assembly in Organic Ionic Crystal for Solid State Dye Sensitized Solar Cell

    S. S. Soni, J. V. Vaghasiya, K. K. Sonigara, T. Beuvier and A. Gibaud, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06128E

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